com.trolltech.qt.gui
Class QPainter

java.lang.Object
  extended by com.trolltech.qt.QSignalEmitter
      extended by com.trolltech.qt.QtJambiObject
          extended by com.trolltech.qt.gui.QPainter
All Implemented Interfaces:
QtJambiInterface
Direct Known Subclasses:
QStylePainter

public class QPainter
extends QtJambiObject

The QPainter class performs low-level painting on widgets and other paint devices.

QPainter provides highly optimized functions to do most of the drawing GUI programs require. It can draw everything from simple lines to complex shapes like pies and chords. It can also draw aligned text and pixmaps. Normally, it draws in a "natural" coordinate system, but it can also do view and world transformation. QPainter can operate on any object that inherits the QPaintDevice class.

The common use of QPainter is inside a widget's paint event: Construct and customize (e.g. set the pen or the brush) the painter. Then draw. Remember to destroy the QPainter object after drawing. For example:

    void SimpleExampleWidget::paintEvent(QPaintEvent *)
    {
        QPainter painter(this);
        painter.setPen(Qt::blue);
        painter.setFont(QFont("Arial", 30));
        painter.drawText(rect(), Qt::AlignCenter, "Qt");
    }

The core functionality of QPainter is drawing, but the class also provide several functions that allows you to customize QPainter's settings and its rendering quality, and others that enable clipping. In addition you can control how different shapes are merged together by specifying the painter's composition mode.

The isActive function indicates whether the painter is active. A painter is activated by the begin function and the constructor that takes a QPaintDevice argument. The end function, and the destructor, deactivates it.

Together with the QPaintDevice and QPaintEngine classes, QPainter form the basis for Qt's paint system. QPainter is the class used to perform drawing operations. QPaintDevice represents a device that can be painted on using a QPainter. QPaintEngine provides the interface that the painter uses to draw onto different types of devices. If the painter is active, device returns the paint device on which the painter paints, and paintEngine returns the paint engine that the painter is currently operating on. For more information, see The Paint System documentation.

Sometimes it is desirable to make someone else paint on an unusual QPaintDevice. QPainter supports a static function to do this, setRedirected.

Warning: When the paintdevice is a widget, QPainter can only be used inside a paintEvent() function or in a function called by paintEvent(); that is unless the Qt::WA_PaintOutsidePaintEvent widget attribute is set. On Mac OS X and Windows, you can only paint in a paintEvent() function regardless of this attribute's setting.

Settings

There are several settings that you can customize to make QPainter draw according to your preferences:

Note that some of these settings mirror settings in some paint devices, e.g. QWidget::font(). The QPainter::begin() function (or equivalently the QPainter constructor) copies these attributes from the paint device.

You can at any time save the QPainter's state by calling the save function which saves all the available settings on an internal stack. The restore function pops them back.

Drawing

QPainter provides functions to draw most primitives: drawPoint, drawPoints, drawLine, drawRect, drawRoundRect, drawEllipse, drawArc, drawPie, drawChord, drawPolyline, drawPolygon, drawConvexPolygon and drawCubicBezier(). The two convenience functions, drawRects and drawLines, draw the given number of rectangles or lines in the given array of QRects or QLines using the current pen and brush.

The QPainter class also provides the fillRect function which fills the given QRect, with the given QBrush, and the eraseRect function that erases the area inside the given rectangle.

All of these functions have both integer and floating point versions.

Basic Drawing Example

The Basic Drawing example shows how to display basic graphics primitives in a variety of styles using the QPainter class.

If you need to draw a complex shape, especially if you need to do so repeatedly, consider creating a QPainterPath and drawing it using drawPath.

Painter Paths example

The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.

The Painter Paths example shows how painter paths can be used to build complex shapes for rendering.

QPainter also provides the fillPath function which fills the given QPainterPath with the given QBrush, and the strokePath function that draws the outline of the given path (i.e. strokes the path).

See also the Vector Deformation demo which shows how to use advanced vector techniques to draw text using a QPainterPath, the Gradients demo which shows the different types of gradients that are available in Qt, and the Path Stroking demo which shows Qt's built-in dash patterns and shows how custom patterns can be used to extend the range of available patterns.

Vector DeformationGradientsPath Stroking

There are functions to draw pixmaps/images, namely drawPixmap, drawImage and drawTiledPixmap. Both drawPixmap and drawImage produce the same result, except that drawPixmap is faster on-screen while drawImage may be faster on a QPrinter or other devices.

Text drawing is done using drawText. When you need fine-grained positioning, boundingRect tells you where a given drawText command will draw.

There is a drawPicture function that draws the contents of an entire QPicture. The drawPicture function is the only function that disregards all the painter's settings as QPicture has its own settings.

Rendering Quality

To get the optimal rendering result using QPainter, you should use the platform independent QImage as paint device; i.e. using QImage will ensure that the result has an identical pixel representation on any platform.

The QPainter class also provides a means of controlling the rendering quality through its RenderHint enum and the support for floating point precision: All the functions for drawing primitives has a floating point version. These are often used in combination with the QPainter::AntiAliasing render hint.

Concentric Circles Example

The Concentric Circles example shows the improved rendering quality that can be obtained using floating point precision and anti-aliasing when drawing custom widgets.

The application's main window displays several widgets which are drawn using the various combinations of precision and anti-aliasing.

The RenderHint enum specifies flags to QPainter that may or may not be respected by any given engine. QPainter::AntiAliasing indicates that the engine should antialias edges of primitives if possible, QPainter::TextAntialiasing indicates that the engine should antialias text if possible, and the QPainter::SmoothPixmapTransform indicates that the engine should use a smooth pixmap transformation algorithm. HighQualityAntialiasing is an OpenGL-specific rendering hint indicating that the engine should use fragment programs and offscreen rendering for antialiasing.

The renderHints function returns a flag that specifies the rendering hints that are set for this painter. Use the setRenderHint function to set or clear the currently set RenderHints.

Coordinate Transformations

Normally, the QPainter operates on the device's own coordinate system (usually pixels), but QPainter has good support for coordinate transformations.

noprotatescaletranslate

The most commonly used transformations are scaling, rotation, translation and shearing. Use the scale function to scale the coordinate system by a given offset, the rotate function to rotate it clockwise and translate to translate it (i.e. adding a given offset to the points). You can also twist the coordinate system around the origin using the shear function. See the Affine Transformations demo for a visualization of a sheared coordinate system.

See also the Transformations example which shows how transformations influence the way that QPainter renders graphics primitives. In particular it shows how the order of transformations affects the result.

Affine Transformations Demo

The Affine Transformations demo show Qt's ability to perform affine transformations on painting operations. The demo also allows the user to experiment with the transformation operations and see the results immediately.

All the tranformation operations operate on the transformation worldMatrix. A matrix transforms a point in the plane to another point. For more information about the transformation matrix, see the The Coordinate System and QMatrix documentation.

The setWorldMatrix function can replace or add to the currently set worldMatrix. The resetMatrix function resets any transformations that were made using translate, scale, shear, rotate, setWorldMatrix, setViewport and setWindow functions. The deviceMatrix returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device. The latter function is only needed when using platform painting commands on the platform dependent handle, and the platform does not do transformations nativly.

When drawing with QPainter, we specify points using logical coordinates which then are converted into the physical coordinates of the paint device. The mapping of the logical coordinates to the physical coordinates are handled by QPainter's combinedMatrix, a combination of viewport and window and worldMatrix. The viewport represents the physical coordinates specifying an arbitrary rectangle, the window describes the same rectangle in logical coordinates, and the worldMatrix is identical with the transformation matrix.

See also The Coordinate System documentation.

Clipping

QPainter can clip any drawing operation to a rectangle, a region, or a vector path. The current clip is available using the functions clipRegion and clipPath. Whether paths or regions are preferred (faster) depends on the underlying paintEngine. For example, the QImage paint engine prefers paths while the X11 paint engine prefers regions. Setting a clip is done in the painters logical coordinates.

After QPainter's clipping, the paint device may also clip. For example, most widgets clip away the pixels used by child widgets, and most printers clip away an area near the edges of the paper. This additional clipping is not reflected by the return value of clipRegion or hasClipping.

Composition Modes

QPainter provides the CompositionMode enum which defines the Porter-Duff rules for digital image compositing; it describes a model for combining the pixels in one image, the source, with the pixels in another image, the destination.

The two most common forms of composition are Source and SourceOver. Source is used to draw opaque objects onto a paint device. In this mode, each pixel in the source replaces the corresponding pixel in the destination. In SourceOver composition mode, the source object is transparent and is drawn on top of the destination.

Note that composition transformation operates pixelwise. For that reason, there is a difference between using the grahic primitive itself and its bounding rectangle: The bounding rect contains pixels with alpha == 0 (i.e the pixels surrounding the primitive). These pixels will overwrite the other image's pixels, affectively clearing those, while the primitive only overwrites its own area.

Composition Modes Demo

The Composition Modes demo, available in Qt's demo directory, allows you to experiment with the various composition modes and see the results immediately.

See Also:
QPaintDevice, QPaintEngine, QtSvg Module, Drawing Example

Nested Class Summary
static class QPainter.CompositionMode
          Defines the Porter-Duff rules for digital image compositing.
static class QPainter.RenderHint
          Renderhints are used to specify flags to QPainter that may or may not be respected by any given engine.
static class QPainter.RenderHints
          This QFlag class provides flags for the int enum.
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I>
 
Constructor Summary
QPainter()
          Constructs a painter.
QPainter(QPaintDeviceInterface arg__1)
          Constructs a painter that begins painting the paint arg__1 immediately.
QPainter(QWidget widget)
          Creates a QPainter with parent widget.
 
Method Summary
 QBrush background()
          Returns the current background brush.
 Qt.BGMode backgroundMode()
          Returns the current background mode.
 boolean begin(QPaintDeviceInterface arg__1)
          Begins painting the paint arg__1 and returns true if successful; otherwise returns false.
 boolean begin(QWidget widget)
          This method initializes the painter to draw on widget.
 QRect boundingRect(int x, int y, int w, int h, int flags, java.lang.String text)
          Returns the bounding rectangle of the given text as it will appear when drawn inside the rectangle beginning at the point (x, y) with width w and height h.
 QRectF boundingRect(QRectF rect, int flags, java.lang.String text)
          Returns the bounding rectangle of the text as it will appear when drawn inside the given rect with the specified flags using the currently set font; i.e the function tells you where the drawText function will draw when given the same arguments.
 QRectF boundingRect(QRectF rect, java.lang.String text)
          Equivalent to boundingRect(rect, text, QTextOption()).
 QRectF boundingRect(QRectF rect, java.lang.String text, QTextOption o)
          Instead of specifying flags as a bitwise OR of the Qt::AlignmentFlag and Qt::TextFlag, this overloaded function takes an o argument.
 QRect boundingRect(QRect rect, int flags, java.lang.String text)
          Returns the bounding rectangle of the text as it will appear when drawn inside the given rect with the specified flags using the currently set font.
 QBrush brush()
          Returns the painter's current brush.
 QPoint brushOrigin()
          Returns the currently set brush origin.
 QPainterPath clipPath()
          Returns the currently clip as a path.
 QRegion clipRegion()
          Returns the currently set clip region.
 QMatrix combinedMatrix()
          Returns the transformation matrix combining the current window/viewport and world transformation.
 QTransform combinedTransform()
          Returns the transformation matrix combining the current window/viewport and world transformation.
 QPainter.CompositionMode compositionMode()
          Returns the current composition mode.
 QPaintDeviceInterface device()
          Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.
 QMatrix deviceMatrix()
          Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.
 QTransform deviceTransform()
          Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.
 void drawArc(int x, int y, int w, int h, int a, int alen)
          Draws the arc defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.
 void drawArc(QRectF rect, int a, int alen)
          Draws the arc defined by the given rect, a and alen.
 void drawArc(QRect arg__1, int a, int alen)
          Draws the arc defined by the given arg__1, a and alen.
 void drawChord(int x, int y, int w, int h, int a, int alen)
          Draws the chord defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.
 void drawChord(QRectF rect, int a, int alen)
          Draws the chord defined by the given rect, a and alen.
 void drawChord(QRect arg__1, int a, int alen)
          Draws the chord defined by the given arg__1, a and alen.
 void drawConvexPolygon(QPolygon polygon)
          Draws the convex polygon defined by polygon using the current pen and brush.
 void drawConvexPolygon(QPolygonF polygon)
          Draws the convex polygon defined by polygon using the current pen and brush.
 void drawEllipse(int x, int y, int w, int h)
          Draws the ellipse defined by the rectangle beginning at (x, y) with the given w and h.
 void drawEllipse(QRect r)
          Draws the ellipse defined by the given r.
 void drawEllipse(QRectF r)
          Draws the ellipse defined by the given r.
 void drawImage(int x, int y, QImage image)
          Equivalent to drawImage(x, y, image, 0, 0, -1, -1, Qt::AutoColor).
 void drawImage(int x, int y, QImage image, int sx)
          Equivalent to drawImage(x, y, image, sx, 0, -1, -1, Qt::AutoColor).
 void drawImage(int x, int y, QImage image, int sx, int sy)
          Equivalent to drawImage(x, y, image, sx, sy, -1, -1, Qt::AutoColor).
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw)
          Equivalent to drawImage(x, y, image, sx, sy, sw, -1, Qt::AutoColor).
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh)
          Equivalent to drawImage(x, y, image, sx, sy, sw, sh, Qt::AutoColor).
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh, Qt.ImageConversionFlag... flags)
          Draws an image at (x, y) by copying a part of image into the paint device.
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh, Qt.ImageConversionFlags flags)
          Draws an image at (x, y) by copying a part of image into the paint device.
 void drawImage(QPointF p, QImage image)
          Draws the given image at the given p.
 void drawImage(QPointF p, QImage image, QRectF sr)
          Equivalent to drawImage(p, image, sr, Qt::AutoColor).
 void drawImage(QPointF p, QImage image, QRectF sr, Qt.ImageConversionFlag... flags)
          Draws the rectangular portion sr of the given image with its origin at the given p.
 void drawImage(QPointF p, QImage image, QRectF sr, Qt.ImageConversionFlags flags)
          Draws the rectangular portion sr of the given image with its origin at the given p.
 void drawImage(QPoint p, QImage image)
          Draws the given image at the given p.
 void drawImage(QPoint p, QImage image, QRect sr)
          Equivalent to drawImage(p, image, sr, Qt::AutoColor).
 void drawImage(QPoint p, QImage image, QRect sr, Qt.ImageConversionFlag... flags)
          Draws the rectangular portion sr of the given image with its origin at the given p.
 void drawImage(QPoint p, QImage image, QRect sr, Qt.ImageConversionFlags flags)
          Draws the rectangular portion sr of the given image with its origin at the given p.
 void drawImage(QRectF r, QImage image)
          Draws the given image into the given r.
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect)
          Equivalent to drawImage(targetRect, image, sourceRect, Qt::AutoColor).
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect, Qt.ImageConversionFlag... flags)
          Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect, Qt.ImageConversionFlags flags)
          Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.
 void drawImage(QRect r, QImage image)
          Draws the given image into the given r.
 void drawImage(QRect targetRect, QImage image, QRect sourceRect)
          Equivalent to drawImage(targetRect, image, sourceRect, Qt::AutoColor).
 void drawImage(QRect targetRect, QImage image, QRect sourceRect, Qt.ImageConversionFlag... flags)
          Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.
 void drawImage(QRect targetRect, QImage image, QRect sourceRect, Qt.ImageConversionFlags flags)
          Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.
 void drawLine(int x1, int y1, int x2, int y2)
          Draws a line from (x1, y1) to (x2, y2) and sets the current pen position to (x2, y2).
 void drawLine(QLine line)
          Draws a line defined by line.
 void drawLine(QLineF line)
          Draws a line defined by line.
 void drawLine(QPointF p1, QPointF p2)
          Draws a line from p1 to p2.
 void drawLine(QPoint p1, QPoint p2)
          Draws a line from p1 to p2.
 void drawLines(java.util.List<QLine> lines)
          Draws the set of lines defined by the list lines using the current pen and brush.
 void drawLinesF(java.util.List<QLineF> lines)
          Draws the set of lines defined by the list lines using the current pen and brush.
 void drawLinesFromPoints(java.util.List<QPoint> pointPairs)
          Draws a line for each pair of points in the vector pointPairs using the current pen.
 void drawLinesFromPointsF(java.util.List<QPointF> pointPairs)
          Draws a line for each pair of points in the vector pointPairs using the current pen.
 void drawPath(QPainterPath path)
          Draws the given painter path using the current pen for outline and the current brush for filling.
 void drawPicture(int x, int y, QPicture picture)
          Draws the given picture at point (x, y).
 void drawPicture(QPointF p, QPicture picture)
          Replays the given picture at the given p.
 void drawPicture(QPoint p, QPicture picture)
          Replays the given picture at the given p.
 void drawPie(int x, int y, int w, int h, int a, int alen)
          Draws the pie defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.
 void drawPie(QRectF rect, int a, int alen)
          Draws a pie defined by the given rect, a and and alen.
 void drawPie(QRect arg__1, int a, int alen)
          Draws a pie defined by the given arg__1, a and and alen.
 void drawPixmap(int x, int y, int w, int h, QPixmap pm)
          Draws the pm into the rectangle at position (x, y) with the given w and h.
 void drawPixmap(int x, int y, int w, int h, QPixmap pm, int sx, int sy, int sw, int sh)
          Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the given pm , at the point (x, y), with a width of w and a height of h.
 void drawPixmap(int x, int y, QPixmap pm)
          Draws the given pm at position (x, y).
 void drawPixmap(int x, int y, QPixmap pm, int sx, int sy, int sw, int sh)
          Draws a pixmap at (x, y) by copying a part of the given pm into the paint device.
 void drawPixmap(QPointF p, QPixmap pm)
          Draws the given pm with its origin at the given p.
 void drawPixmap(QPointF p, QPixmap pm, QRectF sr)
          Draws the rectangular portion sr of the given pm with its origin at the given p.
 void drawPixmap(QPoint p, QPixmap pm)
          Draws the given pm with its origin at the given p.
 void drawPixmap(QPoint p, QPixmap pm, QRect sr)
          Draws the rectangular portion sr of the given pm with its origin at the given p.
 void drawPixmap(QRectF targetRect, QPixmap pixmap, QRectF sourceRect)
          Draws the rectangular portion sourceRect of the given pixmap into the given targetRect in the paint device.
 void drawPixmap(QRect r, QPixmap pm)
          Draws the given pm into the given r.
 void drawPixmap(QRect targetRect, QPixmap pixmap, QRect sourceRect)
          Draws the rectangular portion sourceRect of the given pixmap into the given targetRect in the paint device.
 void drawPoint(int x, int y)
          Draws a single point at position (x, y).
 void drawPoint(QPoint p)
          Draws a single point at the given p using the current pen's color.
 void drawPoint(QPointF pt)
          Draws a single point at the given pt using the current pen's color.
 void drawPoints(QPolygon points)
          Draws the points in the vector points.
 void drawPoints(QPolygonF points)
          Draws the points in the vector points.
 void drawPolygon(QPolygon polygon)
          Equivalent to drawPolygon(polygon, Qt::OddEvenFill).
 void drawPolygon(QPolygonF polygon)
          Equivalent to drawPolygon(polygon, Qt::OddEvenFill).
 void drawPolygon(QPolygonF polygon, Qt.FillRule fillRule)
          Draws the polygon defined by the given polygon using the fill rule fillRule.
 void drawPolygon(QPolygon polygon, Qt.FillRule fillRule)
          Draws the polygon defined by the given polygon using the fill rule fillRule.
 void drawPolyline(QPolygon polygon)
          Draws the polyline defined by the given polygon using the current pen.
 void drawPolyline(QPolygonF polyline)
          Draws the polyline defined by the given polyline using the current pen.
 void drawRect(int x1, int y1, int w, int h)
          Draws a rectangle with upper left corner at (x1, y1) and with the given w and h.
 void drawRect(QRect rect)
          Draws the current rect with the current pen and brush.
 void drawRect(QRectF rect)
          Draws the current rect with the current pen and brush.
 void drawRects(java.util.List<QRect> rectangles)
          Draws the given rectangles using the current pen and brush.
 void drawRectsF(java.util.List<QRectF> rectangles)
          Draws the given rectangles using the current pen and brush.
 void drawRoundRect(int x, int y, int w, int h)
          Equivalent to drawRoundRect(x, y, w, h, 25, 25).
 void drawRoundRect(int x, int y, int w, int h, int arg__5)
          Equivalent to drawRoundRect(x, y, w, h, arg__5, 25).
 void drawRoundRect(int x, int y, int w, int h, int arg__5, int arg__6)
          Draws the rectangle x, y, w, h with rounded corners.
 void drawRoundRect(QRect r)
          Equivalent to drawRoundRect(r, 25, 25).
 void drawRoundRect(QRectF r)
          Equivalent to drawRoundRect(r, 25, 25).
 void drawRoundRect(QRectF r, int xround)
          Equivalent to drawRoundRect(r, xround, 25).
 void drawRoundRect(QRectF r, int xround, int yround)
          Draws a rectangle r with rounded corners.
 void drawRoundRect(QRect r, int xround)
          Equivalent to drawRoundRect(r, xround, 25).
 void drawRoundRect(QRect r, int xround, int yround)
          Draws the rectangle r with rounded corners.
 void drawText(int x, int y, int width, int height, int flags, java.lang.String text)
          This is an overloaded method provided for convenience.
 void drawText(int x, int y, int width, int height, int flags, java.lang.String text, QRect boundingRect)
          Draws the given text within the rectangle with origin (x, y), width and height.
 void drawText(int x, int y, java.lang.String s)
          Draws the given s at position (x, y), using the painter's currently defined text direction.
 void drawText(QPointF p, java.lang.String s)
          Draws the given s with the currently defined text direction, beginning at the given p.
 void drawText(QPoint p, java.lang.String s)
          Draws the given s with the currently defined text direction, beginning at the given p.
 void drawText(QRectF rectangle, int flags, java.lang.String text)
          This is an overloaded method provided for convenience.
 void drawText(QRectF rectangle, int flags, java.lang.String text, QRectF boundingRect)
          Draws the given text within the provided rectangle.
 void drawText(QRectF r, java.lang.String text)
          Equivalent to drawText(r, text, QTextOption()).
 void drawText(QRectF r, java.lang.String text, QTextOption o)
          Draws the given text in the r specified using the o to control its positioning and orientation.
 void drawText(QRect rectangle, int flags, java.lang.String text)
          This is an overloaded function provided for convenience.
 void drawText(QRect rectangle, int flags, java.lang.String text, QRect boundingRect)
          Draws the given text within the provided rectangle.
 void drawTextItem(int x, int y, QTextItem ti)
          This method is used internally by Qt Jambi.
 void drawTextItem(QPointF p, QTextItem ti)
          This method is used internally by Qt Jambi.
 void drawTextItem(QPoint p, QTextItem ti)
          This method is used internally by Qt Jambi.
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5)
          Equivalent to drawTiledPixmap(x, y, w, h, arg__5, 0, 0).
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5, int sx)
          Equivalent to drawTiledPixmap(x, y, w, h, arg__5, sx, 0).
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5, int sx, int sy)
          Draws a tiled arg__5 in the specified rectangle.
 void drawTiledPixmap(QRectF rect, QPixmap pm)
          Equivalent to drawTiledPixmap(rect, pm, QPointF()).
 void drawTiledPixmap(QRectF rect, QPixmap pm, QPointF offset)
          Draws a tiled pm, inside the given rect with its origin at the given offset.
 void drawTiledPixmap(QRect arg__1, QPixmap arg__2)
          Equivalent to drawTiledPixmap(arg__1, arg__2, QPoint()).
 void drawTiledPixmap(QRect arg__1, QPixmap arg__2, QPoint arg__3)
          Draws a tiled arg__2, inside the given arg__1 with its origin at the given arg__3.
 boolean end()
          Ends painting.
 void eraseRect(int x, int y, int w, int h)
          Erases the area inside the rectangle beginning at (x, y) with the given w and h.
 void eraseRect(QRect arg__1)
          Erases the area inside the given arg__1.
 void eraseRect(QRectF arg__1)
          Erases the area inside the given arg__1.
 void fillPath(QPainterPath path, QBrush brush)
          Fills the given path using the given brush.
 void fillRect(int x, int y, int w, int h, QBrush arg__5)
          Fills the rectangle beginning at (x, y) with the given w and h, using the given arg__5.
 void fillRect(QRectF arg__1, QBrush arg__2)
          Fills the given arg__1 with the given arg__2.
 void fillRect(QRect arg__1, QBrush arg__2)
          Fills the given arg__1 with the given arg__2.
 QFont font()
          Returns the currently set font used for drawing text.
 QFontInfo fontInfo()
          Returns the font info for the painter if the painter is active.
 QFontMetrics fontMetrics()
          Returns the font metrics for the painter if the painter is active.
static QPainter fromNativePointer(QNativePointer nativePointer)
          This function returns the QPainter instance pointed to by nativePointer
 boolean hasClipping()
          Returns true if clipping has been set; otherwise returns false.
 void initFrom(QWidget widget)
          Initializes the painters pen, background and font to the same as the given widget.
 boolean isActive()
          Returns true if begin has been called and end has not yet been called; otherwise returns false.
 Qt.LayoutDirection layoutDirection()
          Returns the layout direction used by the painter when drawing text.
 double opacity()
          Returns the opacity of the painter.
 QPaintEngine paintEngine()
          Returns the paint engine that the painter is currently operating on if the painter is active; otherwise 0.
 QPen pen()
          Returns the painter's current pen.
static QPaintDeviceInterface redirected(QPaintDeviceInterface device, QPoint offset)
          Returns the replacement for given device.
 QPainter.RenderHints renderHints()
          Returns a flag that specifies the rendering hints that are set for this painter.
 void resetMatrix()
          Resets any transformations that were made using translate, scale, shear, rotate, setWorldMatrix, setViewport and setWindow.
 void resetTransform()
          Resets any transformations that were made using translate, scale, shear, rotate, setWorldTransform, setViewport and setWindow.
 void restore()
          Restores the current painter state (pops a saved state off the stack).
static void restoreRedirected(QPaintDeviceInterface device)
          Restores the previous redirection for the given device after a call to setRedirected.
 void rotate(double a)
          Rotates the coordinate system the given a clockwise.
 void save()
          Saves the current painter state (pushes the state onto a stack).
 void scale(double sx, double sy)
          Scales the coordinate system by (sx, sy).
 void setBackground(QBrush bg)
          Sets the background brush of the painter to the given bg.
 void setBackgroundMode(Qt.BGMode mode)
          Sets the background mode of the painter to the given mode
 void setBrush(QBrush brush)
          Sets the painter's brush to the given brush.
 void setBrush(QColor color)
          Sets the brush of this QPainter to a solid color brush.
 void setBrush(QGradient gradient)
          Sets this QPainter's brush to use gradient.
 void setBrush(QPixmap pm)
          Sets this QPainter's brush to use pm.
 void setBrush(Qt.BrushStyle style)
          Sets the painter's brush to black color and the specified style.
 void setBrushOrigin(int x, int y)
          Sets the brush's origin to point (x, y).
 void setBrushOrigin(QPoint arg__1)
          Sets the brush's origin to the given arg__1.
 void setBrushOrigin(QPointF arg__1)
          Sets the brush origin to arg__1.
 void setClipPath(QPainterPath path)
          Equivalent to setClipPath(path, Qt::ReplaceClip).
 void setClipPath(QPainterPath path, Qt.ClipOperation op)
          Enables clipping, and sets the clip path for the painter to the given path, with the clip op.
 void setClipping(boolean enable)
          Enables clipping if enable is true, or disables clipping if enable is false.
 void setClipRect(int x, int y, int w, int h)
          Equivalent to setClipRect(x, y, w, h, Qt::ReplaceClip).
 void setClipRect(int x, int y, int w, int h, Qt.ClipOperation op)
          Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given w and h.
 void setClipRect(QRect arg__1)
          Equivalent to setClipRect(arg__1, Qt::ReplaceClip).
 void setClipRect(QRectF arg__1)
          Equivalent to setClipRect(arg__1, Qt::ReplaceClip).
 void setClipRect(QRectF arg__1, Qt.ClipOperation op)
          Enables clipping, and sets the clip region to the given arg__1 using the given clip op.
 void setClipRect(QRect arg__1, Qt.ClipOperation op)
          Enables clipping, and sets the clip region to the given arg__1 using the given clip op.
 void setClipRegion(QRegion arg__1)
          Equivalent to setClipRegion(arg__1, Qt::ReplaceClip).
 void setClipRegion(QRegion arg__1, Qt.ClipOperation op)
          Sets the clip region to the given arg__1 using the specified clip op.
 void setCompositionMode(QPainter.CompositionMode mode)
          Sets the composition mode to the given mode.
 void setFont(QFont f)
          Sets the painter's font to the given f.
 void setLayoutDirection(Qt.LayoutDirection direction)
          Sets the layout direction used by the painter when drawing text, to the specified direction.
 void setOpacity(double opacity)
          Sets the opacity of the painter to opacity.
 void setPen(QColor color)
          Sets the painter's pen to have style Qt::SolidLine, width 0 and the specified color.
 void setPen(QPen pen)
          Sets the painter's pen to be the given pen.
 void setPen(Qt.PenStyle style)
          Sets the painter's pen to have the given style, width 0 and black color.
static void setRedirected(QPaintDeviceInterface device, QPaintDeviceInterface replacement)
          Equivalent to setRedirected(device, replacement, QPoint()).
static void setRedirected(QPaintDeviceInterface device, QPaintDeviceInterface replacement, QPoint offset)
          Redirects all paint commands for the given paint device, to the replacement device.
 void setRenderHint(QPainter.RenderHint hint)
          Equivalent to setRenderHint(hint, true).
 void setRenderHint(QPainter.RenderHint hint, boolean on)
          Sets the given render hint on the painter if on is true; otherwise clears the render hint.
 void setRenderHints(QPainter.RenderHints hints)
          Equivalent to setRenderHints(hints, true).
 void setRenderHints(QPainter.RenderHints hints, boolean on)
          Sets the given render hints on the painter if on is true; otherwise clears the render hints.
 void setTransform(QTransform transform)
          Equivalent to setTransform(transform, false).
 void setTransform(QTransform transform, boolean combine)
          Sets the world transformation matrix.
 void setViewport(int x, int y, int w, int h)
          Sets the painter's viewport rectangle to be the rectangle beginning at (x, y) with the given w and h.
 void setViewport(QRect viewport)
          Sets the painter's viewport rectangle to the given viewport, and enables view transformations.
 void setViewTransformEnabled(boolean enable)
          Enables view transformations if enable is true, or disables view transformations if enable is false.
 void setWindow(int x, int y, int w, int h)
          Sets the painter's window to the rectangle beginning at (x, y) and the given w and h.
 void setWindow(QRect window)
          Sets the painter's window to the given window, and enables view transformations.
 void setWorldMatrix(QMatrix matrix)
          Equivalent to setWorldMatrix(matrix, false).
 void setWorldMatrix(QMatrix matrix, boolean combine)
          Sets the transformation matrix to matrix and enables transformations.
 void setWorldMatrixEnabled(boolean enabled)
          Enables transformations if enabled is true, or disables transformations if enabled is false.
 void setWorldTransform(QTransform matrix)
          Equivalent to setWorldTransform(matrix, false).
 void setWorldTransform(QTransform matrix, boolean combine)
          Sets the world transformation matrix.
 void shear(double sh, double sv)
          Shears the coordinate system by (sh, sv).
 void strokePath(QPainterPath path, QPen pen)
          Draws the outline (strokes) the path path with the pen specified by pen
 boolean testRenderHint(QPainter.RenderHint hint)
          Returns true if hint is set; otherwise returns false.
 QTransform transform()
          Returns the world transformation matrix.
 void translate(double dx, double dy)
          Translates the coordinate system by the vector (dx, dy).
 void translate(QPoint offset)
          Translates the coordinate system by the given offset.
 void translate(QPointF offset)
          Translates the coordinate system by the given offset; i.e. the given offset is added to points.
 QRect viewport()
          Returns the viewport rectangle.
 boolean viewTransformEnabled()
          Returns true if view transformation is enabled; otherwise returns false.
 QRect window()
          Returns the window rectangle.
 QMatrix worldMatrix()
          Returns the world transformation matrix.
 boolean worldMatrixEnabled()
          Returns true if world transformation is enabled; otherwise returns false.
 QTransform worldTransform()
          Returns the world transformation matrix.
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Constructor Detail

QPainter

public QPainter()

Constructs a painter.

See Also:
begin, end

QPainter

public QPainter(QPaintDeviceInterface arg__1)

Constructs a painter that begins painting the paint arg__1 immediately.

This constructor is convenient for short-lived painters, e.g. in a QWidget::paintEvent() and should be used only once. The constructor calls begin for you and the QPainter destructor automatically calls end.

Here's an example using begin and end:

    void MyWidget::paintEvent(QPaintEvent *)
    {
        QPainter p;
        p.begin(this);
        p.drawLine(...);        // drawing code
        p.end();
    }

The same example using this constructor:

    void MyWidget::paintEvent(QPaintEvent *)
    {
        QPainter p(this);
        p.drawLine(...);        // drawing code
    }

Since the constructor cannot provide feedback when the initialization of the painter failed you should rather use begin and end to paint on external devices, e.g. printers.

See Also:
begin, end

QPainter

public QPainter(QWidget widget)
Creates a QPainter with parent widget.

Method Detail

background

public final QBrush background()

Returns the current background brush.

See Also:
setBackground, Settings

backgroundMode

public final Qt.BGMode backgroundMode()

Returns the current background mode.

See Also:
setBackgroundMode, Settings

begin

public final boolean begin(QPaintDeviceInterface arg__1)

Begins painting the paint arg__1 and returns true if successful; otherwise returns false.

Notice that all painter settings (setPen, setBrush etc.) are reset to default values when begin is called.

The errors that can occur are serious problems, such as these:

    painter->begin(0); // impossible - paint device cannot be 0

    QPixmap image(0, 0);
    painter->begin(&image); // impossible - image.isNull() == true;

    painter->begin(myWidget);
    painter2->begin(myWidget); // impossible - only one painter at a time

Note that most of the time, you can use one of the constructors instead of begin, and that end is automatically done at destruction.

Warning: A paint device can only be painted by one painter at a time.

See Also:
end, QPainter

boundingRect

public final QRectF boundingRect(QRectF rect,
                                 java.lang.String text)

Equivalent to boundingRect(rect, text, QTextOption()).


boundingRect

public final QRectF boundingRect(QRectF rect,
                                 java.lang.String text,
                                 QTextOption o)

Instead of specifying flags as a bitwise OR of the Qt::AlignmentFlag and Qt::TextFlag, this overloaded function takes an o argument. The QTextOption class provides a description of general rich text properties.

See Also:
QTextOption

boundingRect

public final QRect boundingRect(QRect rect,
                                int flags,
                                java.lang.String text)

Returns the bounding rectangle of the text as it will appear when drawn inside the given rect with the specified flags using the currently set font.


boundingRect

public final QRectF boundingRect(QRectF rect,
                                 int flags,
                                 java.lang.String text)

Returns the bounding rectangle of the text as it will appear when drawn inside the given rect with the specified flags using the currently set font; i.e the function tells you where the drawText function will draw when given the same arguments.

If the text does not fit within the given rect using the specified flags, the function returns the required rectangle.

The flags argument is a bitwise OR of the following flags:

If several of the horizontal or several of the vertical alignment flags are set, the resulting alignment is undefined.

See Also:
drawText, Qt::Alignment, Qt::TextFlag

boundingRect

public final QRect boundingRect(int x,
                                int y,
                                int w,
                                int h,
                                int flags,
                                java.lang.String text)

Returns the bounding rectangle of the given text as it will appear when drawn inside the rectangle beginning at the point (x, y) with width w and height h.


brush

public final QBrush brush()

Returns the painter's current brush.

See Also:
QPainter::setBrush, Settings

brushOrigin

public final QPoint brushOrigin()

Returns the currently set brush origin.

See Also:
setBrushOrigin, Settings

clipPath

public final QPainterPath clipPath()

Returns the currently clip as a path. Note that the clip path is given in logical coordinates.

See Also:
setClipPath, clipRegion, setClipping

clipRegion

public final QRegion clipRegion()

Returns the currently set clip region. Note that the clip region is given in logical coordinates.

See Also:
setClipRegion, clipPath, setClipping

combinedMatrix

public final QMatrix combinedMatrix()

Returns the transformation matrix combining the current window/viewport and world transformation.

It is advisable to use combinedTransform instead of this function to preserve the properties of perspective transformations.

See Also:
setWorldMatrix, setWindow, setViewport

combinedTransform

public final QTransform combinedTransform()

Returns the transformation matrix combining the current window/viewport and world transformation.

It is advisable to use combinedTransform instead of this function to preserve the properties of perspective transformations.

See Also:
setWorldMatrix, setWindow, setViewport

compositionMode

public final QPainter.CompositionMode compositionMode()

Returns the current composition mode.

See Also:
CompositionMode, setCompositionMode

device

public final QPaintDeviceInterface device()

Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.

See Also:
isActive

deviceMatrix

public final QMatrix deviceMatrix()

Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

Note: It is advisable to use deviceTransform instead of this function to preserve the properties of perspective transformations.

This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

See Also:
worldMatrix, QPaintEngine::hasFeature

deviceTransform

public final QTransform deviceTransform()

Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

See Also:
worldTransform, QPaintEngine::hasFeature

drawArc

public final void drawArc(QRectF rect,
                          int a,
                          int alen)

Draws the arc defined by the given rect, a and alen.

The a and alen must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    int startAngle = 30 * 16;
    int spanAngle = 120 * 16;

    QPainter painter(this);
    painter.drawArc(rectangle, startAngle, spanAngle);

See Also:
drawPie, drawChord, The Coordinate System

drawArc

public final void drawArc(int x,
                          int y,
                          int w,
                          int h,
                          int a,
                          int alen)

Draws the arc defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.


drawArc

public final void drawArc(QRect arg__1,
                          int a,
                          int alen)

Draws the arc defined by the given arg__1, a and alen.


drawChord

public final void drawChord(int x,
                            int y,
                            int w,
                            int h,
                            int a,
                            int alen)

Draws the chord defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.


drawChord

public final void drawChord(QRect arg__1,
                            int a,
                            int alen)

Draws the chord defined by the given arg__1, a and alen.


drawChord

public final void drawChord(QRectF rect,
                            int a,
                            int alen)

Draws the chord defined by the given rect, a and alen. The chord is filled with the current brush.

The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    int startAngle = 30 * 16;
    int spanAngle = 120 * 16;

    QPainter painter(this);
    painter.drawChord(rect, startAngle, spanAngle);

See Also:
drawArc, drawPie, The Coordinate System

drawConvexPolygon

public final void drawConvexPolygon(QPolygonF polygon)

Draws the convex polygon defined by polygon using the current pen and brush.


drawConvexPolygon

public final void drawConvexPolygon(QPolygon polygon)

Draws the convex polygon defined by polygon using the current pen and brush.


drawEllipse

public final void drawEllipse(QRectF r)

Draws the ellipse defined by the given r.

A filled ellipse has a size of r.size(). A stroked ellipse has a size of r.size() plus the pen width.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);

    QPainter painter(this);
    painter.drawEllipse(rectangle);

See Also:
drawPie, The Coordinate System

drawEllipse

public final void drawEllipse(QRect r)

Draws the ellipse defined by the given r.


drawEllipse

public final void drawEllipse(int x,
                              int y,
                              int w,
                              int h)

Draws the ellipse defined by the rectangle beginning at (x, y) with the given w and h.


drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr,
                            Qt.ImageConversionFlag... flags)

Draws the rectangular portion sr of the given image with its origin at the given p.


drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr)

Equivalent to drawImage(p, image, sr, Qt::AutoColor).


drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr,
                            Qt.ImageConversionFlags flags)

Draws the rectangular portion sr of the given image with its origin at the given p.


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr,
                            Qt.ImageConversionFlag... flags)

Draws the rectangular portion sr of the given image with its origin at the given p.


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr)

Equivalent to drawImage(p, image, sr, Qt::AutoColor).


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr,
                            Qt.ImageConversionFlags flags)

Draws the rectangular portion sr of the given image with its origin at the given p.


drawImage

public final void drawImage(QRect r,
                            QImage image)

Draws the given image into the given r.


drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect,
                            Qt.ImageConversionFlag... flags)

Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

    QRectF target(10.0, 20.0, 80.0, 60.0);
    QRectF source(0.0, 0.0, 70.0, 40.0);
    QImage image(":/images/myImage.png");

    QPainter(this);
    painter.drawImage(target, image, source);

See Also:
drawPixmap

drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect)

Equivalent to drawImage(targetRect, image, sourceRect, Qt::AutoColor).


drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect,
                            Qt.ImageConversionFlags flags)

Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

    QRectF target(10.0, 20.0, 80.0, 60.0);
    QRectF source(0.0, 0.0, 70.0, 40.0);
    QImage image(":/images/myImage.png");

    QPainter(this);
    painter.drawImage(target, image, source);

See Also:
drawPixmap

drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh,
                            Qt.ImageConversionFlag... flags)

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh)

Equivalent to drawImage(x, y, image, sx, sy, sw, sh, Qt::AutoColor).


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw)

Equivalent to drawImage(x, y, image, sx, sy, sw, -1, Qt::AutoColor).


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy)

Equivalent to drawImage(x, y, image, sx, sy, -1, -1, Qt::AutoColor).


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx)

Equivalent to drawImage(x, y, image, sx, 0, -1, -1, Qt::AutoColor).


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image)

Equivalent to drawImage(x, y, image, 0, 0, -1, -1, Qt::AutoColor).


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh,
                            Qt.ImageConversionFlags flags)

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(QPointF p,
                            QImage image)

Draws the given image at the given p.


drawImage

public final void drawImage(QPoint p,
                            QImage image)

Draws the given image at the given p.


drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect,
                            Qt.ImageConversionFlag... flags)

Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.


drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect)

Equivalent to drawImage(targetRect, image, sourceRect, Qt::AutoColor).


drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect,
                            Qt.ImageConversionFlags flags)

Draws the rectangular portion sourceRect of the given image into the targetRect rectangle in the paint device.


drawImage

public final void drawImage(QRectF r,
                            QImage image)

Draws the given image into the given r.


drawLine

public final void drawLine(QLine line)

Draws a line defined by line.


drawLine

public final void drawLine(QPoint p1,
                           QPoint p2)

Draws a line from p1 to p2.


drawLine

public final void drawLine(QPointF p1,
                           QPointF p2)

Draws a line from p1 to p2.


drawLine

public final void drawLine(int x1,
                           int y1,
                           int x2,
                           int y2)

Draws a line from (x1, y1) to (x2, y2) and sets the current pen position to (x2, y2).


drawLine

public final void drawLine(QLineF line)

Draws a line defined by line.

    QLineF line(10.0, 80.0, 90.0, 20.0);

    QPainter(this);
    painter.drawLine(line);

See Also:
drawLines, drawPolyline, The Coordinate System

drawLinesFromPointsF

public final void drawLinesFromPointsF(java.util.List<QPointF> pointPairs)

Draws a line for each pair of points in the vector pointPairs using the current pen. If there is an odd number of points in the array, the last point will be ignored.


drawLinesF

public final void drawLinesF(java.util.List<QLineF> lines)

Draws the set of lines defined by the list lines using the current pen and brush.


drawLines

public final void drawLines(java.util.List<QLine> lines)

Draws the set of lines defined by the list lines using the current pen and brush.


drawLinesFromPoints

public final void drawLinesFromPoints(java.util.List<QPoint> pointPairs)

Draws a line for each pair of points in the vector pointPairs using the current pen.


drawPath

public final void drawPath(QPainterPath path)

Draws the given painter path using the current pen for outline and the current brush for filling.

    QPainterPath path;
    path.moveTo(20, 80);
    path.lineTo(20, 30);
    path.cubicTo(80, 0, 50, 50, 80, 80);

    QPainter painter(this);
    painter.drawPath(path);

See Also:
Painter Paths example, Vector Deformation demo

drawPicture

public final void drawPicture(QPoint p,
                              QPicture picture)

Replays the given picture at the given p.


drawPicture

public final void drawPicture(QPointF p,
                              QPicture picture)

Replays the given picture at the given p.

The QPicture class is a paint device that records and replays QPainter commands. A picture serializes the painter commands to an IO device in a platform-independent format. Everything that can be painted on a widget or pixmap can also be stored in a picture.

This function does exactly the same as QPicture::play() when called with p = QPoint(0, 0).

    QPicture picture;
    QPointF point(10.0, 20.0)
    picture.load("drawing.pic");

    QPainter painter(this);
    painter.drawPicture(0, 0, picture);

See Also:
QPicture::play

drawPicture

public final void drawPicture(int x,
                              int y,
                              QPicture picture)

Draws the given picture at point (x, y).


drawPie

public final void drawPie(int x,
                          int y,
                          int w,
                          int h,
                          int a,
                          int alen)

Draws the pie defined by the rectangle beginning at (x, y) with the specified w and h, and the given a and alen.


drawPie

public final void drawPie(QRect arg__1,
                          int a,
                          int alen)

Draws a pie defined by the given arg__1, a and and alen.


drawPie

public final void drawPie(QRectF rect,
                          int a,
                          int alen)

Draws a pie defined by the given rect, a and and alen.

The pie is filled with the current brush.

The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    int startAngle = 30 * 16;
    int spanAngle = 120 * 16;

    QPainter painter(this);
    painter.drawPie(rectangle, startAngle, spanAngle);

See Also:
drawEllipse, drawChord, The Coordinate System

drawPixmap

public final void drawPixmap(QRect r,
                             QPixmap pm)

Draws the given pm into the given r.


drawPixmap

public final void drawPixmap(QPoint p,
                             QPixmap pm,
                             QRect sr)

Draws the rectangular portion sr of the given pm with its origin at the given p.


drawPixmap

public final void drawPixmap(QRectF targetRect,
                             QPixmap pixmap,
                             QRectF sourceRect)

Draws the rectangular portion sourceRect of the given pixmap into the given targetRect in the paint device.

    QRectF target(10.0, 20.0, 80.0, 60.0);
    QRectF source(0.0, 0.0, 70.0, 40.0);
    QPixmap pixmap(":myPixmap.png");

    QPainter(this);
    painter.drawPixmap(target, image, source);

If pixmap is a QBitmap it is drawn with the bits that are "set" using the pens color. If backgroundMode is Qt::OpaqueMode, the "unset" bits are drawn using the color of the background brush; if backgroundMode is Qt::TransparentMode, the "unset" bits are transparent. Drawing bitmaps with gradient or texture colors is not supported.

See Also:
drawImage

drawPixmap

public final void drawPixmap(QPointF p,
                             QPixmap pm)

Draws the given pm with its origin at the given p.


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             int w,
                             int h,
                             QPixmap pm,
                             int sx,
                             int sy,
                             int sw,
                             int sh)

Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the given pm , at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy;


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             QPixmap pm)

Draws the given pm at position (x, y).


drawPixmap

public final void drawPixmap(QPoint p,
                             QPixmap pm)

Draws the given pm with its origin at the given p.


drawPixmap

public final void drawPixmap(QPointF p,
                             QPixmap pm,
                             QRectF sr)

Draws the rectangular portion sr of the given pm with its origin at the given p.


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             int w,
                             int h,
                             QPixmap pm)

Draws the pm into the rectangle at position (x, y) with the given w and h.


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             QPixmap pm,
                             int sx,
                             int sy,
                             int sw,
                             int sh)

Draws a pixmap at (x, y) by copying a part of the given pm into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in pm that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the pixmap that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the pixmap.


drawPixmap

public final void drawPixmap(QRect targetRect,
                             QPixmap pixmap,
                             QRect sourceRect)

Draws the rectangular portion sourceRect of the given pixmap into the given targetRect in the paint device.


drawPoint

public final void drawPoint(QPointF pt)

Draws a single point at the given pt using the current pen's color.

See Also:
The Coordinate System

drawPoint

public final void drawPoint(int x,
                            int y)

Draws a single point at position (x, y).


drawPoint

public final void drawPoint(QPoint p)

Draws a single point at the given p using the current pen's color.


drawPoints

public final void drawPoints(QPolygon points)

Draws the points in the vector points.


drawPoints

public final void drawPoints(QPolygonF points)

Draws the points in the vector points.


drawPolygon

public final void drawPolygon(QPolygonF polygon)

Equivalent to drawPolygon(polygon, Qt::OddEvenFill).


drawPolygon

public final void drawPolygon(QPolygonF polygon,
                              Qt.FillRule fillRule)

Draws the polygon defined by the given polygon using the fill rule fillRule.


drawPolygon

public final void drawPolygon(QPolygon polygon)

Equivalent to drawPolygon(polygon, Qt::OddEvenFill).


drawPolygon

public final void drawPolygon(QPolygon polygon,
                              Qt.FillRule fillRule)

Draws the polygon defined by the given polygon using the fill rule fillRule.


drawPolyline

public final void drawPolyline(QPolygon polygon)

Draws the polyline defined by the given polygon using the current pen.


drawPolyline

public final void drawPolyline(QPolygonF polyline)

Draws the polyline defined by the given polyline using the current pen.


drawRect

public final void drawRect(int x1,
                           int y1,
                           int w,
                           int h)

Draws a rectangle with upper left corner at (x1, y1) and with the given w and h.


drawRect

public final void drawRect(QRectF rect)

Draws the current rect with the current pen and brush.

A filled rectangle has a size of rect.size(). A stroked rectangle has a size of rect.size() plus the pen width.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);

    QPainter painter(this);
    painter.drawRect(rectangle);

See Also:
drawRects, drawPolygon, The Coordinate System

drawRect

public final void drawRect(QRect rect)

Draws the current rect with the current pen and brush.


drawRects

public final void drawRects(java.util.List<QRect> rectangles)

Draws the given rectangles using the current pen and brush.


drawRectsF

public final void drawRectsF(java.util.List<QRectF> rectangles)

Draws the given rectangles using the current pen and brush.


drawRoundRect

public final void drawRoundRect(QRect r,
                                int xround)

Equivalent to drawRoundRect(r, xround, 25).


drawRoundRect

public final void drawRoundRect(QRect r)

Equivalent to drawRoundRect(r, 25, 25).


drawRoundRect

public final void drawRoundRect(QRect r,
                                int xround,
                                int yround)

Draws the rectangle r with rounded corners.


drawRoundRect

public final void drawRoundRect(QRectF r,
                                int xround)

Equivalent to drawRoundRect(r, xround, 25).


drawRoundRect

public final void drawRoundRect(QRectF r)

Equivalent to drawRoundRect(r, 25, 25).


drawRoundRect

public final void drawRoundRect(QRectF r,
                                int xround,
                                int yround)

Draws a rectangle r with rounded corners.

The xround and yround arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.

A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.

    QRectF rectangle(10.0, 20.0, 80.0, 60.0);

    QPainter painter(this);
    painter.drawRoundRect(rectangle);

See Also:
drawRect, QPen

drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h,
                                int arg__5)

Equivalent to drawRoundRect(x, y, w, h, arg__5, 25).


drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h)

Equivalent to drawRoundRect(x, y, w, h, 25, 25).


drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h,
                                int arg__5,
                                int arg__6)

Draws the rectangle x, y, w, h with rounded corners.


drawText

public final void drawText(QRectF r,
                           java.lang.String text)

Equivalent to drawText(r, text, QTextOption()).


drawText

public final void drawText(QRectF r,
                           java.lang.String text,
                           QTextOption o)

Draws the given text in the r specified using the o to control its positioning and orientation.


drawText

public final void drawText(int x,
                           int y,
                           java.lang.String s)

Draws the given s at position (x, y), using the painter's currently defined text direction.


drawText

public final void drawText(QPointF p,
                           java.lang.String s)

Draws the given s with the currently defined text direction, beginning at the given p.

This function does not break text into multiple lines. Use the QPainter::drawText() overload that takes a rectangle instead if you want line breaking.


drawText

public final void drawText(QPoint p,
                           java.lang.String s)

Draws the given s with the currently defined text direction, beginning at the given p.


drawTextItem

public final void drawTextItem(int x,
                               int y,
                               QTextItem ti)

This method is used internally by Qt Jambi. Do not use it in your applications.


drawTextItem

public final void drawTextItem(QPoint p,
                               QTextItem ti)

This method is used internally by Qt Jambi. Do not use it in your applications.


drawTextItem

public final void drawTextItem(QPointF p,
                               QTextItem ti)

This method is used internally by Qt Jambi. Do not use it in your applications.


drawTiledPixmap

public final void drawTiledPixmap(QRectF rect,
                                  QPixmap pm)

Equivalent to drawTiledPixmap(rect, pm, QPointF()).


drawTiledPixmap

public final void drawTiledPixmap(QRectF rect,
                                  QPixmap pm,
                                  QPointF offset)

Draws a tiled pm, inside the given rect with its origin at the given offset.

Calling drawTiledPixmap is similar to calling drawPixmap several times to fill (tile) an area with a pixmap, but is potentially much more efficient depending on the underlying window system.

See Also:
drawPixmap

drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5,
                                  int sx)

Equivalent to drawTiledPixmap(x, y, w, h, arg__5, sx, 0).


drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5)

Equivalent to drawTiledPixmap(x, y, w, h, arg__5, 0, 0).


drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5,
                                  int sx,
                                  int sy)

Draws a tiled arg__5 in the specified rectangle.

(x, y) specifies the top-left point in the paint device that is to be drawn onto; with the given w and h. (sx, sy) specifies the top-left point in the arg__5 that is to be drawn; this defaults to (0, 0).


drawTiledPixmap

public final void drawTiledPixmap(QRect arg__1,
                                  QPixmap arg__2)

Equivalent to drawTiledPixmap(arg__1, arg__2, QPoint()).


drawTiledPixmap

public final void drawTiledPixmap(QRect arg__1,
                                  QPixmap arg__2,
                                  QPoint arg__3)

Draws a tiled arg__2, inside the given arg__1 with its origin at the given arg__3.


end

public final boolean end()

Ends painting. Any resources used while painting are released. You don't normally need to call this since it is called by the destructor.

Returns true if the painter is no longer active; otherwise returns false.

See Also:
begin, isActive

eraseRect

public final void eraseRect(int x,
                            int y,
                            int w,
                            int h)

Erases the area inside the rectangle beginning at (x, y) with the given w and h.


eraseRect

public final void eraseRect(QRectF arg__1)

Erases the area inside the given arg__1. Equivalent to calling

    fillRect(rectangle, background()).

See Also:
fillRect

eraseRect

public final void eraseRect(QRect arg__1)

Erases the area inside the given arg__1.


fillPath

public final void fillPath(QPainterPath path,
                           QBrush brush)

Fills the given path using the given brush. The outline is not drawn.

Alternatively, you can specify a QColor instead of a QBrush; the QBrush constructor (taking a QColor argument) will automatically create a solid pattern brush.

See Also:
drawPath

fillRect

public final void fillRect(QRect arg__1,
                           QBrush arg__2)

Fills the given arg__1 with the given arg__2.


fillRect

public final void fillRect(int x,
                           int y,
                           int w,
                           int h,
                           QBrush arg__5)

Fills the rectangle beginning at (x, y) with the given w and h, using the given arg__5.


fillRect

public final void fillRect(QRectF arg__1,
                           QBrush arg__2)

Fills the given arg__1 with the given arg__2.

Alternatively, you can specify a QColor instead of a QBrush; the QBrush constructor (taking a QColor argument) will automatically create a solid pattern brush.

See Also:
drawRect

font

public final QFont font()

Returns the currently set font used for drawing text.

See Also:
setFont, drawText, Settings

fontInfo

public final QFontInfo fontInfo()

Returns the font info for the painter if the painter is active. Otherwise, the return value is undefined.

See Also:
font, isActive, Settings

fontMetrics

public final QFontMetrics fontMetrics()

Returns the font metrics for the painter if the painter is active. Otherwise, the return value is undefined.

See Also:
font, isActive, Settings

hasClipping

public final boolean hasClipping()

Returns true if clipping has been set; otherwise returns false.

See Also:
setClipping, Clipping

initFrom

public final void initFrom(QWidget widget)

Initializes the painters pen, background and font to the same as the given widget. Call this function after begin while the painter is active.

See Also:
begin, Settings

isActive

public final boolean isActive()

Returns true if begin has been called and end has not yet been called; otherwise returns false.

See Also:
begin, QPaintDevice::paintingActive

layoutDirection

public final Qt.LayoutDirection layoutDirection()

Returns the layout direction used by the painter when drawing text.

See Also:
setLayoutDirection, drawText, Settings

opacity

public final double opacity()

Returns the opacity of the painter. The default value is 1.

See Also:
setOpacity

paintEngine

public final QPaintEngine paintEngine()

Returns the paint engine that the painter is currently operating on if the painter is active; otherwise 0.

See Also:
isActive

pen

public final QPen pen()

Returns the painter's current pen.

See Also:
setPen, Settings

renderHints

public final QPainter.RenderHints renderHints()

Returns a flag that specifies the rendering hints that are set for this painter.

See Also:
setRenderHints, testRenderHint, Quality

resetMatrix

public final void resetMatrix()

Resets any transformations that were made using translate, scale, shear, rotate, setWorldMatrix, setViewport and setWindow.

It is advisable to use resetTransform instead of this function to preserve the properties of perspective transformations.

See Also:
Transformations

resetTransform

public final void resetTransform()

Resets any transformations that were made using translate, scale, shear, rotate, setWorldTransform, setViewport and setWindow.

See Also:
Coordinate Transformations

restore

public final void restore()

Restores the current painter state (pops a saved state off the stack).

See Also:
save

rotate

public final void rotate(double a)

Rotates the coordinate system the given a clockwise.

See Also:
setWorldMatrix, Transformations

save

public final void save()

Saves the current painter state (pushes the state onto a stack). A save must be followed by a corresponding restore; the end function unwinds the stack.

See Also:
restore

scale

public final void scale(double sx,
                        double sy)

Scales the coordinate system by (sx, sy).

See Also:
setWorldMatrix, Transformations

setBackground

public final void setBackground(QBrush bg)

Sets the background brush of the painter to the given bg.

The background brush is the brush that is filled in when drawing opaque text, stippled lines and bitmaps. The background brush has no effect in transparent background mode (which is the default).

See Also:
background, setBackgroundMode, Settings

setBackgroundMode

public final void setBackgroundMode(Qt.BGMode mode)

Sets the background mode of the painter to the given mode

Qt::TransparentMode (the default) draws stippled lines and text without setting the background pixels. Qt::OpaqueMode fills these space with the current background color.

Note that in order to draw a bitmap or pixmap transparently, you must use QPixmap::setMask().

See Also:
backgroundMode, setBackground, Settings

setBrush

public final void setBrush(QBrush brush)

Sets the painter's brush to the given brush.

The painter's brush defines how shapes are filled.

See Also:
brush, Settings

setBrush

public final void setBrush(Qt.BrushStyle style)

Sets the painter's brush to black color and the specified style.

See Also:
brush

setBrushOrigin

public final void setBrushOrigin(QPoint arg__1)

Sets the brush's origin to the given arg__1.


setBrushOrigin

public final void setBrushOrigin(int x,
                                 int y)

Sets the brush's origin to point (x, y).


setBrushOrigin

public final void setBrushOrigin(QPointF arg__1)

Sets the brush origin to arg__1.

The brush origin specifies the (0, 0) coordinate of the painter's brush. This setting only applies to pattern brushes and pixmap brushes.

Note that while the brushOrigin was necessary to adopt the parent's background for a widget in Qt 3, this is no longer the case since the Qt 4 painter doesn't paint the background unless you explicitly tell it to do so by setting the widget's autoFillBackground property to true.

See Also:
brushOrigin, Settings

setClipPath

public final void setClipPath(QPainterPath path)

Equivalent to setClipPath(path, Qt::ReplaceClip).


setClipPath

public final void setClipPath(QPainterPath path,
                              Qt.ClipOperation op)

Enables clipping, and sets the clip path for the painter to the given path, with the clip op.

Note that the clip path is specified in logical (painter) coordinates.

See Also:
clipPath, clipRegion, Clipping

setClipRect

public final void setClipRect(QRectF arg__1)

Equivalent to setClipRect(arg__1, Qt::ReplaceClip).


setClipRect

public final void setClipRect(QRectF arg__1,
                              Qt.ClipOperation op)

Enables clipping, and sets the clip region to the given arg__1 using the given clip op. The default operation is to replace the current clip rectangle.

Note that the clip rectangle is specified in logical (painter) coordinates.

See Also:
clipRegion, setClipping, Clipping

setClipRect

public final void setClipRect(int x,
                              int y,
                              int w,
                              int h)

Equivalent to setClipRect(x, y, w, h, Qt::ReplaceClip).


setClipRect

public final void setClipRect(int x,
                              int y,
                              int w,
                              int h,
                              Qt.ClipOperation op)

Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given w and h.


setClipRect

public final void setClipRect(QRect arg__1)

Equivalent to setClipRect(arg__1, Qt::ReplaceClip).


setClipRect

public final void setClipRect(QRect arg__1,
                              Qt.ClipOperation op)

Enables clipping, and sets the clip region to the given arg__1 using the given clip op.


setClipRegion

public final void setClipRegion(QRegion arg__1)

Equivalent to setClipRegion(arg__1, Qt::ReplaceClip).


setClipRegion

public final void setClipRegion(QRegion arg__1,
                                Qt.ClipOperation op)

Sets the clip region to the given arg__1 using the specified clip op. The default clip operation is to replace the current clip region.

Note that the clip region is given in logical coordinates.

See Also:
clipRegion, setClipRect, Clipping

setClipping

public final void setClipping(boolean enable)

Enables clipping if enable is true, or disables clipping if enable is false.

See Also:
hasClipping, Clipping

setCompositionMode

public final void setCompositionMode(QPainter.CompositionMode mode)

Sets the composition mode to the given mode.

Warning: You can only set the composition mode for QPainter objects that operates on a QImage.

See Also:
compositionMode

setFont

public final void setFont(QFont f)

Sets the painter's font to the given f.

This font is used by subsequent drawText functions. The text color is the same as the pen color.

If you set a font that isn't available, Qt finds a close match. font will return what you set using setFont and fontInfo returns the font actually being used (which may be the same).

See Also:
font, drawText, Settings

setLayoutDirection

public final void setLayoutDirection(Qt.LayoutDirection direction)

Sets the layout direction used by the painter when drawing text, to the specified direction.

See Also:
layoutDirection, drawText, Settings

setOpacity

public final void setOpacity(double opacity)

Sets the opacity of the painter to opacity. The value should be in the range 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.

Opacity set on the painter will apply to all drawing operations individually.

See Also:
opacity

setPen

public final void setPen(QColor color)

Sets the painter's pen to have style Qt::SolidLine, width 0 and the specified color.


setPen

public final void setPen(QPen pen)

Sets the painter's pen to be the given pen.

The pen defines how to draw lines and outlines, and it also defines the text color.

See Also:
pen, Settings

setPen

public final void setPen(Qt.PenStyle style)

Sets the painter's pen to have the given style, width 0 and black color.

See Also:
pen

setRenderHint

public final void setRenderHint(QPainter.RenderHint hint)

Equivalent to setRenderHint(hint, true).


setRenderHint

public final void setRenderHint(QPainter.RenderHint hint,
                                boolean on)

Sets the given render hint on the painter if on is true; otherwise clears the render hint.

See Also:
setRenderHints, renderHints, Quality

setRenderHints

public final void setRenderHints(QPainter.RenderHints hints)

Equivalent to setRenderHints(hints, true).


setRenderHints

public final void setRenderHints(QPainter.RenderHints hints,
                                 boolean on)

Sets the given render hints on the painter if on is true; otherwise clears the render hints.

See Also:
setRenderHint, renderHints, Quality

setTransform

public final void setTransform(QTransform transform)

Equivalent to setTransform(transform, false).


setTransform

public final void setTransform(QTransform transform,
                               boolean combine)

Sets the world transformation matrix. If combine is true, the specified transform is combined with the current matrix; otherwise it replaces the current matrix.

This function has been added for compatibility with setMatrix(), but as with setMatrix() the preferred method of setting a transformation on the painter is through setWorldTransform.

See Also:
transform

setViewTransformEnabled

public final void setViewTransformEnabled(boolean enable)

Enables view transformations if enable is true, or disables view transformations if enable is false.

See Also:
viewTransformEnabled, Window-Viewport Conversion

setViewport

public final void setViewport(int x,
                              int y,
                              int w,
                              int h)

Sets the painter's viewport rectangle to be the rectangle beginning at (x, y) with the given w and h.


setViewport

public final void setViewport(QRect viewport)

Sets the painter's viewport rectangle to the given viewport, and enables view transformations.

The viewport rectangle is part of the view transformation. The viewport specifies the device coordinate system. Its sister, the window, specifies the logical coordinate system.

The default viewport rectangle is the same as the device's rectangle.

See Also:
viewport, viewTransformEnabled, Window-Viewport Conversion

setWindow

public final void setWindow(int x,
                            int y,
                            int w,
                            int h)

Sets the painter's window to the rectangle beginning at (x, y) and the given w and h.


setWindow

public final void setWindow(QRect window)

Sets the painter's window to the given window, and enables view transformations.

The window rectangle is part of the view transformation. The window specifies the logical coordinate system. Its sister, the viewport, specifies the device coordinate system.

The default window rectangle is the same as the device's rectangle.

See Also:
window, viewTransformEnabled, Window-Viewport Conversion

setWorldMatrix

public final void setWorldMatrix(QMatrix matrix)

Equivalent to setWorldMatrix(matrix, false).


setWorldMatrix

public final void setWorldMatrix(QMatrix matrix,
                                 boolean combine)

Sets the transformation matrix to matrix and enables transformations.

Note: It is advisable to use setWorldTransform instead of this function to preserve the properties of perspective transformations.

If combine is true, then matrix is combined with the current transformation matrix; otherwise matrix replaces the current transformation matrix.

If matrix is the identity matrix and combine is false, this function calls setWorldMatrixEnabled(false). (The identity matrix is the matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the rest are 0.0.)

The following functions can transform the coordinate system without using a QMatrix:

They operate on the painter's worldMatrix and are implemented like this:

    void QPainter::rotate(qreal angle)
    {
        QMatrix matrix;
        matrix.rotate(angle);
        setWorldMatrix(matrix, true);
    }

Note that when using setWorldMatrix function you should always have combine be true when you are drawing into a QPicture. Otherwise it may not be possible to replay the picture with additional transformations; using the translate, scale, etc. convenience functions is safe.

For more information about the coordinate system, transformations and window-viewport conversion, see The Coordinate System documentation.

See Also:
worldMatrixEnabled, QMatrix

setWorldMatrixEnabled

public final void setWorldMatrixEnabled(boolean enabled)

Enables transformations if enabled is true, or disables transformations if enabled is false. The world transformation matrix is not changed.

See Also:
worldMatrixEnabled, worldMatrix, Transformations

setWorldTransform

public final void setWorldTransform(QTransform matrix)

Equivalent to setWorldTransform(matrix, false).


setWorldTransform

public final void setWorldTransform(QTransform matrix,
                                    boolean combine)

Sets the world transformation matrix. If combine is true, the specified matrix is combined with the current matrix; otherwise it replaces the current matrix.

See Also:
worldTransform, transform, setTransform

shear

public final void shear(double sh,
                        double sv)

Shears the coordinate system by (sh, sv).

See Also:
setWorldMatrix, Transformations

strokePath

public final void strokePath(QPainterPath path,
                             QPen pen)

Draws the outline (strokes) the path path with the pen specified by pen

See Also:
fillPath, Drawing

testRenderHint

public final boolean testRenderHint(QPainter.RenderHint hint)

Returns true if hint is set; otherwise returns false.

See Also:
renderHints, setRenderHint

transform

public final QTransform transform()

Returns the world transformation matrix.

See Also:
setTransform

translate

public final void translate(double dx,
                            double dy)

Translates the coordinate system by the vector (dx, dy).


translate

public final void translate(QPointF offset)

Translates the coordinate system by the given offset; i.e. the given offset is added to points.

See Also:
setWorldMatrix, Transformations

translate

public final void translate(QPoint offset)

Translates the coordinate system by the given offset.


viewTransformEnabled

public final boolean viewTransformEnabled()

Returns true if view transformation is enabled; otherwise returns false.

See Also:
setViewTransformEnabled, worldMatrix

viewport

public final QRect viewport()

Returns the viewport rectangle.

See Also:
setViewport, setViewTransformEnabled

window

public final QRect window()

Returns the window rectangle.

See Also:
setWindow, setViewTransformEnabled

worldMatrix

public final QMatrix worldMatrix()

Returns the world transformation matrix.

It is advisable to use worldTransform because worldMatrix does not preserve the properties of perspective transformations.

See Also:
setWorldMatrix, Transformations, The Coordinate System

worldMatrixEnabled

public final boolean worldMatrixEnabled()

Returns true if world transformation is enabled; otherwise returns false.

See Also:
setWorldMatrixEnabled, worldMatrix, The Coordinate System

worldTransform

public final QTransform worldTransform()

Returns the world transformation matrix.

See Also:
setWorldTransform

restoreRedirected

public static void restoreRedirected(QPaintDeviceInterface device)

Restores the previous redirection for the given device after a call to setRedirected.

See Also:
redirected

setRedirected

public static void setRedirected(QPaintDeviceInterface device,
                                 QPaintDeviceInterface replacement)

Equivalent to setRedirected(device, replacement, QPoint()).


setRedirected

public static void setRedirected(QPaintDeviceInterface device,
                                 QPaintDeviceInterface replacement,
                                 QPoint offset)

Redirects all paint commands for the given paint device, to the replacement device. The optional point offset defines an offset within the source device.

The redirection will not be effective until the begin function has been called; make sure to call end for the given device's painter (if any) before redirecting. Call restoreRedirected to restore the previous redirection.

In general, you'll probably find that calling QPixmap::grabWidget() or QPixmap::grabWindow() is an easier solution.

See Also:
redirected, restoreRedirected

fromNativePointer

public static QPainter fromNativePointer(QNativePointer nativePointer)
This function returns the QPainter instance pointed to by nativePointer

Parameters:
nativePointer - the QNativePointer of which object should be returned.

setBrush

public void setBrush(QColor color)
Sets the brush of this QPainter to a solid color brush.


setBrush

public void setBrush(QGradient gradient)
Sets this QPainter's brush to use gradient. gradient


setBrush

public void setBrush(QPixmap pm)
Sets this QPainter's brush to use pm.


drawText

public final void drawText(QRect rectangle,
                           int flags,
                           java.lang.String text,
                           QRect boundingRect)
Draws the given text within the provided rectangle.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of Qt.AlignmentFlags.


drawText

public final void drawText(QRect rectangle,
                           int flags,
                           java.lang.String text)
This is an overloaded function provided for convenience.


drawText

public final void drawText(QRectF rectangle,
                           int flags,
                           java.lang.String text,
                           QRectF boundingRect)
Draws the given text within the provided rectangle.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of Qt.AlignmentFlags.


drawText

public final void drawText(QRectF rectangle,
                           int flags,
                           java.lang.String text)
This is an overloaded method provided for convenience.


drawText

public final void drawText(int x,
                           int y,
                           int width,
                           int height,
                           int flags,
                           java.lang.String text,
                           QRect boundingRect)
Draws the given text within the rectangle with origin (x, y), width and height
.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of the following flags:


drawText

public final void drawText(int x,
                           int y,
                           int width,
                           int height,
                           int flags,
                           java.lang.String text)
This is an overloaded method provided for convenience.


redirected

public static QPaintDeviceInterface redirected(QPaintDeviceInterface device,
                                               QPoint offset)
Returns the replacement for given device. The optional out parameter offset returns the offset within the replaced device.


begin

public boolean begin(QWidget widget)
This method initializes the painter to draw on widget. It returns true if successful; otherwise, it returns false.