QwtPlotCurve Class Reference

A plot item, that represents a series of points. More...

#include <qwt_plot_curve.h>

Inheritance diagram for QwtPlotCurve:

Inheritance graph
[legend]

List of all members.

Public Types

enum  CurveAttribute {
  Inverted = 0x01,
  Fitted = 0x02
}
typedef QFlags< CurveAttributeCurveAttributes
enum  CurveStyle {
  NoCurve = -1,
  Lines,
  Sticks,
  Steps,
  Dots,
  UserCurve = 100
}
enum  ItemAttribute {
  Legend = 0x01,
  AutoScale = 0x02
}
typedef QFlags< ItemAttributeItemAttributes
enum  LegendAttribute {
  LegendNoAttribute = 0x00,
  LegendShowLine = 0x01,
  LegendShowSymbol = 0x02,
  LegendShowBrush = 0x04
}
typedef QFlags< LegendAttributeLegendAttributes
enum  PaintAttribute {
  ClipPolygons = 0x01,
  CacheSymbols = 0x02
}
typedef QFlags< PaintAttributePaintAttributes
enum  RenderHint { RenderAntialiased = 1 }
typedef QFlags< RenderHintRenderHints
enum  RttiValues {
  Rtti_PlotItem = 0,
  Rtti_PlotGrid,
  Rtti_PlotScale,
  Rtti_PlotMarker,
  Rtti_PlotCurve,
  Rtti_PlotSpectroCurve,
  Rtti_PlotIntervalCurve,
  Rtti_PlotHistogram,
  Rtti_PlotSpectrogram,
  Rtti_PlotSVG,
  Rtti_PlotUserItem = 1000
}

Public Member Functions

void attach (QwtPlot *plot)
double baseline () const
virtual QRectF boundingRect () const
const QBrush & brush () const
int closestPoint (const QPoint &pos, double *dist=NULL) const
QwtCurveFittercurveFitter () const
const QwtSeriesData< QPointF > * data () const
QwtSeriesData< QPointF > * data ()
size_t dataSize () const
void detach ()
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
virtual void drawLegendIdentifier (QPainter *, const QRectF &) const
virtual void drawSeries (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void hide ()
bool isVisible () const
virtual void itemChanged ()
virtual QWidget * legendItem () const
double maxXValue () const
double maxYValue () const
double minXValue () const
double minYValue () const
Qt::Orientation orientation () const
QRectF paintRect (const QwtScaleMap &, const QwtScaleMap &) const
const QPen & pen () const
QwtPlotplot () const
 QwtPlotCurve (const QwtText &title)
 QwtPlotCurve (const QString &title=QString::null)
virtual int rtti () const
QPointF sample (int index) const
QRectF scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
void setAxes (int xAxis, int yAxis)
void setBaseline (double ref)
void setBrush (const QBrush &)
void setCurveAttribute (CurveAttribute, bool on=true)
void setCurveFitter (QwtCurveFitter *)
void setData (QwtSeriesData< QPointF > *)
void setItemAttribute (ItemAttribute, bool on=true)
void setLegendAttribute (LegendAttribute, bool on=true)
void setOrientation (Qt::Orientation)
void setPaintAttribute (PaintAttribute, bool on=true)
void setPen (const QPen &)
void setRawSamples (const double *xData, const double *yData, int size)
void setRenderHint (RenderHint, bool on=true)
void setSamples (const QVector< QPointF > &)
void setSamples (const QVector< double > &xData, const QVector< double > &yData)
void setSamples (const double *xData, const double *yData, int size)
void setStyle (CurveStyle style)
void setSymbol (const QwtSymbol *s)
void setTitle (const QwtText &title)
void setTitle (const QString &title)
virtual void setVisible (bool)
void setXAxis (int axis)
void setYAxis (int axis)
void setZ (double z)
void show ()
CurveStyle style () const
const QwtSymbolsymbol () const
bool testCurveAttribute (CurveAttribute) const
bool testItemAttribute (ItemAttribute) const
bool testLegendAttribute (LegendAttribute) const
bool testPaintAttribute (PaintAttribute) const
bool testRenderHint (RenderHint) const
const QwtTexttitle () const
virtual void updateLegend (QwtLegend *) const
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
int xAxis () const
int yAxis () const
double z () const
virtual ~QwtPlotCurve ()

Protected Member Functions

void closePolyline (QPainter *, const QwtScaleMap &, const QwtScaleMap &, QPolygonF &) const
virtual void drawCurve (QPainter *p, int style, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void drawDots (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void drawLines (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void drawSteps (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void drawSticks (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
virtual void drawSymbols (QPainter *p, const QwtSymbol &, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
virtual void fillCurve (QPainter *, const QwtScaleMap &, const QwtScaleMap &, const QRectF &canvasRect, QPolygonF &) const
void init ()

Protected Attributes

QwtSeriesData< QPointF > * d_series


Detailed Description

A plot item, that represents a series of points.

A curve is the representation of a series of points in the x-y plane. It supports different display styles, interpolation ( f.e. spline ) and symbols.

Usage
a) Assign curve properties
When a curve is created, it is configured to draw black solid lines with in QwtPlotCurve::Lines style and no symbols. You can change this by calling setPen(), setStyle() and setSymbol().
b) Connect/Assign data.
QwtPlotCurve gets its points using a QwtSeriesData object offering a bridge to the real storage of the points ( like QAbstractItemModel ). There are several convenience classes derived from QwtSeriesData, that also store the points inside ( like QStandardItemModel ). QwtPlotCurve also offers a couple of variations of setSamples(), that build QwtSeriesData objects from arrays internally.
c) Attach the curve to a plot
See QwtPlotItem::attach()
Example:
see examples/bode
See also:
QwtPointSeriesData, QwtSymbol, QwtScaleMap

Member Typedef Documentation

Curve attributes.

typedef QFlags<ItemAttribute> QwtPlotItem::ItemAttributes [inherited]

Plot Item Attributes.

Legend attributes.

Paint attributes.

typedef QFlags<RenderHint> QwtPlotItem::RenderHints [inherited]

Render hints.


Member Enumeration Documentation

Attribute for drawing the curve

See also:
setCurveAttribute(), testCurveAttribute(), curveFitter()
Enumerator:
Inverted  For QwtPlotCurve::Steps only. Draws a step function from the right to the left.
Fitted  Only in combination with QwtPlotCurve::Lines A QwtCurveFitter tries to interpolate/smooth the curve, before it is painted.

Note:
Curve fitting requires temorary memory for calculating coefficients and additional points. If painting in QwtPlotCurve::Fitted mode is slow it might be better to fit the points, before they are passed to QwtPlotCurve.

Curve styles.

See also:
setStyle(), style()
Enumerator:
NoCurve  Don't draw a curve. Note: This doesn't affect the symbols.
Lines  Connect the points with straight lines. The lines might be interpolated depending on the 'Fitted' attribute. Curve fitting can be configured using setCurveFitter().
Sticks  Draw vertical or horizontal sticks ( depending on the orientation() ) from a baseline which is defined by setBaseline().
Steps  Connect the points with a step function. The step function is drawn from the left to the right or vice versa, depending on the QwtPlotCurve::Inverted attribute.
Dots  Draw dots at the locations of the data points. Note: This is different from a dotted line (see setPen()), and faster as a curve in QwtPlotCurve::NoStyle style and a symbol painting a point.
UserCurve  Styles >= QwtPlotCurve::UserCurve are reserved for derived classes of QwtPlotCurve that overload drawCurve() with additional application specific curve types.

enum QwtPlotItem::ItemAttribute [inherited]

Plot Item Attributes

See also:
setItemAttribute(), testItemAttribute()
Enumerator:
Legend  The item is represented on the legend.
AutoScale  The boundingRect() of the item is included in the autoscaling calculation.

Attributes how to represent the curve on the legend

See also:
setLegendAttribute(), testLegendAttribute(), drawLegendIdentifier()
Enumerator:
LegendNoAttribute  QwtPlotCurve tries to find a color representing the curve and paints a rectangle with it.
LegendShowLine  If the style() is not QwtPlotCurve::NoCurve a line is painted with the curve pen().
LegendShowSymbol  If the curve has a valid symbol it is painted.
LegendShowBrush  If the curve has a brush a rectangle filled with the curve brush() is painted.

Attributes to modify the drawing algorithm. The default setting enables ClipPolygons

See also:
setPaintAttribute(), testPaintAttribute()
Enumerator:
ClipPolygons  Clip polygons before painting them. In situations, where points are far outside the visible area (f.e when zooming deep) this might be a substantial improvement for the painting performance
CacheSymbols  Paint the symbol to a QPixmap and paint the pixmap instead rendering the symbol for each point. The flag has no effect, when the curve is not painted to the canvas ( f.e when exporting the plot to a PDF document ).

enum QwtPlotItem::RenderHint [inherited]

Render hints.

Enumerator:
RenderAntialiased  Enable antialiasing.

enum QwtPlotItem::RttiValues [inherited]

Runtime type information.

RttiValues is used to cast plot items, without having to enable runtime type information of the compiler.


Constructor & Destructor Documentation

QwtPlotCurve::QwtPlotCurve ( const QString &  title = QString::null  )  [explicit]

Constructor

Parameters:
title Title of the curve

QwtPlotCurve::QwtPlotCurve ( const QwtText title  )  [explicit]

Constructor

Parameters:
title Title of the curve

QwtPlotCurve::~QwtPlotCurve (  )  [virtual]

Destructor.


Member Function Documentation

void QwtPlotItem::attach ( QwtPlot plot  )  [inherited]

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:
plot Plot widget
See also:
detach()

double QwtPlotCurve::baseline (  )  const

Returns:
Value of the baseline
See also:
setBaseline()

virtual QRectF QwtPlotSeriesItem< QPointF >::boundingRect (  )  const [virtual, inherited]

Returns:
Bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid.
See also:
QwtSeriesData<T>::boundingRect(), QRectF::isValid()

Reimplemented from QwtPlotItem.

const QBrush & QwtPlotCurve::brush (  )  const

Returns:
Brush used to fill the area between lines and the baseline
See also:
setBrush(), setBaseline(), baseline()

void QwtPlotCurve::closePolyline ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
QPolygonF &  polygon 
) const [protected]

Complete a polygon to be a closed polygon including the area between the original polygon and the baseline.

Parameters:
painter Painter
xMap X map
yMap Y map
polygon Polygon to be completed

int QwtPlotCurve::closestPoint ( const QPoint &  pos,
double *  dist = NULL 
) const

Find the closest curve point for a specific position

Parameters:
pos Position, where to look for the closest curve point
dist If dist != NULL, closestPoint() returns the distance between the position and the clostest curve point
Returns:
Index of the closest curve point, or -1 if none can be found ( f.e when the curve has no points )
Note:
closestPoint() implements a dumb algorithm, that iterates over all points

QwtCurveFitter * QwtPlotCurve::curveFitter (  )  const

Get the curve fitter. If curve fitting is disabled NULL is returned.

Returns:
Curve fitter
See also:
setCurveFitter(), Fitted

void QwtPlotItem::detach (  )  [inherited]

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

detach() is equivalent to calling attach( NULL )

See also:
attach()

void QwtPlotAbstractSeriesItem::draw ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect 
) const [virtual, inherited]

Draw the complete series.

Parameters:
painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas

Implements QwtPlotItem.

void QwtPlotCurve::drawCurve ( QPainter *  painter,
int  style,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected, virtual]

Draw the line part (without symbols) of a curve interval.

Parameters:
painter Painter
style curve style, see QwtPlotCurve::CurveStyle
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from index of the first point to be painted
to index of the last point to be painted
See also:
draw(), drawDots(), drawLines(), drawSteps(), drawSticks()

void QwtPlotCurve::drawDots ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected]

Draw dots

Parameters:
painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from index of the first point to be painted
to index of the last point to be painted
See also:
draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()

void QwtPlotCurve::drawLegendIdentifier ( QPainter *  painter,
const QRectF &  rect 
) const [virtual]

Draw the identifier representing the curve on the legend.

Parameters:
painter Painter
rect Bounding rectangle for the identifier
See also:
setLegendAttribute(), QwtPlotItem::Legend

Reimplemented from QwtLegendItemManager.

void QwtPlotCurve::drawLines ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected]

Draw lines.

If the CurveAttribute Fitted is enabled a QwtCurveFitter tries to interpolate/smooth the curve, before it is painted.

Parameters:
painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from index of the first point to be painted
to index of the last point to be painted
See also:
setCurveAttribute(), setCurveFitter(), draw(), drawLines(), drawDots(), drawSteps(), drawSticks()

void QwtPlotCurve::drawSeries ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [virtual]

Draw an interval of the curve

Parameters:
painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas
from Index of the first point to be painted
to Index of the last point to be painted. If to < 0 the curve will be painted to its last point.
See also:
drawCurve(), drawSymbols(),

Implements QwtPlotAbstractSeriesItem.

void QwtPlotCurve::drawSteps ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected]

Draw step function

The direction of the steps depends on Inverted attribute.

Parameters:
painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from index of the first point to be painted
to index of the last point to be painted
See also:
CurveAttribute, setCurveAttribute(), draw(), drawCurve(), drawDots(), drawLines(), drawSticks()

void QwtPlotCurve::drawSticks ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected]

Draw sticks

Parameters:
painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from index of the first point to be painted
to index of the last point to be painted
See also:
draw(), drawCurve(), drawDots(), drawLines(), drawSteps()

void QwtPlotCurve::drawSymbols ( QPainter *  painter,
const QwtSymbol symbol,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const [protected, virtual]

Draw symbols

Parameters:
painter Painter
symbol Curve symbol
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from Index of the first point to be painted
to Index of the last point to be painted
See also:
setSymbol(), drawSeries(), drawCurve()

void QwtPlotCurve::fillCurve ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
QPolygonF &  polygon 
) const [protected, virtual]

Fill the area between the curve and the baseline with the curve brush

Parameters:
painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
polygon Polygon - will be modified !
See also:
setBrush(), setBaseline(), setStyle()

void QwtPlotItem::hide (  )  [inherited]

Hide the item.

void QwtPlotCurve::init (  )  [protected]

Initialize internal members.

bool QwtPlotItem::isVisible (  )  const [inherited]

Returns:
true if visible
See also:
setVisible(), show(), hide()

void QwtPlotItem::itemChanged (  )  [virtual, inherited]

Update the legend and call QwtPlot::autoRefresh for the parent plot.

See also:
updateLegend()

QWidget * QwtPlotItem::legendItem (  )  const [virtual, inherited]

Allocate the widget that represents the item on the legend.

The default implementation returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().

Returns:
QwtLegendItem()
See also:
updateLegend() QwtLegend()

Implements QwtLegendItemManager.

double QwtPlotCurve::maxXValue (  )  const [inline]

boundingRect().right()

double QwtPlotCurve::maxYValue (  )  const [inline]

boundingRect().bottom()

double QwtPlotCurve::minXValue (  )  const [inline]

double QwtPlotCurve::minYValue (  )  const [inline]

Qt::Orientation QwtPlotAbstractSeriesItem::orientation (  )  const [inherited]

Returns:
Orientation of the plot item
See also:
setOrientation()

QRectF QwtPlotItem::paintRect ( const QwtScaleMap xMap,
const QwtScaleMap yMap 
) const [inherited]

Calculate the bounding paint rect of 2 maps.

Parameters:
xMap X map
yMap X map
Returns:
Bounding paint rect of the scale maps, normalized

const QPen & QwtPlotCurve::pen (  )  const

Returns:
Pen used to draw the lines
See also:
setPen(), brush()

QwtPlot * QwtPlotItem::plot (  )  const [inherited]

Return attached plot.

int QwtPlotCurve::rtti (  )  const [virtual]

Returns:
QwtPlotItem::Rtti_PlotCurve

Reimplemented from QwtPlotItem.

QRectF QwtPlotItem::scaleRect ( const QwtScaleMap xMap,
const QwtScaleMap yMap 
) const [inherited]

Calculate the bounding scale rect of 2 maps.

Parameters:
xMap X map
yMap X map
Returns:
Bounding scale rect of the scale maps, normalized

void QwtPlotItem::setAxes ( int  xAxis,
int  yAxis 
) [inherited]

Set X and Y axis

The item will painted according to the coordinates its Axes.

Parameters:
xAxis X Axis
yAxis Y Axis
See also:
setXAxis(), setYAxis(), xAxis(), yAxis()

void QwtPlotCurve::setBaseline ( double  value  ) 

Set the value of the baseline.

The baseline is needed for filling the curve with a brush or the Sticks drawing style. The interpretation of the baseline depends on the CurveType. With QwtPlotCurve::Yfx, the baseline is interpreted as a horizontal line at y = baseline(), with QwtPlotCurve::Yfy, it is interpreted as a vertical line at x = baseline().

The default value is 0.0.

Parameters:
value Value of the baseline
See also:
baseline(), setBrush(), setStyle(), setStyle()

void QwtPlotCurve::setBrush ( const QBrush &  brush  ) 

Assign a brush.

In case of brush.style() != QBrush::NoBrush and style() != QwtPlotCurve::Sticks the area between the curve and the baseline will be filled.

In case !brush.color().isValid() the area will be filled by pen.color(). The fill algorithm simply connects the first and the last curve point to the baseline. So the curve data has to be sorted (ascending or descending).

Parameters:
brush New brush
See also:
brush(), setBaseline(), baseline()

void QwtPlotCurve::setCurveAttribute ( CurveAttribute  attribute,
bool  on = true 
)

Specify an attribute for drawing the curve

Parameters:
attribute Curve attribute
on On/Off
/sa testCurveAttribute(), setCurveFitter()

void QwtPlotCurve::setCurveFitter ( QwtCurveFitter curveFitter  ) 

Assign a curve fitter

The curve fitter "smooths" the curve points, when the Fitted CurveAttribute is set. setCurveFitter(NULL) also disables curve fitting.

The curve fitter operates on the translated points ( = widget coordinates) to be functional for logarithmic scales. Obviously this is less performant for fitting algorithms, that reduce the number of points.

For situations, where curve fitting is used to improve the performance of painting huge series of points it might be better to execute the fitter on the curve points once and to cache the result in the QwtSeriesData object.

Parameters:
curveFitter() Curve fitter
See also:
Fitted

void QwtPlotItem::setItemAttribute ( ItemAttribute  attribute,
bool  on = true 
) [inherited]

Toggle an item attribute

Parameters:
attribute Attribute type
on true/false
See also:
testItemAttribute(), ItemAttribute

void QwtPlotCurve::setLegendAttribute ( LegendAttribute  attribute,
bool  on = true 
)

Specify an attribute how to draw the legend identifier

Parameters:
attribute Attribute
on On/Off /sa testLegendAttribute()

void QwtPlotAbstractSeriesItem::setOrientation ( Qt::Orientation  orientation  )  [inherited]

Set the orientation of the item.

The orientation() might be used in specific way by a plot item. F.e. a QwtPlotCurve uses it to identify how to display the curve int QwtPlotCurve::Steps or QwtPlotCurve::Sticks style.

See also:
orientation()

void QwtPlotCurve::setPaintAttribute ( PaintAttribute  attribute,
bool  on = true 
)

Specify an attribute how to draw the curve

Parameters:
attribute Paint attribute
on On/Off
See also:
testPaintAttribute()

void QwtPlotCurve::setPen ( const QPen &  pen  ) 

Assign a pen

Parameters:
pen New pen
See also:
pen(), brush()

void QwtPlotCurve::setRawSamples ( const double *  xData,
const double *  yData,
int  size 
)

Initialize the data by pointing to memory blocks which are not managed by QwtPlotCurve.

setRawSamples is provided for efficiency. It is important to keep the pointers during the lifetime of the underlying QwtCPointerData class.

Parameters:
xData pointer to x data
yData pointer to y data
size size of x and y
See also:
QwtCPointerData

void QwtPlotItem::setRenderHint ( RenderHint  hint,
bool  on = true 
) [inherited]

Toggle an render hint

Parameters:
hint Render hint
on true/false
See also:
testRenderHint(), RenderHint

void QwtPlotCurve::setSamples ( const QVector< QPointF > &  samples  ) 

Initialize data with an array of points (explicitly shared).

Parameters:
samples Vector of points

void QwtPlotCurve::setSamples ( const QVector< double > &  xData,
const QVector< double > &  yData 
)

Initialize data with x- and y-arrays (explicitly shared).

Parameters:
xData x data
yData y data
See also:
QwtPointArrayData

void QwtPlotCurve::setSamples ( const double *  xData,
const double *  yData,
int  size 
)

Set data by copying x- and y-values from specified memory blocks. Contrary to setRawSamples(), this function makes a 'deep copy' of the data.

Parameters:
xData pointer to x values
yData pointer to y values
size size of xData and yData
See also:
QwtPointArrayData

void QwtPlotCurve::setStyle ( CurveStyle  style  ) 

Set the curve's drawing style

Parameters:
style Curve style
See also:
style()

void QwtPlotCurve::setSymbol ( const QwtSymbol symbol  ) 

Assign a symbol

Parameters:
symbol Symbol
See also:
symbol()

void QwtPlotItem::setTitle ( const QwtText title  )  [inherited]

Set a new title

Parameters:
title Title
See also:
title()

void QwtPlotItem::setTitle ( const QString &  title  )  [inherited]

Set a new title

Parameters:
title Title
See also:
title()

void QwtPlotItem::setVisible ( bool  on  )  [virtual, inherited]

Show/Hide the item

Parameters:
on Show if true, otherwise hide
See also:
isVisible(), show(), hide()

void QwtPlotItem::setXAxis ( int  axis  )  [inherited]

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:
axis X Axis
See also:
setAxes(), setYAxis(), xAxis()

void QwtPlotItem::setYAxis ( int  axis  )  [inherited]

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:
axis Y Axis
See also:
setAxes(), setXAxis(), yAxis()

void QwtPlotItem::setZ ( double  z  )  [inherited]

Set the z value.

Plot items are painted in increasing z-order.

Parameters:
z Z-value
See also:
z(), QwtPlotDict::itemList()

void QwtPlotItem::show (  )  [inherited]

Show the item.

QwtPlotCurve::CurveStyle QwtPlotCurve::style (  )  const

Return the current style

See also:
setStyle()

const QwtSymbol * QwtPlotCurve::symbol (  )  const

Returns:
Current symbol or NULL, when no symbol has been assigned
See also:
setSymbol()

bool QwtPlotCurve::testCurveAttribute ( CurveAttribute  attribute  )  const

Returns:
true, if attribute is enabled
See also:
setCurveAttribute()

bool QwtPlotItem::testItemAttribute ( ItemAttribute  attribute  )  const [inherited]

Test an item attribute

Parameters:
attribute Attribute type
Returns:
true/false
See also:
setItemAttribute(), ItemAttribute

bool QwtPlotCurve::testLegendAttribute ( LegendAttribute  attribute  )  const

Return the current paint attributes.

See also:
setLegendAttribute()

bool QwtPlotCurve::testPaintAttribute ( PaintAttribute  attribute  )  const

Return the current paint attributes.

See also:
setPaintAttribute()

bool QwtPlotItem::testRenderHint ( RenderHint  hint  )  const [inherited]

Test a render hint

Parameters:
hint Render hint
Returns:
true/false
See also:
setRenderHint(), RenderHint

const QwtText & QwtPlotItem::title (  )  const [inherited]

Returns:
Title of the item
See also:
setTitle()

void QwtPlotCurve::updateLegend ( QwtLegend legend  )  const [virtual]

Update the widget that represents the item on the legend.

Parameters:
legend Legend
See also:
drawLegendIdentifier(), legendItem(), QwtPlotItem::Legend

Reimplemented from QwtPlotItem.

virtual void QwtPlotSeriesItem< QPointF >::updateScaleDiv ( const QwtScaleDiv xScaleDiv,
const QwtScaleDiv yScaleDiv 
) [virtual, inherited]

Update the rect of interest according to the current scale ranges

Parameters:
xScaleDiv Scale division of the x-axis
yScaleDiv Scale division of the y-axis
See also:
QwtSeriesData<T>::setRectOfInterest()

Reimplemented from QwtPlotItem.

int QwtPlotItem::xAxis (  )  const [inherited]

Return xAxis.

int QwtPlotItem::yAxis (  )  const [inherited]

Return yAxis.

double QwtPlotItem::z (  )  const [inherited]

Plot items are painted in increasing z-order.

Returns:
setZ(), QwtPlotDict::itemList()


Member Data Documentation

QwtSeriesData<QPointF >* QwtPlotSeriesItem< QPointF >::d_series [protected, inherited]

Series.


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