QwtPlotZoomer offers rubberband selections on the plot canvas, translating the selected rectangles into plot coordinates and adjusting the axes to them. Zooming can repeated as often as possible, limited only by maxStackDepth() or minZoomSize(). Each rectangle is pushed on a stack.
Zoom rectangles can be selected depending on selectionFlags() using the mouse or keyboard (QwtEventPattern, QwtPickerMachine). QwtEventPattern::MouseSelect3/QwtEventPattern::KeyUndo, or QwtEventPattern::MouseSelect6/QwtEventPattern::KeyRedo walk up and down the zoom stack. QwtEventPattern::MouseSelect2 or QwtEventPattern::KeyHome unzoom to the initial size.
QwtPlotZoomer is tailored for plots with one x and y axis, but it is allowed to attach a second QwtPlotZoomer for the other axes, even when one or both of them are disabled. In most situations it is recommended to disable rubber band and cursor label for one of the zoomers.
Definition at line 59 of file qwt_plot_zoomer.h.
Public Slots | |
void | moveBy (double x, double y) |
virtual void | move (double x, double y) |
virtual void | zoom (const QwtDoubleRect &) |
virtual void | zoom (int up) |
Signals | |
void | zoomed (const QwtDoubleRect &rect) |
Public Member Functions | |
QwtPlotZoomer (QwtPlotCanvas *, const char *name=0) | |
QwtPlotZoomer (int xAxis, int yAxis, QwtPlotCanvas *, const char *name=0) | |
QwtPlotZoomer (int xAxis, int yAxis, int selectionFlags, DisplayMode cursorLabelMode, QwtPlotCanvas *, const char *name=0) | |
virtual void | setZoomBase () |
virtual void | setZoomBase (const QwtDoubleRect &) |
QwtDoubleRect | zoomBase () const |
QwtDoubleRect | zoomRect () const |
virtual void | setAxis (int xAxis, int yAxis) |
void | setMaxStackDepth (int) |
int | maxStackDepth () const |
const QValueStack< QwtDoubleRect > & | zoomStack () const |
uint | zoomRectIndex () const |
virtual void | setSelectionFlags (int) |
Protected Member Functions | |
QValueStack< QwtDoubleRect > & | zoomStack () |
virtual void | rescale () |
virtual QwtDoubleSize | minZoomSize () const |
virtual void | widgetMouseReleaseEvent (QMouseEvent *) |
virtual void | widgetKeyPressEvent (QKeyEvent *) |
virtual void | begin () |
virtual bool | end (bool ok=TRUE) |
virtual bool | accept (QPointArray &) const |
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Create a zoomer for a plot canvas. The zoomer is set to those x- and y-axis of the parent plot of the canvas that are enabled. If both or no x-axis are enabled, the picker is set to QwtPlot::xBottom. If both or no y-axis are enabled, it is set to QwtPlot::yLeft. The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the cursor label mode to QwtPicker::ActiveOnly.
Definition at line 40 of file qwt_plot_zoomer.cpp. |
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Create a zoomer for a plot canvas. The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the cursor label mode to QwtPicker::ActiveOnly.
Definition at line 68 of file qwt_plot_zoomer.cpp. |
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Create a zoomer for a plot canvas.
Definition at line 102 of file qwt_plot_zoomer.cpp. |
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Check and correct a selected rectangle. Reject rectangles with a hight or width < 2, otherwise expand the selected rectangle to a minimum size of 11x11 and accept it.
Reimplemented from QwtPicker. Definition at line 456 of file qwt_plot_zoomer.cpp. References minZoomSize(). |
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Rejects selections, when the stack depth is too deep, or the zoomed rectangle is minZoomSize().
Reimplemented from QwtPicker. Definition at line 508 of file qwt_plot_zoomer.cpp. References QwtPicker::begin(), QwtDoubleSize::height(), QwtDoubleSize::isValid(), minZoomSize(), and QwtDoubleSize::width(). |
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Expand the selected rectangle to minZoomSize() and zoom in if accepted.
Reimplemented from QwtPlotPicker. Definition at line 539 of file qwt_plot_zoomer.cpp. References QwtDoubleRect::center(), QwtPlotPicker::end(), QwtDoubleSize::expandedTo(), QwtPlotPicker::invTransform(), minZoomSize(), QwtDoubleRect::moveCenter(), QwtDoubleRect::normalize(), QwtPlotPicker::plot(), QwtPicker::selection(), QwtDoubleRect::setSize(), QwtDoubleRect::size(), zoom(), zoomed(), and zoomRect(). |
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Definition at line 159 of file qwt_plot_zoomer.cpp. |
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Limit zooming by a minimum rectangle. Tries to stop zooming, when the precision of the axes label string conversion leads to identical values.
Definition at line 488 of file qwt_plot_zoomer.cpp. References QwtPlot::axisLabelFormat(), QwtPlotPicker::plot(), QwtPlotPicker::xAxis(), and QwtPlotPicker::yAxis(). |
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Move the the current zoom rectangle.
Definition at line 430 of file qwt_plot_zoomer.cpp. References rescale(), QwtDoubleRect::x1(), QwtDoubleRect::y1(), zoomBase(), and zoomRect(). Referenced by moveBy(). |
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Move the current zoom rectangle.
Definition at line 415 of file qwt_plot_zoomer.cpp. References move(), QwtDoubleRect::x1(), and QwtDoubleRect::y1(). |
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Adjust the observed plot to zoomRect()
Definition at line 327 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::plot(), QwtPlot::replot(), QwtPlotPicker::scaleRect(), QwtPlot::setAxisScale(), QwtDoubleRect::x1(), QwtDoubleRect::x2(), QwtPlotPicker::xAxis(), QwtDoubleRect::y1(), QwtDoubleRect::y2(), and QwtPlotPicker::yAxis(). Referenced by move(), setZoomBase(), and zoom(). |
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Reinitialize the axes, and set the zoom base to their scales.
Reimplemented from QwtPlotPicker. Definition at line 350 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::scaleRect(), QwtPlotPicker::setAxis(), setZoomBase(), QwtPlotPicker::xAxis(), and QwtPlotPicker::yAxis(). |
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Limit the number of recursive zoom operations to depth. A value of -1 set the depth to unlimited, 0 disables zooming. If the current zoom rectangle is below depth, the plot is unzoomed.
Definition at line 135 of file qwt_plot_zoomer.cpp. References zoom(). |
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Set the selection flags
Reimplemented from QwtPicker. Definition at line 578 of file qwt_plot_zoomer.cpp. References QwtPicker::setSelectionFlags(). |
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Set the initial size of the zoomer. base is united with the current scaleRect() and the zoom stack is reinitalized with it as zoom base. plot is zoomed to scaleRect().
Definition at line 227 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::plot(), rescale(), and QwtPlotPicker::scaleRect(). |
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Reinitialized the zoom stack with scaleRect() as base.
Definition at line 204 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::plot(), rescale(), and QwtPlotPicker::scaleRect(). Referenced by setAxis(). |
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Qt::Key_Plus zooms out, Qt::Key_Minus zooms in one position on the zoom stack, Qt::Key_Escape zooms out to the zoom base. Changes the current position on the stack, but doesnīt pop any rectangle.
Reimplemented from QwtPicker. Definition at line 392 of file qwt_plot_zoomer.cpp. References QwtPicker::isActive(), QwtEventPattern::keyMatch(), QwtPicker::widgetKeyPressEvent(), and zoom(). |
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Qt::MidButton zooms out one position on the zoom stack, Qt::RightButton to the zoom base. Changes the current position on the stack, but doesnīt pop any rectangle.
Reimplemented from QwtPicker. Definition at line 369 of file qwt_plot_zoomer.cpp. References QwtEventPattern::mouseMatch(), QwtPicker::widgetMouseReleaseEvent(), and zoom(). |
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Zoom in or out. Activate a rectangle on the zoom stack with an offset relative to the current position. Negative values of offest will zoom out, positive zoom in. A value of 0 zooms out to the zoom base.
Definition at line 305 of file qwt_plot_zoomer.cpp. References rescale(). |
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Zoom in. Clears all rectangles above the current position of the zoom stack and pushs the intersection of zoomRect() and the normalized rect on it.
Definition at line 277 of file qwt_plot_zoomer.cpp. References QwtDoubleRect::normalize(), rescale(), and zoomRect(). Referenced by end(), setMaxStackDepth(), widgetKeyPressEvent(), and widgetMouseReleaseEvent(). |
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Definition at line 186 of file qwt_plot_zoomer.cpp. Referenced by move(). |
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A signal emitting the zoomRect(), when the plot has been zoomed in or out.
Referenced by end(). |
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Rectangle at the current position on the zoom stack.
Definition at line 254 of file qwt_plot_zoomer.cpp. |
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Definition at line 262 of file qwt_plot_zoomer.cpp. |
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Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle. Definition at line 177 of file qwt_plot_zoomer.cpp. |
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Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle. Definition at line 168 of file qwt_plot_zoomer.cpp. |