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/QwtEventPatternKeyUndo, or QwtEventPattern::MouseSelect6/QwtEventPatternKeyRedo 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.
Definition at line 49 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 *, bool doReplot=true) | |
QwtPlotZoomer (int xAxis, int yAxis, QwtPlotCanvas *, bool doReplot=true) | |
QwtPlotZoomer (int xAxis, int yAxis, int selectionFlags, DisplayMode trackerMode, QwtPlotCanvas *, bool doReplot=true) | |
virtual | ~QwtPlotZoomer () |
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 QStack< QwtDoubleRect > & | zoomStack () const |
uint | zoomRectIndex () const |
virtual void | setSelectionFlags (int) |
Protected Member Functions | |
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 (QwtPolygon &) 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 tracker mode to QwtPicker::ActiveOnly.
Definition at line 51 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::canvas(). |
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Create a zoomer for a plot canvas. The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the tracker mode to QwtPicker::ActiveOnly.
Definition at line 75 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::canvas(). |
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Create a zoomer for a plot canvas.
Definition at line 103 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::canvas(). |
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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 497 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 545 of file qwt_plot_zoomer.cpp. References minZoomSize(). |
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Expand the selected rectangle to minZoomSize() and zoom in if accepted.
Reimplemented from QwtPlotPicker. Definition at line 575 of file qwt_plot_zoomer.cpp. References QwtPlotPicker::end(), QwtPlotPicker::invTransform(), minZoomSize(), QwtPlotPicker::plot(), QwtPicker::selection(), zoom(), and zoomRect(). |
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Definition at line 172 of file qwt_plot_zoomer.cpp. |
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Limit zooming by a minimum rectangle.
Definition at line 531 of file qwt_plot_zoomer.cpp. |
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Move the the current zoom rectangle.
Definition at line 467 of file qwt_plot_zoomer.cpp. References rescale(), zoomBase(), and zoomRect(). Referenced by moveBy(). |
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Move the current zoom rectangle.
Definition at line 452 of file qwt_plot_zoomer.cpp. References move(). |
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Adjust the observed plot to zoomRect()
Definition at line 343 of file qwt_plot_zoomer.cpp. References QwtPlot::autoReplot(), QwtPlot::axisScaleDiv(), QwtScaleDiv::hBound(), QwtScaleDiv::lBound(), QwtPlotPicker::plot(), QwtPlotPicker::scaleRect(), QwtPlot::setAutoReplot(), QwtPlot::setAxisScale(), QwtPlotPicker::xAxis(), 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 387 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 145 of file qwt_plot_zoomer.cpp. References zoom(). |
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Set the selection flags
Reimplemented from QwtPicker. Definition at line 619 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 231 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 208 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 doesn't pop any rectangle.
Reimplemented from QwtPicker. Definition at line 429 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 doesn't pop any rectangle.
Reimplemented from QwtPicker. Definition at line 406 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 319 of file qwt_plot_zoomer.cpp. References rescale(), zoomed(), and zoomRect(). |
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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 282 of file qwt_plot_zoomer.cpp. References rescale(), zoomed(), and zoomRect(). Referenced by end(), setMaxStackDepth(), widgetKeyPressEvent(), and widgetMouseReleaseEvent(). |
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Definition at line 190 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 zoom(). |
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Rectangle at the current position on the zoom stack.
Definition at line 258 of file qwt_plot_zoomer.cpp. |
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Definition at line 266 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 181 of file qwt_plot_zoomer.cpp. |