Inheritance diagram for QwtPlotZoomer:
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.
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) |
void | moveBy (double x, double y) |
virtual void | move (double x, double y) |
virtual void | zoom (const QwtDoubleRect &) |
virtual void | zoom (int up) |
Protected Member Functions | |
void | zoomed (const QwtDoubleRect &rect) |
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.
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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.
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Create a zoomer for a plot 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. |
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Rejects selections, when the stack depth is too deep, or the zoomed rectangle is minZoomSize().
Reimplemented from QwtPicker. |
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Expand the selected rectangle to minZoomSize() and zoom in if accepted.
Reimplemented from QwtPlotPicker. |
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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.
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Move the the current zoom rectangle.
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Move the current zoom rectangle.
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Adjust the observed plot to zoomRect()
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Reinitialize the axes, and set the zoom base to their scales.
Reimplemented from QwtPlotPicker. |
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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.
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Set the selection flags
Reimplemented from QwtPicker. |
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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().
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Reinitialized the zoom stack with scaleRect() as base.
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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. |
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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. |
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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.
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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.
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A signal emitting the zoomRect(), when the plot has been zoomed in or out.
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Rectangle at the current position on the zoom stack.
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Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle. |
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Return the zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle. |