| [4271] | 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
|
|---|
| 2 | * Qwt Widget Library
|
|---|
| 3 | * Copyright (C) 1997 Josef Wilgen
|
|---|
| 4 | * Copyright (C) 2002 Uwe Rathmann
|
|---|
| 5 | *
|
|---|
| 6 | * This library is free software; you can redistribute it and/or
|
|---|
| 7 | * modify it under the terms of the Qwt License, Version 1.0
|
|---|
| 8 | *****************************************************************************/
|
|---|
| 9 |
|
|---|
| 10 | #ifndef QWT_PLOT_ZOOMER_H
|
|---|
| 11 | #define QWT_PLOT_ZOOMER_H
|
|---|
| 12 |
|
|---|
| 13 | #include "qwt_global.h"
|
|---|
| 14 | #include "qwt_plot_picker.h"
|
|---|
| 15 | #include <qstack.h>
|
|---|
| 16 |
|
|---|
| 17 | /*!
|
|---|
| 18 | \brief QwtPlotZoomer provides stacked zooming for a plot widget
|
|---|
| 19 |
|
|---|
| 20 | QwtPlotZoomer offers rubberband selections on the plot canvas,
|
|---|
| 21 | translating the selected rectangles into plot coordinates and
|
|---|
| 22 | adjusting the axes to them. Zooming can repeated as often as
|
|---|
| 23 | possible, limited only by maxStackDepth() or minZoomSize().
|
|---|
| 24 | Each rectangle is pushed on a stack.
|
|---|
| 25 |
|
|---|
| 26 | Zoom rectangles can be selected depending on selectionFlags() using the
|
|---|
| 27 | mouse or keyboard (QwtEventPattern, QwtPickerMachine).
|
|---|
| 28 | QwtEventPattern::MouseSelect3,QwtEventPattern::KeyUndo,
|
|---|
| 29 | or QwtEventPattern::MouseSelect6,QwtEventPattern::KeyRedo
|
|---|
| 30 | walk up and down the zoom stack.
|
|---|
| 31 | QwtEventPattern::MouseSelect2 or QwtEventPattern::KeyHome unzoom to
|
|---|
| 32 | the initial size.
|
|---|
| 33 |
|
|---|
| 34 | QwtPlotZoomer is tailored for plots with one x and y axis, but it is
|
|---|
| 35 | allowed to attach a second QwtPlotZoomer for the other axes.
|
|---|
| 36 |
|
|---|
| 37 | \note The realtime example includes an derived zoomer class that adds
|
|---|
| 38 | scrollbars to the plot canvas.
|
|---|
| 39 | */
|
|---|
| 40 |
|
|---|
| 41 | class QWT_EXPORT QwtPlotZoomer: public QwtPlotPicker
|
|---|
| 42 | {
|
|---|
| 43 | Q_OBJECT
|
|---|
| 44 | public:
|
|---|
| 45 | explicit QwtPlotZoomer( QwtPlotCanvas *, bool doReplot = true );
|
|---|
| 46 | explicit QwtPlotZoomer( int xAxis, int yAxis,
|
|---|
| 47 | QwtPlotCanvas *, bool doReplot = true );
|
|---|
| 48 |
|
|---|
| 49 | virtual ~QwtPlotZoomer();
|
|---|
| 50 |
|
|---|
| 51 | virtual void setZoomBase( bool doReplot = true );
|
|---|
| 52 | virtual void setZoomBase( const QRectF & );
|
|---|
| 53 |
|
|---|
| 54 | QRectF zoomBase() const;
|
|---|
| 55 | QRectF zoomRect() const;
|
|---|
| 56 |
|
|---|
| 57 | virtual void setAxis( int xAxis, int yAxis );
|
|---|
| 58 |
|
|---|
| 59 | void setMaxStackDepth( int );
|
|---|
| 60 | int maxStackDepth() const;
|
|---|
| 61 |
|
|---|
| 62 | const QStack<QRectF> &zoomStack() const;
|
|---|
| 63 | void setZoomStack( const QStack<QRectF> &,
|
|---|
| 64 | int zoomRectIndex = -1 );
|
|---|
| 65 |
|
|---|
| 66 | uint zoomRectIndex() const;
|
|---|
| 67 |
|
|---|
| 68 | public Q_SLOTS:
|
|---|
| 69 | void moveBy( double x, double y );
|
|---|
| 70 | virtual void moveTo( const QPointF & );
|
|---|
| 71 |
|
|---|
| 72 | virtual void zoom( const QRectF & );
|
|---|
| 73 | virtual void zoom( int up );
|
|---|
| 74 |
|
|---|
| 75 | Q_SIGNALS:
|
|---|
| 76 | /*!
|
|---|
| 77 | A signal emitting the zoomRect(), when the plot has been
|
|---|
| 78 | zoomed in or out.
|
|---|
| 79 |
|
|---|
| 80 | \param rect Current zoom rectangle.
|
|---|
| 81 | */
|
|---|
| 82 |
|
|---|
| 83 | void zoomed( const QRectF &rect );
|
|---|
| 84 |
|
|---|
| 85 | protected:
|
|---|
| 86 | virtual void rescale();
|
|---|
| 87 |
|
|---|
| 88 | virtual QSizeF minZoomSize() const;
|
|---|
| 89 |
|
|---|
| 90 | virtual void widgetMouseReleaseEvent( QMouseEvent * );
|
|---|
| 91 | virtual void widgetKeyPressEvent( QKeyEvent * );
|
|---|
| 92 |
|
|---|
| 93 | virtual void begin();
|
|---|
| 94 | virtual bool end( bool ok = true );
|
|---|
| 95 | virtual bool accept( QPolygon & ) const;
|
|---|
| 96 |
|
|---|
| 97 | private:
|
|---|
| 98 | void init( bool doReplot );
|
|---|
| 99 |
|
|---|
| 100 | class PrivateData;
|
|---|
| 101 | PrivateData *d_data;
|
|---|
| 102 | };
|
|---|
| 103 |
|
|---|
| 104 | #endif
|
|---|
