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