| 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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