[89] | 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_RESCALER_H
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| 11 | #define QWT_PLOT_RESCALER_H 1
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #include "qwt_double_rect.h"
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| 15 | #include "qwt_double_interval.h"
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| 16 | #include "qwt_plot.h"
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| 17 | #include <qobject.h>
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| 18 |
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| 19 | class QwtPlotCanvas;
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| 20 | class QResizeEvent;
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| 21 |
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| 22 | /*!
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| 23 | \brief QwtPlotRescaler takes care of fixed aspect ratios for plot scales
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| 24 |
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| 25 | QwtPlotRescaler autoadjusts the axes of a QwtPlot according
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| 26 | to fixed aspect ratios.
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| 27 | */
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| 28 |
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| 29 | class QWT_EXPORT QwtPlotRescaler: public QObject
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| 30 | {
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| 31 | public:
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| 32 | /*!
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| 33 | \brief Rescale Policy
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| 34 |
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| 35 | The rescale policy defines how to rescale the reference axis and
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| 36 | their depending axes.
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| 37 |
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| 38 | - Fixed
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| 39 |
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| 40 | The interval of the reference axis remains unchanged, when the
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| 41 | geometry of the canvas changes. All other axes
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| 42 | will be adjusted according to their aspect ratio.
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| 43 |
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| 44 | - Expanding
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| 45 |
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| 46 | The interval of the reference axis will be shrinked/expanded,
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| 47 | when the geometry of the canvas changes. All other axes
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| 48 | will be adjusted according to their aspect ratio.
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| 49 |
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| 50 | The interval, that is represented by one pixel is fixed.
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| 51 |
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| 52 | - Fitting
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| 53 |
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| 54 | The intervals of the axes are calculated, so that all axes include
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| 55 | their minimal interval.
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| 56 | */
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| 57 |
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| 58 | enum RescalePolicy
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| 59 | {
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| 60 | Fixed,
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| 61 | Expanding,
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| 62 | Fitting
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| 63 | };
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| 64 |
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| 65 | enum ExpandingDirection
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| 66 | {
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| 67 | ExpandUp,
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| 68 | ExpandDown,
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| 69 | ExpandBoth
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| 70 | };
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| 71 |
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| 72 | explicit QwtPlotRescaler(QwtPlotCanvas *,
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| 73 | int referenceAxis = QwtPlot::xBottom,
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| 74 | RescalePolicy = Expanding );
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| 75 |
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| 76 | virtual ~QwtPlotRescaler();
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| 77 |
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| 78 | void setEnabled(bool);
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| 79 | bool isEnabled() const;
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| 80 |
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| 81 | void setRescalePolicy(RescalePolicy);
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| 82 | RescalePolicy rescalePolicy() const;
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| 83 |
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| 84 | void setExpandingDirection(ExpandingDirection);
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| 85 | void setExpandingDirection(int axis, ExpandingDirection);
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| 86 | ExpandingDirection expandingDirection(int axis) const;
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| 87 |
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| 88 | void setReferenceAxis(int axis);
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| 89 | int referenceAxis() const;
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| 90 |
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| 91 | void setAspectRatio(double ratio);
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| 92 | void setAspectRatio(int axis, double ratio);
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| 93 | double aspectRatio(int axis) const;
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| 94 |
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| 95 | void setIntervalHint(int axis, const QwtDoubleInterval&);
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| 96 | QwtDoubleInterval intervalHint(int axis) const;
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| 97 |
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| 98 | QwtPlotCanvas *canvas();
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| 99 | const QwtPlotCanvas *canvas() const;
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| 100 |
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| 101 | QwtPlot *plot();
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| 102 | const QwtPlot *plot() const;
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| 103 |
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| 104 | virtual bool eventFilter(QObject *, QEvent *);
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| 105 |
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| 106 | void rescale() const;
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| 107 |
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| 108 | protected:
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| 109 | virtual void canvasResizeEvent(QResizeEvent *);
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| 110 |
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| 111 | virtual void rescale(const QSize &oldSize, const QSize &newSize) const;
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| 112 | virtual QwtDoubleInterval expandScale( int axis,
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| 113 | const QSize &oldSize, const QSize &newSize) const;
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| 114 |
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| 115 | virtual QwtDoubleInterval syncScale(
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| 116 | int axis, const QwtDoubleInterval& reference,
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| 117 | const QSize &size) const;
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| 118 |
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| 119 | virtual void updateScales(
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| 120 | QwtDoubleInterval intervals[QwtPlot::axisCnt]) const;
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| 121 |
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| 122 | Qt::Orientation orientation(int axis) const;
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| 123 | QwtDoubleInterval interval(int axis) const;
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| 124 | QwtDoubleInterval expandInterval(const QwtDoubleInterval &,
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| 125 | double width, ExpandingDirection) const;
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| 126 |
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| 127 | private:
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| 128 | double pixelDist(int axis, const QSize &) const;
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| 129 |
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| 130 | class AxisData;
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| 131 | class PrivateData;
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| 132 | PrivateData *d_data;
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| 133 | };
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| 134 |
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| 135 | #endif
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