[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_LAYOUT_METRICS_H
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| 11 | #define QWT_LAYOUT_METRICS_H
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| 12 |
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| 13 | #include <qsize.h>
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| 14 | #include <qrect.h>
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| 15 | #include "qwt_polygon.h"
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| 16 | #include "qwt_global.h"
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| 17 |
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| 18 | class QPainter;
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| 19 | class QString;
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| 20 | class QFontMetrics;
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| 21 | #if QT_VERSION < 0x040000
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| 22 | class QWMatrix;
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| 23 | #else
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| 24 | class QMatrix;
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| 25 | #endif
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| 26 | class QPaintDevice;
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| 27 |
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| 28 | /*!
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| 29 | \brief A Map to translate between layout, screen and paint device metrics
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| 30 |
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| 31 | Qt3 supports painting in integer coordinates only. Therefore it is not
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| 32 | possible to scale the layout in screen coordinates to layouts in higher
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| 33 | resolutions ( f.e printing ) without losing the higher precision.
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| 34 | QwtMetricsMap is used to incorporate the various widget attributes
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| 35 | ( always in screen resolution ) into the layout/printing code of QwtPlot.
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| 36 |
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| 37 | Qt4 is able to paint floating point based coordinates, what makes it
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| 38 | possible always to render in screen coordinates
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| 39 | ( with a common scale factor ).
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| 40 | QwtMetricsMap will be obsolete as soon as Qt3 support has been
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| 41 | dropped ( Qwt 6.x ).
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| 42 | */
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| 43 | class QWT_EXPORT QwtMetricsMap
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| 44 | {
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| 45 | public:
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| 46 | QwtMetricsMap();
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| 47 |
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| 48 | bool isIdentity() const;
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| 49 |
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| 50 | void setMetrics(const QPaintDevice *layoutMetrics,
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| 51 | const QPaintDevice *deviceMetrics);
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| 52 |
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| 53 | int layoutToDeviceX(int x) const;
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| 54 | int deviceToLayoutX(int x) const;
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| 55 | int screenToLayoutX(int x) const;
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| 56 | int layoutToScreenX(int x) const;
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| 57 |
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| 58 | int layoutToDeviceY(int y) const;
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| 59 | int deviceToLayoutY(int y) const;
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| 60 | int screenToLayoutY(int y) const;
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| 61 | int layoutToScreenY(int y) const;
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| 62 |
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| 63 | QPoint layoutToDevice(const QPoint &, const QPainter * = NULL) const;
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| 64 | QPoint deviceToLayout(const QPoint &, const QPainter * = NULL) const;
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| 65 | QPoint screenToLayout(const QPoint &) const;
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| 66 | QPoint layoutToScreen(const QPoint &point) const;
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| 67 |
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| 68 |
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| 69 | QSize layoutToDevice(const QSize &) const;
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| 70 | QSize deviceToLayout(const QSize &) const;
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| 71 | QSize screenToLayout(const QSize &) const;
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| 72 | QSize layoutToScreen(const QSize &) const;
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| 73 |
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| 74 | QRect layoutToDevice(const QRect &, const QPainter * = NULL) const;
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| 75 | QRect deviceToLayout(const QRect &, const QPainter * = NULL) const;
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| 76 | QRect screenToLayout(const QRect &) const;
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| 77 | QRect layoutToScreen(const QRect &) const;
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| 78 |
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| 79 | QwtPolygon layoutToDevice(const QwtPolygon &,
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| 80 | const QPainter * = NULL) const;
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| 81 | QwtPolygon deviceToLayout(const QwtPolygon &,
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| 82 | const QPainter * = NULL) const;
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| 83 |
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| 84 | #if QT_VERSION < 0x040000
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| 85 | static QwtPolygon translate(const QWMatrix &, const QwtPolygon &);
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| 86 | static QRect translate(const QWMatrix &, const QRect &);
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| 87 | #else
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| 88 | static QwtPolygon translate(const QMatrix &, const QwtPolygon &);
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| 89 | static QRect translate(const QMatrix &, const QRect &);
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| 90 | #endif
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| 91 |
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| 92 | private:
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| 93 | double d_screenToLayoutX;
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| 94 | double d_screenToLayoutY;
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| 95 |
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| 96 | double d_deviceToLayoutX;
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| 97 | double d_deviceToLayoutY;
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| 98 | };
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| 99 |
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| 100 | inline bool QwtMetricsMap::isIdentity() const
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| 101 | {
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| 102 | return d_deviceToLayoutX == 1.0 && d_deviceToLayoutY == 1.0;
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| 103 | }
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| 104 |
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| 105 | inline int QwtMetricsMap::layoutToDeviceX(int x) const
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| 106 | {
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| 107 | return qRound(x / d_deviceToLayoutX);
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| 108 | }
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| 109 |
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| 110 | inline int QwtMetricsMap::deviceToLayoutX(int x) const
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| 111 | {
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| 112 | return qRound(x * d_deviceToLayoutX);
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| 113 | }
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| 114 |
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| 115 | inline int QwtMetricsMap::screenToLayoutX(int x) const
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| 116 | {
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| 117 | return qRound(x * d_screenToLayoutX);
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| 118 | }
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| 119 |
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| 120 | inline int QwtMetricsMap::layoutToScreenX(int x) const
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| 121 | {
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| 122 | return qRound(x / d_screenToLayoutX);
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| 123 | }
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| 124 |
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| 125 | inline int QwtMetricsMap::layoutToDeviceY(int y) const
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| 126 | {
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| 127 | return qRound(y / d_deviceToLayoutY);
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| 128 | }
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| 129 |
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| 130 | inline int QwtMetricsMap::deviceToLayoutY(int y) const
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| 131 | {
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| 132 | return qRound(y * d_deviceToLayoutY);
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| 133 | }
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| 134 |
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| 135 | inline int QwtMetricsMap::screenToLayoutY(int y) const
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| 136 | {
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| 137 | return qRound(y * d_screenToLayoutY);
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| 138 | }
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| 139 |
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| 140 | inline int QwtMetricsMap::layoutToScreenY(int y) const
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| 141 | {
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| 142 | return qRound(y / d_screenToLayoutY);
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| 143 | }
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| 144 |
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| 145 | inline QSize QwtMetricsMap::layoutToDevice(const QSize &size) const
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| 146 | {
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| 147 | return QSize(layoutToDeviceX(size.width()),
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| 148 | layoutToDeviceY(size.height()));
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| 149 | }
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| 150 |
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| 151 | inline QSize QwtMetricsMap::deviceToLayout(const QSize &size) const
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| 152 | {
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| 153 | return QSize(deviceToLayoutX(size.width()),
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| 154 | deviceToLayoutY(size.height()));
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| 155 | }
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| 156 |
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| 157 | inline QSize QwtMetricsMap::screenToLayout(const QSize &size) const
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| 158 | {
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| 159 | return QSize(screenToLayoutX(size.width()),
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| 160 | screenToLayoutY(size.height()));
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| 161 | }
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| 162 |
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| 163 | inline QSize QwtMetricsMap::layoutToScreen(const QSize &size) const
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| 164 | {
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| 165 | return QSize(layoutToScreenX(size.width()),
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| 166 | layoutToScreenY(size.height()));
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| 167 | }
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| 168 |
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| 169 | #endif
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