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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