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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #ifndef CONTEXT2D_H |
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43 #define CONTEXT2D_H |
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44 |
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45 #include "domimage.h" |
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46 |
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47 #include <QPainter> |
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48 #include <QPainterPath> |
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49 #include <QString> |
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50 #include <QStack> |
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51 #include <QMetaType> |
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52 #include <QTimerEvent> |
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53 |
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54 // [3] |
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55 class CanvasGradient |
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56 { |
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57 public: |
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58 CanvasGradient(const QGradient &v) |
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59 : value(v) {} |
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60 CanvasGradient() {} |
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61 |
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62 QGradient value; |
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63 }; |
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64 // [3] |
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65 |
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66 Q_DECLARE_METATYPE(CanvasGradient) |
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67 Q_DECLARE_METATYPE(CanvasGradient*) |
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68 |
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69 class ImageData { |
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70 }; |
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71 |
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72 class QContext2DCanvas; |
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73 |
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74 //! [0] |
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75 class Context2D : public QObject |
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76 { |
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77 Q_OBJECT |
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78 // compositing |
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79 Q_PROPERTY(qreal globalAlpha READ globalAlpha WRITE setGlobalAlpha) |
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80 Q_PROPERTY(QString globalCompositeOperation READ globalCompositeOperation WRITE setGlobalCompositeOperation) |
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81 Q_PROPERTY(QVariant strokeStyle READ strokeStyle WRITE setStrokeStyle) |
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82 Q_PROPERTY(QVariant fillStyle READ fillStyle WRITE setFillStyle) |
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83 // line caps/joins |
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84 Q_PROPERTY(qreal lineWidth READ lineWidth WRITE setLineWidth) |
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85 Q_PROPERTY(QString lineCap READ lineCap WRITE setLineCap) |
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86 Q_PROPERTY(QString lineJoin READ lineJoin WRITE setLineJoin) |
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87 Q_PROPERTY(qreal miterLimit READ miterLimit WRITE setMiterLimit) |
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88 // shadows |
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89 Q_PROPERTY(qreal shadowOffsetX READ shadowOffsetX WRITE setShadowOffsetX) |
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90 Q_PROPERTY(qreal shadowOffsetY READ shadowOffsetY WRITE setShadowOffsetY) |
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91 Q_PROPERTY(qreal shadowBlur READ shadowBlur WRITE setShadowBlur) |
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92 Q_PROPERTY(QString shadowColor READ shadowColor WRITE setShadowColor) |
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93 //! [0] |
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94 |
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95 public: |
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96 Context2D(QObject *parent = 0); |
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97 void setSize(int width, int height); |
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98 void setSize(const QSize &size); |
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99 QSize size() const; |
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100 |
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101 void clear(); |
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102 void reset(); |
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103 |
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104 // compositing |
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105 qreal globalAlpha() const; // (default 1.0) |
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106 QString globalCompositeOperation() const; // (default over) |
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107 QVariant strokeStyle() const; // (default black) |
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108 QVariant fillStyle() const; // (default black) |
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109 |
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110 void setGlobalAlpha(qreal alpha); |
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111 void setGlobalCompositeOperation(const QString &op); |
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112 void setStrokeStyle(const QVariant &style); |
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113 void setFillStyle(const QVariant &style); |
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114 |
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115 // line caps/joins |
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116 qreal lineWidth() const; // (default 1) |
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117 QString lineCap() const; // "butt", "round", "square" (default "butt") |
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118 QString lineJoin() const; // "round", "bevel", "miter" (default "miter") |
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119 qreal miterLimit() const; // (default 10) |
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120 |
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121 void setLineWidth(qreal w); |
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122 void setLineCap(const QString &s); |
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123 void setLineJoin(const QString &s); |
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124 void setMiterLimit(qreal m); |
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125 |
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126 // shadows |
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127 qreal shadowOffsetX() const; // (default 0) |
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128 qreal shadowOffsetY() const; // (default 0) |
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129 qreal shadowBlur() const; // (default 0) |
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130 QString shadowColor() const; // (default black) |
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131 |
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132 void setShadowOffsetX(qreal x); |
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133 void setShadowOffsetY(qreal y); |
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134 void setShadowBlur(qreal b); |
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135 void setShadowColor(const QString &str); |
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136 |
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137 //! [1] |
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138 public slots: |
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139 void save(); // push state on state stack |
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140 void restore(); // pop state stack and restore state |
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141 |
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142 void scale(qreal x, qreal y); |
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143 void rotate(qreal angle); |
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144 void translate(qreal x, qreal y); |
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145 void transform(qreal m11, qreal m12, qreal m21, qreal m22, |
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146 qreal dx, qreal dy); |
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147 void setTransform(qreal m11, qreal m12, qreal m21, qreal m22, |
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148 qreal dx, qreal dy); |
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149 |
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150 CanvasGradient createLinearGradient(qreal x0, qreal y0, |
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151 qreal x1, qreal y1); |
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152 CanvasGradient createRadialGradient(qreal x0, qreal y0, |
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153 qreal r0, qreal x1, |
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154 qreal y1, qreal r1); |
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155 |
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156 // rects |
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157 void clearRect(qreal x, qreal y, qreal w, qreal h); |
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158 void fillRect(qreal x, qreal y, qreal w, qreal h); |
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159 void strokeRect(qreal x, qreal y, qreal w, qreal h); |
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160 |
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161 // path API |
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162 void beginPath(); |
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163 void closePath(); |
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164 void moveTo(qreal x, qreal y); |
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165 void lineTo(qreal x, qreal y); |
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166 void quadraticCurveTo(qreal cpx, qreal cpy, qreal x, qreal y); |
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167 void bezierCurveTo(qreal cp1x, qreal cp1y, |
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168 qreal cp2x, qreal cp2y, qreal x, qreal y); |
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169 void arcTo(qreal x1, qreal y1, qreal x2, qreal y2, qreal radius); |
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170 void rect(qreal x, qreal y, qreal w, qreal h); |
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171 void arc(qreal x, qreal y, qreal radius, |
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172 qreal startAngle, qreal endAngle, |
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173 bool anticlockwise); |
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174 void fill(); |
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175 void stroke(); |
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176 void clip(); |
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177 bool isPointInPath(qreal x, qreal y) const; |
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178 //! [1] |
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179 |
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180 // drawing images |
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181 void drawImage(DomImage *image, qreal dx, qreal dy); |
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182 void drawImage(DomImage *image, qreal dx, qreal dy, |
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183 qreal dw, qreal dh); |
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184 void drawImage(DomImage *image, qreal sx, qreal sy, |
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185 qreal sw, qreal sh, qreal dx, qreal dy, |
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186 qreal dw, qreal dh); |
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187 |
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188 // pixel manipulation |
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189 ImageData getImageData(qreal sx, qreal sy, qreal sw, qreal sh); |
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190 void putImageData(ImageData image, qreal dx, qreal dy); |
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191 |
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192 //! [2] |
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193 signals: |
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194 void changed(const QImage &image); |
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195 //! [2] |
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196 |
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197 protected: |
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198 void timerEvent(QTimerEvent *e); |
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199 |
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200 private: |
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201 void beginPainting(); |
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202 const QImage &endPainting(); |
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203 void scheduleChange(); |
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204 |
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205 int m_changeTimerId; |
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206 QImage m_image; |
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207 QPainter m_painter; |
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208 QPainterPath m_path; |
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209 |
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210 enum DirtyFlag { |
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211 DirtyTransformationMatrix = 0x00001, |
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212 DirtyClippingRegion = 0x00002, |
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213 DirtyStrokeStyle = 0x00004, |
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214 DirtyFillStyle = 0x00008, |
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215 DirtyGlobalAlpha = 0x00010, |
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216 DirtyLineWidth = 0x00020, |
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217 DirtyLineCap = 0x00040, |
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218 DirtyLineJoin = 0x00080, |
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219 DirtyMiterLimit = 0x00100, |
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220 MDirtyPen = DirtyStrokeStyle |
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221 | DirtyLineWidth |
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222 | DirtyLineCap |
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223 | DirtyLineJoin |
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224 | DirtyMiterLimit, |
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225 DirtyShadowOffsetX = 0x00200, |
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226 DirtyShadowOffsetY = 0x00400, |
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227 DirtyShadowBlur = 0x00800, |
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228 DirtyShadowColor = 0x01000, |
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229 DirtyGlobalCompositeOperation = 0x2000, |
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230 DirtyFont = 0x04000, |
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231 DirtyTextAlign = 0x08000, |
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232 DirtyTextBaseline = 0x10000, |
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233 AllIsFullOfDirt = 0xfffff |
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234 }; |
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235 |
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236 struct State { |
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237 State() : flags(0) {} |
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238 QMatrix matrix; |
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239 QPainterPath clipPath; |
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240 QBrush strokeStyle; |
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241 QBrush fillStyle; |
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242 qreal globalAlpha; |
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243 qreal lineWidth; |
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244 Qt::PenCapStyle lineCap; |
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245 Qt::PenJoinStyle lineJoin; |
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246 qreal miterLimit; |
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247 qreal shadowOffsetX; |
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248 qreal shadowOffsetY; |
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249 qreal shadowBlur; |
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250 QColor shadowColor; |
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251 QPainter::CompositionMode globalCompositeOperation; |
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252 QFont font; |
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253 int textAlign; |
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254 int textBaseline; |
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255 int flags; |
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256 }; |
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257 State m_state; |
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258 QStack<State> m_stateStack; |
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259 }; |
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260 |
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261 #endif |