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