context2d.h Example File
script/context2d/context2d.h
 #ifndef CONTEXT2D_H
 #define CONTEXT2D_H
 #include "domimage.h"
 #include <QPainter>
 #include <QPainterPath>
 #include <QString>
 #include <QStack>
 #include <QMetaType>
 #include <QTimerEvent>
 class CanvasGradient
 {
 public:
     CanvasGradient(const QGradient &v)
         : value(v) {}
     CanvasGradient() {}
     QGradient value;
 };
 Q_DECLARE_METATYPE(CanvasGradient)
 Q_DECLARE_METATYPE(CanvasGradient*)
 class ImageData {
 };
 class QContext2DCanvas;
 class Context2D : public QObject
 {
     Q_OBJECT
     
     Q_PROPERTY(qreal globalAlpha READ globalAlpha WRITE setGlobalAlpha)
     Q_PROPERTY(QString globalCompositeOperation READ globalCompositeOperation WRITE setGlobalCompositeOperation)
     Q_PROPERTY(QVariant strokeStyle READ strokeStyle WRITE setStrokeStyle)
     Q_PROPERTY(QVariant fillStyle READ fillStyle WRITE setFillStyle)
     
     Q_PROPERTY(qreal lineWidth READ lineWidth WRITE setLineWidth)
     Q_PROPERTY(QString lineCap READ lineCap WRITE setLineCap)
     Q_PROPERTY(QString lineJoin READ lineJoin WRITE setLineJoin)
     Q_PROPERTY(qreal miterLimit READ miterLimit WRITE setMiterLimit)
     
     Q_PROPERTY(qreal shadowOffsetX READ shadowOffsetX WRITE setShadowOffsetX)
     Q_PROPERTY(qreal shadowOffsetY READ shadowOffsetY WRITE setShadowOffsetY)
     Q_PROPERTY(qreal shadowBlur READ shadowBlur WRITE setShadowBlur)
     Q_PROPERTY(QString shadowColor READ shadowColor WRITE setShadowColor)
 public:
     Context2D(QObject *parent = 0);
     void setSize(int width, int height);
     void setSize(const QSize &size);
     QSize size() const;
     void clear();
     void reset();
     
     qreal globalAlpha() const; 
     QString globalCompositeOperation() const; 
     QVariant strokeStyle() const; 
     QVariant fillStyle() const; 
     void setGlobalAlpha(qreal alpha);
     void setGlobalCompositeOperation(const QString &op);
     void setStrokeStyle(const QVariant &style);
     void setFillStyle(const QVariant &style);
     
     qreal lineWidth() const; 
     QString lineCap() const; 
     QString lineJoin() const; 
     qreal miterLimit() const; 
     void setLineWidth(qreal w);
     void setLineCap(const QString &s);
     void setLineJoin(const QString &s);
     void setMiterLimit(qreal m);
     
     qreal shadowOffsetX() const; 
     qreal shadowOffsetY() const; 
     qreal shadowBlur() const; 
     QString shadowColor() const; 
     void setShadowOffsetX(qreal x);
     void setShadowOffsetY(qreal y);
     void setShadowBlur(qreal b);
     void setShadowColor(const QString &str);
 public slots:
     void save(); 
     void restore(); 
     void scale(qreal x, qreal y);
     void rotate(qreal angle);
     void translate(qreal x, qreal y);
     void transform(qreal m11, qreal m12, qreal m21, qreal m22,
                    qreal dx, qreal dy);
     void setTransform(qreal m11, qreal m12, qreal m21, qreal m22,
                       qreal dx, qreal dy);
     CanvasGradient createLinearGradient(qreal x0, qreal y0,
                                         qreal x1, qreal y1);
     CanvasGradient createRadialGradient(qreal x0, qreal y0,
                                         qreal r0, qreal x1,
                                         qreal y1, qreal r1);
     
     void clearRect(qreal x, qreal y, qreal w, qreal h);
     void fillRect(qreal x, qreal y, qreal w, qreal h);
     void strokeRect(qreal x, qreal y, qreal w, qreal h);
     
     void beginPath();
     void closePath();
     void moveTo(qreal x, qreal y);
     void lineTo(qreal x, qreal y);
     void quadraticCurveTo(qreal cpx, qreal cpy, qreal x, qreal y);
     void bezierCurveTo(qreal cp1x, qreal cp1y,
                        qreal cp2x, qreal cp2y, qreal x, qreal y);
     void arcTo(qreal x1, qreal y1, qreal x2, qreal y2, qreal radius);
     void rect(qreal x, qreal y, qreal w, qreal h);
     void arc(qreal x, qreal y, qreal radius,
              qreal startAngle, qreal endAngle,
              bool anticlockwise);
     void fill();
     void stroke();
     void clip();
     bool isPointInPath(qreal x, qreal y) const;
     
     void drawImage(DomImage *image, qreal dx, qreal dy);
     void drawImage(DomImage *image, qreal dx, qreal dy,
                    qreal dw, qreal dh);
     void drawImage(DomImage *image, qreal sx, qreal sy,
                    qreal sw, qreal sh, qreal dx, qreal dy,
                    qreal dw, qreal dh);
     
     ImageData getImageData(qreal sx, qreal sy, qreal sw, qreal sh);
     void putImageData(ImageData image, qreal dx, qreal dy);
 signals:
     void changed(const QImage &image);
 protected:
     void timerEvent(QTimerEvent *e);
 private:
     void beginPainting();
     const QImage &endPainting();
     void scheduleChange();
     int m_changeTimerId;
     QImage  m_image;
     QPainter m_painter;
     QPainterPath m_path;
     enum DirtyFlag {
         DirtyTransformationMatrix = 0x00001,
         DirtyClippingRegion       = 0x00002,
         DirtyStrokeStyle          = 0x00004,
         DirtyFillStyle            = 0x00008,
         DirtyGlobalAlpha          = 0x00010,
         DirtyLineWidth            = 0x00020,
         DirtyLineCap              = 0x00040,
         DirtyLineJoin             = 0x00080,
         DirtyMiterLimit           = 0x00100,
         MDirtyPen                 = DirtyStrokeStyle
                                   | DirtyLineWidth
                                   | DirtyLineCap
                                   | DirtyLineJoin
                                   | DirtyMiterLimit,
         DirtyShadowOffsetX        = 0x00200,
         DirtyShadowOffsetY        = 0x00400,
         DirtyShadowBlur           = 0x00800,
         DirtyShadowColor          = 0x01000,
         DirtyGlobalCompositeOperation = 0x2000,
         DirtyFont                 = 0x04000,
         DirtyTextAlign            = 0x08000,
         DirtyTextBaseline         = 0x10000,
         AllIsFullOfDirt           = 0xfffff
     };
     struct State {
         State() : flags(0) {}
         QMatrix matrix;
         QPainterPath clipPath;
         QBrush strokeStyle;
         QBrush fillStyle;
         qreal globalAlpha;
         qreal lineWidth;
         Qt::PenCapStyle lineCap;
         Qt::PenJoinStyle lineJoin;
         qreal miterLimit;
         qreal shadowOffsetX;
         qreal shadowOffsetY;
         qreal shadowBlur;
         QColor shadowColor;
         QPainter::CompositionMode globalCompositeOperation;
         QFont font;
         int textAlign;
         int textBaseline;
         int flags;
     };
     State m_state;
     QStack<State> m_stateStack;
 };
 #endif
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