/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at qt-sales@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef CONTEXT2D_H #define CONTEXT2D_H #include "domimage.h" #include #include #include #include #include #include // [3] class CanvasGradient { public: CanvasGradient(const QGradient &v) : value(v) {} CanvasGradient() {} QGradient value; }; // [3] Q_DECLARE_METATYPE(CanvasGradient) Q_DECLARE_METATYPE(CanvasGradient*) class ImageData { }; class QContext2DCanvas; //! [0] class Context2D : public QObject { Q_OBJECT // compositing 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) // line caps/joins 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) // shadows 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) //! [0] public: Context2D(QObject *parent = 0); void setSize(int width, int height); void setSize(const QSize &size); QSize size() const; void clear(); void reset(); // compositing qreal globalAlpha() const; // (default 1.0) QString globalCompositeOperation() const; // (default over) QVariant strokeStyle() const; // (default black) QVariant fillStyle() const; // (default black) void setGlobalAlpha(qreal alpha); void setGlobalCompositeOperation(const QString &op); void setStrokeStyle(const QVariant &style); void setFillStyle(const QVariant &style); // line caps/joins qreal lineWidth() const; // (default 1) QString lineCap() const; // "butt", "round", "square" (default "butt") QString lineJoin() const; // "round", "bevel", "miter" (default "miter") qreal miterLimit() const; // (default 10) void setLineWidth(qreal w); void setLineCap(const QString &s); void setLineJoin(const QString &s); void setMiterLimit(qreal m); // shadows qreal shadowOffsetX() const; // (default 0) qreal shadowOffsetY() const; // (default 0) qreal shadowBlur() const; // (default 0) QString shadowColor() const; // (default black) void setShadowOffsetX(qreal x); void setShadowOffsetY(qreal y); void setShadowBlur(qreal b); void setShadowColor(const QString &str); //! [1] public slots: void save(); // push state on state stack void restore(); // pop state stack and restore state 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); // rects 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); // path API 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; //! [1] // drawing images 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); // pixel manipulation ImageData getImageData(qreal sx, qreal sy, qreal sw, qreal sh); void putImageData(ImageData image, qreal dx, qreal dy); //! [2] signals: void changed(const QImage &image); //! [2] 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 m_stateStack; }; #endif