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# composition.h Example File
demos/composition/composition.h

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     #ifndef COMPOSITION_H
     #define COMPOSITION_H

     #include "arthurwidgets.h"

     #include <QPainter>
     #include <QEvent>

     QT_FORWARD_DECLARE_CLASS(QPushButton)
     QT_FORWARD_DECLARE_CLASS(QRadioButton)

     #ifdef QT_OPENGL_SUPPORT
     #include <QtOpenGL>
     #endif

     class CompositionWidget : public QWidget
     {
         Q_OBJECT

     public:
         CompositionWidget(QWidget *parent);

     public slots:
     void nextMode();

     private:
         bool m_cycle_enabled;

         QRadioButton *rbClear;
         QRadioButton *rbSource;
         QRadioButton *rbDest;
         QRadioButton *rbSourceOver;
         QRadioButton *rbDestOver;
         QRadioButton *rbSourceIn;
         QRadioButton *rbDestIn;
         QRadioButton *rbSourceOut;
         QRadioButton *rbDestOut;
         QRadioButton *rbSourceAtop;
         QRadioButton *rbDestAtop;
         QRadioButton *rbXor;

         QRadioButton *rbPlus;
         QRadioButton *rbMultiply;
         QRadioButton *rbScreen;
         QRadioButton *rbOverlay;
         QRadioButton *rbDarken;
         QRadioButton *rbLighten;
         QRadioButton *rbColorDodge;
         QRadioButton *rbColorBurn;
         QRadioButton *rbHardLight;
         QRadioButton *rbSoftLight;
         QRadioButton *rbDifference;
         QRadioButton *rbExclusion;
     };

     class CompositionRenderer : public ArthurFrame
     {
         Q_OBJECT

         enum ObjectType { NoObject, Circle, Rectangle, Image };

         Q_PROPERTY(int circleColor READ circleColor WRITE setCircleColor)
         Q_PROPERTY(int circleAlpha READ circleAlpha WRITE setCircleAlpha)
         Q_PROPERTY(bool animation READ animationEnabled WRITE setAnimationEnabled)

     public:
         CompositionRenderer(QWidget *parent);

         void paint(QPainter *);

         void mousePressEvent(QMouseEvent *);
         void mouseMoveEvent(QMouseEvent *);
         void mouseReleaseEvent(QMouseEvent *);

         void setCirclePos(const QPointF &pos);

         QSize sizeHint() const { return QSize(500, 400); }

         bool animationEnabled() const { return m_animation_enabled; }
         int circleColor() const { return m_circle_hue; }
         int circleAlpha() const { return m_circle_alpha; }

     public slots:
         void setClearMode() { m_composition_mode = QPainter::CompositionMode_Clear; update(); }
         void setSourceMode() { m_composition_mode = QPainter::CompositionMode_Source; update(); }
         void setDestMode() { m_composition_mode = QPainter::CompositionMode_Destination; update(); }
         void setSourceOverMode() { m_composition_mode = QPainter::CompositionMode_SourceOver; update(); }
         void setDestOverMode() { m_composition_mode = QPainter::CompositionMode_DestinationOver; update(); }
         void setSourceInMode() { m_composition_mode = QPainter::CompositionMode_SourceIn; update(); }
         void setDestInMode() { m_composition_mode = QPainter::CompositionMode_DestinationIn; update(); }
         void setSourceOutMode() { m_composition_mode = QPainter::CompositionMode_SourceOut; update(); }
         void setDestOutMode() { m_composition_mode = QPainter::CompositionMode_DestinationOut; update(); }
         void setSourceAtopMode() { m_composition_mode = QPainter::CompositionMode_SourceAtop; update(); }
         void setDestAtopMode() { m_composition_mode = QPainter::CompositionMode_DestinationAtop; update(); }
         void setXorMode() { m_composition_mode = QPainter::CompositionMode_Xor; update(); }

         void setPlusMode() { m_composition_mode = QPainter::CompositionMode_Plus; update(); }
         void setMultiplyMode() { m_composition_mode = QPainter::CompositionMode_Multiply; update(); }
         void setScreenMode() { m_composition_mode = QPainter::CompositionMode_Screen; update(); }
         void setOverlayMode() { m_composition_mode = QPainter::CompositionMode_Overlay; update(); }
         void setDarkenMode() { m_composition_mode = QPainter::CompositionMode_Darken; update(); }
         void setLightenMode() { m_composition_mode = QPainter::CompositionMode_Lighten; update(); }
         void setColorDodgeMode() { m_composition_mode = QPainter::CompositionMode_ColorDodge; update(); }
         void setColorBurnMode() { m_composition_mode = QPainter::CompositionMode_ColorBurn; update(); }
         void setHardLightMode() { m_composition_mode = QPainter::CompositionMode_HardLight; update(); }
         void setSoftLightMode() { m_composition_mode = QPainter::CompositionMode_SoftLight; update(); }
         void setDifferenceMode() { m_composition_mode = QPainter::CompositionMode_Difference; update(); }
         void setExclusionMode() { m_composition_mode = QPainter::CompositionMode_Exclusion; update(); }

         void setCircleAlpha(int alpha) { m_circle_alpha = alpha; update(); }
         void setCircleColor(int hue) { m_circle_hue = hue; update(); }
         void setAnimationEnabled(bool enabled) { m_animation_enabled = enabled; update(); }

     private:
         void updateCirclePos();
         void drawBase(QPainter &p);
         void drawSource(QPainter &p);

         QPainter::CompositionMode m_composition_mode;

     #ifdef Q_WS_QWS
         QPixmap m_image;
         QPixmap m_buffer;
         QPixmap m_base_buffer;
     #else
         QImage m_image;
         QImage m_buffer;
         QImage m_base_buffer;
     #endif

         int m_circle_alpha;
         int m_circle_hue;

         QPointF m_circle_pos;
         QPointF m_offset;

         ObjectType m_current_object;
         bool m_animation_enabled;

     #ifdef QT_OPENGL_SUPPORT
         QGLPixelBuffer *m_pbuffer;
         GLuint m_base_tex;
         GLuint m_compositing_tex;
         int m_pbuffer_size; // width==height==size of pbuffer
         QSize m_previous_size;
     #endif
     };

     #endif // COMPOSITION_H