Qt 4.4: animateditem.cpp Example File (graphicsview/portedasteroids/animateditem.cpp)

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# animateditem.cpp Example File
graphicsview/portedasteroids/animateditem.cpp

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     #include "animateditem.h"

     #include <QtGui/qbitmap.h>
     #include <QtGui/qpainter.h>

     AnimatedPixmapItem::AnimatedPixmapItem(const QList<QPixmap> &animation,
                                            QGraphicsScene *scene)
         : QGraphicsItem(0, scene), currentFrame(0), vx(0), vy(0)
     {
         for (int i = 0; i < animation.size(); ++i) {
             QPixmap pixmap = animation.at(i);
             Frame frame;
             frame.pixmap = pixmap;
             frame.shape = QPainterPath();
             frame.boundingRect = pixmap.rect();
             frames << frame;
         }
     }

     void AnimatedPixmapItem::setFrame(int frame)
     {
         if (!frames.isEmpty()) {
             prepareGeometryChange();
             currentFrame = frame % frames.size();
         }
     }

     void AnimatedPixmapItem::advance(int phase)
     {
         if (phase == 1)
             moveBy(vx, vy);
     }

     QRectF AnimatedPixmapItem::boundingRect() const
     {
         return frames.at(currentFrame).boundingRect;
     }

     QPainterPath AnimatedPixmapItem::shape() const
     {
         const Frame &f = frames.at(currentFrame);
         if (f.shape.isEmpty()) {
             QPainterPath path;
             path.addRegion(f.pixmap.createHeuristicMask());
             const_cast<Frame &>(f).shape = path;
         }
         return f.shape;
     }

     void AnimatedPixmapItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/,
                                    QWidget * /*widget*/)
     {
         painter->drawPixmap(0, 0, frames.at(currentFrame).pixmap);
     }