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);
 }