animation.cpp Example File
animation/stickman/animation.cpp

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 #include "animation.h"

 #include <QPointF>
 #include <QIODevice>
 #include <QDataStream>

 class Frame
 {
 public:
     Frame() {
     }

     int nodeCount() const
     {
         return m_nodePositions.size();
     }

     void setNodeCount(int nodeCount)
     {
         while (nodeCount > m_nodePositions.size())
             m_nodePositions.append(QPointF());

         while (nodeCount < m_nodePositions.size())
             m_nodePositions.removeLast();
     }

     QPointF nodePos(int idx) const
     {
         return m_nodePositions.at(idx);
     }

     void setNodePos(int idx, const QPointF &pos)
     {
         m_nodePositions[idx] = pos;
     }

 private:
     QList<QPointF> m_nodePositions;
 };

 Animation::Animation()
 {
     m_currentFrame = 0;
     m_frames.append(new Frame);
 }

 Animation::~Animation()
 {
     qDeleteAll(m_frames);
 }

 void Animation::setTotalFrames(int totalFrames)
 {
     while (m_frames.size() < totalFrames)
         m_frames.append(new Frame);

     while (totalFrames < m_frames.size())
         delete m_frames.takeLast();
 }

 int Animation::totalFrames() const
 {
     return m_frames.size();
 }

 void Animation::setCurrentFrame(int currentFrame)
 {
     m_currentFrame = qMax(qMin(currentFrame, totalFrames()-1), 0);
 }

 int Animation::currentFrame() const
 {
     return m_currentFrame;
 }

 void Animation::setNodeCount(int nodeCount)
 {
     Frame *frame = m_frames.at(m_currentFrame);
     frame->setNodeCount(nodeCount);
 }

 int Animation::nodeCount() const
 {
     Frame *frame = m_frames.at(m_currentFrame);
     return frame->nodeCount();
 }

 void Animation::setNodePos(int idx, const QPointF &pos)
 {
     Frame *frame = m_frames.at(m_currentFrame);
     frame->setNodePos(idx, pos);
 }

 QPointF Animation::nodePos(int idx) const
 {
     Frame *frame = m_frames.at(m_currentFrame);
     return frame->nodePos(idx);
 }

 QString Animation::name() const
 {
     return m_name;
 }

 void Animation::setName(const QString &name)
 {
     m_name = name;
 }

 void Animation::save(QIODevice *device) const
 {
     QDataStream stream(device);
     stream << m_name;
     stream << m_frames.size();
     foreach (Frame *frame, m_frames) {
         stream << frame->nodeCount();
         for (int i=0; i<frame->nodeCount(); ++i)
             stream << frame->nodePos(i);
     }
 }

 void Animation::load(QIODevice *device)
 {
     if (!m_frames.isEmpty())
         qDeleteAll(m_frames);

     m_frames.clear();

     QDataStream stream(device);
     stream >> m_name;

     int frameCount;
     stream >> frameCount;

     for (int i=0; i<frameCount; ++i) {

         int nodeCount;
         stream >> nodeCount;

         Frame *frame = new Frame;
         frame->setNodeCount(nodeCount);

         for (int j=0; j<nodeCount; ++j) {
             QPointF pos;
             stream >> pos;

             frame->setNodePos(j, pos);
         }

         m_frames.append(frame);
     }
 }