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# 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);
         }
     }