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# cube.h Example File
opengl/pbuffers/cube.h

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     #ifndef CUBE_H
     #define CUBE_H

     #include <QtOpenGL/qgl.h>
     #include <QtCore/qvector.h>
     #include <QtGui/qmatrix4x4.h>
     #include <QtGui/qvector3d.h>
     #include <QtGui/qvector2d.h>

     class QPropertyAnimation;

     class Geometry
     {
     public:
         void loadArrays() const;
         void addQuad(const QVector3D &a, const QVector3D &b,
                      const QVector3D &c, const QVector3D &d,
                      const QVector<QVector2D> &tex);
         void setColors(int start, GLfloat colors[4][4]);
         const GLushort *indices() const { return faces.constData(); }
         int count() const { return faces.count(); }
     private:
         QVector<GLushort> faces;
         QVector<QVector3D> vertices;
         QVector<QVector3D> normals;
         QVector<QVector2D> texCoords;
         QVector<QVector4D> colors;
         int append(const QVector3D &a, const QVector3D &n, const QVector2D &t);
         void addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n);
         friend class Tile;
     };

     class Tile
     {
     public:
         void draw() const;
         void setColors(GLfloat[4][4]);
     protected:
         Tile(const QVector3D &loc = QVector3D());
         QVector3D location;
         QQuaternion orientation;
     private:
         int start;
         int count;
         bool useFlatColor;
         GLfloat faceColor[4];
         Geometry *geom;
         friend class TileBuilder;
     };

     class TileBuilder
     {
     public:
         enum { bl, br, tr, tl };
         TileBuilder(Geometry *, qreal depth = 0.0f, qreal size = 1.0f);
         Tile *newTile(const QVector3D &loc = QVector3D()) const;
         void setColor(QColor c) { color = c; }
     protected:
         void initialize(Tile *) const;
         QVector<QVector3D> verts;
         QVector<QVector2D> tex;
         int start;
         int count;
         Geometry *geom;
         QColor color;
     };

     class Cube : public QObject, public Tile
     {
         Q_OBJECT
         Q_PROPERTY(qreal range READ range WRITE setRange)
         Q_PROPERTY(qreal altitude READ altitude WRITE setAltitude)
         Q_PROPERTY(qreal rotation READ rotation WRITE setRotation)
     public:
         Cube(const QVector3D &loc = QVector3D());
         ~Cube();
         qreal range() { return location.x(); }
         void setRange(qreal r);
         qreal altitude() { return location.y(); }
         void setAltitude(qreal a);
         qreal rotation() { return rot; }
         void setRotation(qreal r);
         void removeBounce();
         void startAnimation();
         void setAnimationPaused(bool paused);
     signals:
         void changed();
     private:
         qreal rot;
         QPropertyAnimation *r;
         QPropertyAnimation *a;
         QPropertyAnimation *rtn;
         qreal startx;
         friend class CubeBuilder;
     };

     class CubeBuilder : public TileBuilder
     {
     public:
         CubeBuilder(Geometry *, qreal depth = 0.0f, qreal size = 1.0f);
         Cube *newCube(const QVector3D &loc = QVector3D()) const;
     private:
         mutable int ix;
     };

     #endif // CUBE_H