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# cube.h Example File

opengl/pbuffers/cube.h

     /****************************************************************************
     **
     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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     ****************************************************************************/

     #ifndef CUBE_H
     #define CUBE_H

     #include <QtOpenGL/qgl.h>
     #include <QtCore/qvector.h>
     #include <QtCore/qsequentialanimationgroup.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 *rtn;
         QSequentialAnimationGroup *animGroup;
         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