cube.h Example File

 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** 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 The Qt Company Ltd 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,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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