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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">glwidget.cpp Example File<br /><small><small>opengl/textures/glwidget.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#include <QtGui>

#include <QtOpenGL>

#include <math.h>

#include "glwidget.h"

GLuint GLWidget::sharedObject = 0;

int GLWidget::refCount = 0;

GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)

: QGLWidget(parent, shareWidget)

{

clearColor = Qt::black;

xRot = 0;

yRot = 0;

zRot = 0;

}

GLWidget::~GLWidget()

{

if (--refCount == 0) {

makeCurrent();

glDeleteLists(sharedObject, 1);

}

QSize GLWidget::minimumSizeHint() const

{

return QSize(50, 50);

}

QSize GLWidget::sizeHint() const

{

return QSize(200, 200);

}

void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)

{

xRot += xAngle;

yRot += yAngle;

zRot += zAngle;

updateGL();

}

void GLWidget::setClearColor(const QColor &color)

{

clearColor = color;

updateGL();

}

void GLWidget::initializeGL()

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{

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if (!sharedObject)

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sharedObject = makeObject();

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++refCount;

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glEnable(GL_DEPTH_TEST);

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glEnable(GL_CULL_FACE);

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glEnable(GL_TEXTURE_2D);

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}

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void GLWidget::paintGL()

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{

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qglClearColor(clearColor);

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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

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glLoadIdentity();

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glTranslated(0.0, 0.0, -10.0);

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glRotated(xRot / 16.0, 1.0, 0.0, 0.0);

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glRotated(yRot / 16.0, 0.0, 1.0, 0.0);

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glRotated(zRot / 16.0, 0.0, 0.0, 1.0);

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glCallList(sharedObject);

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}

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void GLWidget::resizeGL(int width, int height)

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{

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int side = qMin(width, height);

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glViewport((width - side) / 2, (height - side) / 2, side, side);

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glMatrixMode(GL_PROJECTION);

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glLoadIdentity();

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glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);

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glMatrixMode(GL_MODELVIEW);

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}

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void GLWidget::mousePressEvent(QMouseEvent *event)

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{

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lastPos = event->pos();

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}

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void GLWidget::mouseMoveEvent(QMouseEvent *event)

139

{

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int dx = event->x() - lastPos.x();

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int dy = event->y() - lastPos.y();

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if (event->buttons() & Qt::LeftButton) {

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rotateBy(8 * dy, 8 * dx, 0);

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} else if (event->buttons() & Qt::RightButton) {

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rotateBy(8 * dy, 0, 8 * dx);

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}

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lastPos = event->pos();

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}

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void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */)

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{

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emit clicked();

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}

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GLuint GLWidget::makeObject()

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{

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static const int coords[6][4][3] = {

159

{ { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },

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{ { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },

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{ { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },

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{ { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },

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{ { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },

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{ { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }

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};

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GLuint list = glGenLists(1);

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glNewList(list, GL_COMPILE);

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for (int i = 0; i < 6; ++i) {

171

bindTexture(QPixmap(QString(":/images/side%1.png").arg(i + 1)));

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glBegin(GL_QUADS);

174

for (int j = 0; j < 4; ++j) {

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glTexCoord2d(j == 0 || j == 3, j == 0 || j == 1);

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glVertex3d(0.2 * coords[i][j][0], 0.2 * coords[i][j][1],

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0.2 * coords[i][j][2]);

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}

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glEnd();

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}

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glEndList();

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return list;

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}</pre>

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