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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** 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 Nokia Corporation 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,
+** 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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+#include <QtOpenGL>
+
+#include <math.h>
+
+#include "glwidget.h"
+
+GLWidget::GLWidget(QWidget *parent)
+ : QGLWidget(parent)
+{
+ gear1 = 0;
+ gear2 = 0;
+ gear3 = 0;
+ xRot = 0;
+ yRot = 0;
+ zRot = 0;
+ gear1Rot = 0;
+
+ QTimer *timer = new QTimer(this);
+ connect(timer, SIGNAL(timeout()), this, SLOT(advanceGears()));
+ timer->start(20);
+}
+
+GLWidget::~GLWidget()
+{
+ makeCurrent();
+ glDeleteLists(gear1, 1);
+ glDeleteLists(gear2, 1);
+ glDeleteLists(gear3, 1);
+}
+
+void GLWidget::setXRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != xRot) {
+ xRot = angle;
+ emit xRotationChanged(angle);
+ updateGL();
+ }
+}
+
+void GLWidget::setYRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != yRot) {
+ yRot = angle;
+ emit yRotationChanged(angle);
+ updateGL();
+ }
+}
+
+void GLWidget::setZRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != zRot) {
+ zRot = angle;
+ emit zRotationChanged(angle);
+ updateGL();
+ }
+}
+
+void GLWidget::initializeGL()
+{
+ static const GLfloat lightPos[4] = { 5.0f, 5.0f, 10.0f, 1.0f };
+ static const GLfloat reflectance1[4] = { 0.8f, 0.1f, 0.0f, 1.0f };
+ static const GLfloat reflectance2[4] = { 0.0f, 0.8f, 0.2f, 1.0f };
+ static const GLfloat reflectance3[4] = { 0.2f, 0.2f, 1.0f, 1.0f };
+
+ glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+ glEnable(GL_DEPTH_TEST);
+
+ gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20);
+ gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10);
+ gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10);
+
+ glEnable(GL_NORMALIZE);
+ glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+}
+
+void GLWidget::paintGL()
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ glPushMatrix();
+ glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
+ glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
+ glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
+
+ drawGear(gear1, -3.0, -2.0, 0.0, gear1Rot / 16.0);
+ drawGear(gear2, +3.1, -2.0, 0.0, -2.0 * (gear1Rot / 16.0) - 9.0);
+
+ glRotated(+90.0, 1.0, 0.0, 0.0);
+ drawGear(gear3, -3.1, -1.8, -2.2, +2.0 * (gear1Rot / 16.0) - 2.0);
+
+ glPopMatrix();
+}
+
+void GLWidget::resizeGL(int width, int height)
+{
+ int side = qMin(width, height);
+ glViewport((width - side) / 2, (height - side) / 2, side, side);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslated(0.0, 0.0, -40.0);
+}
+
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+ lastPos = event->pos();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+ int dx = event->x() - lastPos.x();
+ int dy = event->y() - lastPos.y();
+
+ if (event->buttons() & Qt::LeftButton) {
+ setXRotation(xRot + 8 * dy);
+ setYRotation(yRot + 8 * dx);
+ } else if (event->buttons() & Qt::RightButton) {
+ setXRotation(xRot + 8 * dy);
+ setZRotation(zRot + 8 * dx);
+ }
+ lastPos = event->pos();
+}
+
+void GLWidget::advanceGears()
+{
+ gear1Rot += 2 * 16;
+ updateGL();
+}
+
+GLuint GLWidget::makeGear(const GLfloat *reflectance, GLdouble innerRadius,
+ GLdouble outerRadius, GLdouble thickness,
+ GLdouble toothSize, GLint toothCount)
+{
+ const double Pi = 3.14159265358979323846;
+
+ GLuint list = glGenLists(1);
+ glNewList(list, GL_COMPILE);
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance);
+
+ GLdouble r0 = innerRadius;
+ GLdouble r1 = outerRadius - toothSize / 2.0;
+ GLdouble r2 = outerRadius + toothSize / 2.0;
+ GLdouble delta = (2.0 * Pi / toothCount) / 4.0;
+ GLdouble z = thickness / 2.0;
+ int i, j;
+
+ glShadeModel(GL_FLAT);
+
+ for (i = 0; i < 2; ++i) {
+ GLdouble sign = (i == 0) ? +1.0 : -1.0;
+
+ glNormal3d(0.0, 0.0, sign);
+
+ glBegin(GL_QUAD_STRIP);
+ for (j = 0; j <= toothCount; ++j) {
+ GLdouble angle = 2.0 * Pi * j / toothCount;
+ glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
+ glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
+ glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
+ glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta),
+ sign * z);
+ }
+ glEnd();
+
+ glBegin(GL_QUADS);
+ for (j = 0; j < toothCount; ++j) {
+ GLdouble angle = 2.0 * Pi * j / toothCount;
+ glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
+ glVertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta),
+ sign * z);
+ glVertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta),
+ sign * z);
+ glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta),
+ sign * z);
+ }
+ glEnd();
+ }
+
+ glBegin(GL_QUAD_STRIP);
+ for (i = 0; i < toothCount; ++i) {
+ for (j = 0; j < 2; ++j) {
+ GLdouble angle = 2.0 * Pi * (i + (j / 2.0)) / toothCount;
+ GLdouble s1 = r1;
+ GLdouble s2 = r2;
+ if (j == 1)
+ qSwap(s1, s2);
+
+ glNormal3d(cos(angle), sin(angle), 0.0);
+ glVertex3d(s1 * cos(angle), s1 * sin(angle), +z);
+ glVertex3d(s1 * cos(angle), s1 * sin(angle), -z);
+
+ glNormal3d(s2 * sin(angle + delta) - s1 * sin(angle),
+ s1 * cos(angle) - s2 * cos(angle + delta), 0.0);
+ glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z);
+ glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z);
+ }
+ }
+ glVertex3d(r1, 0.0, +z);
+ glVertex3d(r1, 0.0, -z);
+ glEnd();
+
+ glShadeModel(GL_SMOOTH);
+
+ glBegin(GL_QUAD_STRIP);
+ for (i = 0; i <= toothCount; ++i) {
+ GLdouble angle = i * 2.0 * Pi / toothCount;
+ glNormal3d(-cos(angle), -sin(angle), 0.0);
+ glVertex3d(r0 * cos(angle), r0 * sin(angle), +z);
+ glVertex3d(r0 * cos(angle), r0 * sin(angle), -z);
+ }
+ glEnd();
+
+ glEndList();
+
+ return list;
+}
+
+void GLWidget::drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
+ GLdouble angle)
+{
+ glPushMatrix();
+ glTranslated(dx, dy, dz);
+ glRotated(angle, 0.0, 0.0, 1.0);
+ glCallList(gear);
+ glPopMatrix();
+}
+
+void GLWidget::normalizeAngle(int *angle)
+{
+ while (*angle < 0)
+ *angle += 360 * 16;
+ while (*angle > 360 * 16)
+ *angle -= 360 * 16;
+}
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