diff options
Diffstat (limited to 'examples/opengl/grabber/glwidget.cpp')
-rw-r--r-- | examples/opengl/grabber/glwidget.cpp | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/examples/opengl/grabber/glwidget.cpp b/examples/opengl/grabber/glwidget.cpp new file mode 100644 index 0000000..71550ac --- /dev/null +++ b/examples/opengl/grabber/glwidget.cpp @@ -0,0 +1,284 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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; +} |