1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** Contact: Qt Software Information ([email protected])
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5 | **
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6 | ** This file is part of the examples of the Qt Toolkit.
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7 | **
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8 | ** $QT_BEGIN_LICENSE:LGPL$
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9 | ** Commercial Usage
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10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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11 | ** accordance with the Qt Commercial License Agreement provided with the
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12 | ** Software or, alternatively, in accordance with the terms contained in
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13 | ** a written agreement between you and Nokia.
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14 | **
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15 | ** GNU Lesser General Public License Usage
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16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 | ** General Public License version 2.1 as published by the Free Software
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18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 | ** packaging of this file. Please review the following information to
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20 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 | **
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23 | ** In addition, as a special exception, Nokia gives you certain
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24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 | ** package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you are unsure which license is appropriate for your use, please
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37 | ** contact the sales department at [email protected].
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | #include <QtGui>
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43 | #include <QtOpenGL>
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44 |
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45 | #include <math.h>
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46 |
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47 | #include "glwidget.h"
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48 |
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49 | //! [0]
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50 | GLWidget::GLWidget(QWidget *parent)
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51 | : QGLWidget(parent)
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52 | {
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53 | object = 0;
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54 | xRot = 0;
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55 | yRot = 0;
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56 | zRot = 0;
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57 |
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58 | trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
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59 | trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
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60 | }
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61 | //! [0]
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62 |
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63 | //! [1]
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64 | GLWidget::~GLWidget()
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65 | {
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66 | makeCurrent();
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67 | glDeleteLists(object, 1);
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68 | }
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69 | //! [1]
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70 |
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71 | //! [2]
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72 | QSize GLWidget::minimumSizeHint() const
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73 | {
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74 | return QSize(50, 50);
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75 | }
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76 | //! [2]
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77 |
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78 | //! [3]
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79 | QSize GLWidget::sizeHint() const
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80 | //! [3] //! [4]
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81 | {
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82 | return QSize(400, 400);
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83 | }
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84 | //! [4]
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85 |
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86 | //! [5]
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87 | void GLWidget::setXRotation(int angle)
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88 | {
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89 | normalizeAngle(&angle);
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90 | if (angle != xRot) {
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91 | xRot = angle;
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92 | emit xRotationChanged(angle);
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93 | updateGL();
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94 | }
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95 | }
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96 | //! [5]
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97 |
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98 | void GLWidget::setYRotation(int angle)
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99 | {
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100 | normalizeAngle(&angle);
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101 | if (angle != yRot) {
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102 | yRot = angle;
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103 | emit yRotationChanged(angle);
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104 | updateGL();
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105 | }
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106 | }
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107 |
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108 | void GLWidget::setZRotation(int angle)
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109 | {
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110 | normalizeAngle(&angle);
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111 | if (angle != zRot) {
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112 | zRot = angle;
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113 | emit zRotationChanged(angle);
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114 | updateGL();
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115 | }
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116 | }
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117 |
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118 | //! [6]
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119 | void GLWidget::initializeGL()
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120 | {
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121 | qglClearColor(trolltechPurple.dark());
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122 | object = makeObject();
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123 | glShadeModel(GL_FLAT);
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124 | glEnable(GL_DEPTH_TEST);
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125 | glEnable(GL_CULL_FACE);
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126 | }
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127 | //! [6]
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128 |
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129 | //! [7]
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130 | void GLWidget::paintGL()
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131 | {
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132 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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133 | glLoadIdentity();
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134 | glTranslated(0.0, 0.0, -10.0);
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135 | glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
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136 | glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
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137 | glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
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138 | glCallList(object);
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139 | }
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140 | //! [7]
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141 |
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142 | //! [8]
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143 | void GLWidget::resizeGL(int width, int height)
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144 | {
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145 | int side = qMin(width, height);
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146 | glViewport((width - side) / 2, (height - side) / 2, side, side);
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147 |
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148 | glMatrixMode(GL_PROJECTION);
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149 | glLoadIdentity();
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150 | glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
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151 | glMatrixMode(GL_MODELVIEW);
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152 | }
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153 | //! [8]
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154 |
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155 | //! [9]
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156 | void GLWidget::mousePressEvent(QMouseEvent *event)
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157 | {
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158 | lastPos = event->pos();
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159 | }
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160 | //! [9]
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161 |
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162 | //! [10]
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163 | void GLWidget::mouseMoveEvent(QMouseEvent *event)
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164 | {
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165 | int dx = event->x() - lastPos.x();
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166 | int dy = event->y() - lastPos.y();
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167 |
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168 | if (event->buttons() & Qt::LeftButton) {
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169 | setXRotation(xRot + 8 * dy);
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170 | setYRotation(yRot + 8 * dx);
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171 | } else if (event->buttons() & Qt::RightButton) {
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172 | setXRotation(xRot + 8 * dy);
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173 | setZRotation(zRot + 8 * dx);
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174 | }
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175 | lastPos = event->pos();
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176 | }
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177 | //! [10]
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178 |
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179 | GLuint GLWidget::makeObject()
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180 | {
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181 | GLuint list = glGenLists(1);
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182 | glNewList(list, GL_COMPILE);
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183 |
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184 | glBegin(GL_QUADS);
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185 |
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186 | GLdouble x1 = +0.06;
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187 | GLdouble y1 = -0.14;
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188 | GLdouble x2 = +0.14;
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189 | GLdouble y2 = -0.06;
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190 | GLdouble x3 = +0.08;
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191 | GLdouble y3 = +0.00;
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192 | GLdouble x4 = +0.30;
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193 | GLdouble y4 = +0.22;
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194 |
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195 | quad(x1, y1, x2, y2, y2, x2, y1, x1);
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196 | quad(x3, y3, x4, y4, y4, x4, y3, x3);
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197 |
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198 | extrude(x1, y1, x2, y2);
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199 | extrude(x2, y2, y2, x2);
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200 | extrude(y2, x2, y1, x1);
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201 | extrude(y1, x1, x1, y1);
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202 | extrude(x3, y3, x4, y4);
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203 | extrude(x4, y4, y4, x4);
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204 | extrude(y4, x4, y3, x3);
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205 |
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206 | const double Pi = 3.14159265358979323846;
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207 | const int NumSectors = 200;
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208 |
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209 | for (int i = 0; i < NumSectors; ++i) {
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210 | double angle1 = (i * 2 * Pi) / NumSectors;
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211 | GLdouble x5 = 0.30 * sin(angle1);
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212 | GLdouble y5 = 0.30 * cos(angle1);
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213 | GLdouble x6 = 0.20 * sin(angle1);
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214 | GLdouble y6 = 0.20 * cos(angle1);
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215 |
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216 | double angle2 = ((i + 1) * 2 * Pi) / NumSectors;
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217 | GLdouble x7 = 0.20 * sin(angle2);
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218 | GLdouble y7 = 0.20 * cos(angle2);
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219 | GLdouble x8 = 0.30 * sin(angle2);
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220 | GLdouble y8 = 0.30 * cos(angle2);
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221 |
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222 | quad(x5, y5, x6, y6, x7, y7, x8, y8);
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223 |
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224 | extrude(x6, y6, x7, y7);
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225 | extrude(x8, y8, x5, y5);
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226 | }
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227 |
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228 | glEnd();
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229 |
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230 | glEndList();
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231 | return list;
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232 | }
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233 |
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234 | void GLWidget::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
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235 | GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
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236 | {
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237 | qglColor(trolltechGreen);
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238 |
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239 | glVertex3d(x1, y1, -0.05);
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240 | glVertex3d(x2, y2, -0.05);
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241 | glVertex3d(x3, y3, -0.05);
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242 | glVertex3d(x4, y4, -0.05);
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243 |
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244 | glVertex3d(x4, y4, +0.05);
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245 | glVertex3d(x3, y3, +0.05);
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246 | glVertex3d(x2, y2, +0.05);
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247 | glVertex3d(x1, y1, +0.05);
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248 | }
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249 |
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250 | void GLWidget::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2)
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251 | {
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252 | qglColor(trolltechGreen.dark(250 + int(100 * x1)));
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253 |
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254 | glVertex3d(x1, y1, +0.05);
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255 | glVertex3d(x2, y2, +0.05);
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256 | glVertex3d(x2, y2, -0.05);
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257 | glVertex3d(x1, y1, -0.05);
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258 | }
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259 |
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260 | void GLWidget::normalizeAngle(int *angle)
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261 | {
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262 | while (*angle < 0)
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263 | *angle += 360 * 16;
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264 | while (*angle > 360 * 16)
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265 | *angle -= 360 * 16;
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266 | }
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