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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 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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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 GLWidget::GLWidget(QWidget *parent) |
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50 : QGLWidget(parent) |
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51 { |
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52 gear1 = 0; |
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53 gear2 = 0; |
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54 gear3 = 0; |
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55 xRot = 0; |
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56 yRot = 0; |
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57 zRot = 0; |
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58 gear1Rot = 0; |
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59 |
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60 QTimer *timer = new QTimer(this); |
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61 connect(timer, SIGNAL(timeout()), this, SLOT(advanceGears())); |
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62 timer->start(20); |
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63 } |
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64 |
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65 GLWidget::~GLWidget() |
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66 { |
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67 makeCurrent(); |
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68 glDeleteLists(gear1, 1); |
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69 glDeleteLists(gear2, 1); |
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70 glDeleteLists(gear3, 1); |
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71 } |
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72 |
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73 void GLWidget::setXRotation(int angle) |
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74 { |
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75 normalizeAngle(&angle); |
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76 if (angle != xRot) { |
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77 xRot = angle; |
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78 emit xRotationChanged(angle); |
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79 updateGL(); |
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80 } |
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81 } |
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82 |
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83 void GLWidget::setYRotation(int angle) |
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84 { |
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85 normalizeAngle(&angle); |
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86 if (angle != yRot) { |
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87 yRot = angle; |
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88 emit yRotationChanged(angle); |
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89 updateGL(); |
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90 } |
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91 } |
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92 |
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93 void GLWidget::setZRotation(int angle) |
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94 { |
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95 normalizeAngle(&angle); |
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96 if (angle != zRot) { |
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97 zRot = angle; |
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98 emit zRotationChanged(angle); |
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99 updateGL(); |
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100 } |
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101 } |
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102 |
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103 void GLWidget::initializeGL() |
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104 { |
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105 static const GLfloat lightPos[4] = { 5.0f, 5.0f, 10.0f, 1.0f }; |
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106 static const GLfloat reflectance1[4] = { 0.8f, 0.1f, 0.0f, 1.0f }; |
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107 static const GLfloat reflectance2[4] = { 0.0f, 0.8f, 0.2f, 1.0f }; |
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108 static const GLfloat reflectance3[4] = { 0.2f, 0.2f, 1.0f, 1.0f }; |
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109 |
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110 glLightfv(GL_LIGHT0, GL_POSITION, lightPos); |
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111 glEnable(GL_LIGHTING); |
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112 glEnable(GL_LIGHT0); |
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113 glEnable(GL_DEPTH_TEST); |
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114 |
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115 gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20); |
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116 gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10); |
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117 gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10); |
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118 |
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119 glEnable(GL_NORMALIZE); |
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120 glClearColor(0.0f, 0.0f, 0.0f, 1.0f); |
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121 } |
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122 |
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123 void GLWidget::paintGL() |
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124 { |
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125 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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126 |
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127 glPushMatrix(); |
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128 glRotated(xRot / 16.0, 1.0, 0.0, 0.0); |
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129 glRotated(yRot / 16.0, 0.0, 1.0, 0.0); |
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130 glRotated(zRot / 16.0, 0.0, 0.0, 1.0); |
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131 |
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132 drawGear(gear1, -3.0, -2.0, 0.0, gear1Rot / 16.0); |
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133 drawGear(gear2, +3.1, -2.0, 0.0, -2.0 * (gear1Rot / 16.0) - 9.0); |
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134 |
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135 glRotated(+90.0, 1.0, 0.0, 0.0); |
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136 drawGear(gear3, -3.1, -1.8, -2.2, +2.0 * (gear1Rot / 16.0) - 2.0); |
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137 |
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138 glPopMatrix(); |
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139 } |
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140 |
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141 void GLWidget::resizeGL(int width, int height) |
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142 { |
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143 int side = qMin(width, height); |
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144 glViewport((width - side) / 2, (height - side) / 2, side, side); |
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145 |
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146 glMatrixMode(GL_PROJECTION); |
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147 glLoadIdentity(); |
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148 glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0); |
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149 glMatrixMode(GL_MODELVIEW); |
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150 glLoadIdentity(); |
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151 glTranslated(0.0, 0.0, -40.0); |
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152 } |
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153 |
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154 void GLWidget::mousePressEvent(QMouseEvent *event) |
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155 { |
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156 lastPos = event->pos(); |
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157 } |
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158 |
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159 void GLWidget::mouseMoveEvent(QMouseEvent *event) |
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160 { |
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161 int dx = event->x() - lastPos.x(); |
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162 int dy = event->y() - lastPos.y(); |
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163 |
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164 if (event->buttons() & Qt::LeftButton) { |
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165 setXRotation(xRot + 8 * dy); |
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166 setYRotation(yRot + 8 * dx); |
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167 } else if (event->buttons() & Qt::RightButton) { |
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168 setXRotation(xRot + 8 * dy); |
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169 setZRotation(zRot + 8 * dx); |
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170 } |
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171 lastPos = event->pos(); |
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172 } |
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173 |
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174 void GLWidget::advanceGears() |
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175 { |
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176 gear1Rot += 2 * 16; |
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177 updateGL(); |
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178 } |
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179 |
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180 GLuint GLWidget::makeGear(const GLfloat *reflectance, GLdouble innerRadius, |
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181 GLdouble outerRadius, GLdouble thickness, |
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182 GLdouble toothSize, GLint toothCount) |
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183 { |
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184 const double Pi = 3.14159265358979323846; |
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185 |
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186 GLuint list = glGenLists(1); |
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187 glNewList(list, GL_COMPILE); |
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188 glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance); |
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189 |
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190 GLdouble r0 = innerRadius; |
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191 GLdouble r1 = outerRadius - toothSize / 2.0; |
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192 GLdouble r2 = outerRadius + toothSize / 2.0; |
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193 GLdouble delta = (2.0 * Pi / toothCount) / 4.0; |
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194 GLdouble z = thickness / 2.0; |
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195 int i, j; |
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196 |
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197 glShadeModel(GL_FLAT); |
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198 |
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199 for (i = 0; i < 2; ++i) { |
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200 GLdouble sign = (i == 0) ? +1.0 : -1.0; |
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201 |
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202 glNormal3d(0.0, 0.0, sign); |
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203 |
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204 glBegin(GL_QUAD_STRIP); |
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205 for (j = 0; j <= toothCount; ++j) { |
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206 GLdouble angle = 2.0 * Pi * j / toothCount; |
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207 glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z); |
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208 glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z); |
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209 glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z); |
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210 glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), |
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211 sign * z); |
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212 } |
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213 glEnd(); |
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214 |
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215 glBegin(GL_QUADS); |
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216 for (j = 0; j < toothCount; ++j) { |
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217 GLdouble angle = 2.0 * Pi * j / toothCount; |
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218 glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z); |
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219 glVertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta), |
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220 sign * z); |
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221 glVertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta), |
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222 sign * z); |
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223 glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), |
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224 sign * z); |
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225 } |
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226 glEnd(); |
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227 } |
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228 |
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229 glBegin(GL_QUAD_STRIP); |
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230 for (i = 0; i < toothCount; ++i) { |
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231 for (j = 0; j < 2; ++j) { |
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232 GLdouble angle = 2.0 * Pi * (i + (j / 2.0)) / toothCount; |
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233 GLdouble s1 = r1; |
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234 GLdouble s2 = r2; |
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235 if (j == 1) |
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236 qSwap(s1, s2); |
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237 |
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238 glNormal3d(cos(angle), sin(angle), 0.0); |
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239 glVertex3d(s1 * cos(angle), s1 * sin(angle), +z); |
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240 glVertex3d(s1 * cos(angle), s1 * sin(angle), -z); |
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241 |
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242 glNormal3d(s2 * sin(angle + delta) - s1 * sin(angle), |
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243 s1 * cos(angle) - s2 * cos(angle + delta), 0.0); |
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244 glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z); |
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245 glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z); |
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246 } |
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247 } |
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248 glVertex3d(r1, 0.0, +z); |
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249 glVertex3d(r1, 0.0, -z); |
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250 glEnd(); |
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251 |
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252 glShadeModel(GL_SMOOTH); |
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253 |
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254 glBegin(GL_QUAD_STRIP); |
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255 for (i = 0; i <= toothCount; ++i) { |
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256 GLdouble angle = i * 2.0 * Pi / toothCount; |
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257 glNormal3d(-cos(angle), -sin(angle), 0.0); |
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258 glVertex3d(r0 * cos(angle), r0 * sin(angle), +z); |
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259 glVertex3d(r0 * cos(angle), r0 * sin(angle), -z); |
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260 } |
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261 glEnd(); |
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262 |
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263 glEndList(); |
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264 |
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265 return list; |
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266 } |
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267 |
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268 void GLWidget::drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz, |
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269 GLdouble angle) |
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270 { |
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271 glPushMatrix(); |
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272 glTranslated(dx, dy, dz); |
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273 glRotated(angle, 0.0, 0.0, 1.0); |
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274 glCallList(gear); |
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275 glPopMatrix(); |
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276 } |
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277 |
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278 void GLWidget::normalizeAngle(int *angle) |
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279 { |
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280 while (*angle < 0) |
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281 *angle += 360 * 16; |
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282 while (*angle > 360 * 16) |
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283 *angle -= 360 * 16; |
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284 } |