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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 #include <stdlib.h> |
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45 |
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46 #include <math.h> |
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47 |
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48 #include "bubble.h" |
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49 #include "qtlogo.h" |
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50 #include "glwidget.h" |
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51 |
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52 #ifndef GL_MULTISAMPLE |
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53 #define GL_MULTISAMPLE 0x809D |
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54 #endif |
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55 |
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56 //! [0] |
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57 GLWidget::GLWidget(QWidget *parent) |
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58 : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) |
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59 { |
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60 QTime midnight(0, 0, 0); |
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61 qsrand(midnight.secsTo(QTime::currentTime())); |
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62 |
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63 logo = 0; |
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64 xRot = 0; |
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65 yRot = 0; |
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66 zRot = 0; |
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67 |
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68 qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0); |
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69 qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0); |
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70 |
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71 animationTimer.setSingleShot(false); |
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72 connect(&animationTimer, SIGNAL(timeout()), this, SLOT(animate())); |
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73 animationTimer.start(25); |
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74 |
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75 setAutoFillBackground(false); |
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76 setMinimumSize(200, 200); |
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77 setWindowTitle(tr("Overpainting a Scene")); |
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78 } |
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79 //! [0] |
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80 |
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81 //! [1] |
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82 GLWidget::~GLWidget() |
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83 { |
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84 } |
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85 //! [1] |
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86 |
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87 static void qNormalizeAngle(int &angle) |
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88 { |
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89 while (angle < 0) |
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90 angle += 360 * 16; |
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91 while (angle > 360 * 16) |
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92 angle -= 360 * 16; |
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93 } |
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94 |
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95 void GLWidget::setXRotation(int angle) |
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96 { |
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97 qNormalizeAngle(angle); |
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98 if (angle != xRot) |
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99 xRot = angle; |
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100 } |
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101 |
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102 void GLWidget::setYRotation(int angle) |
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103 { |
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104 qNormalizeAngle(angle); |
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105 if (angle != yRot) |
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106 yRot = angle; |
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107 } |
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108 |
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109 void GLWidget::setZRotation(int angle) |
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110 { |
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111 qNormalizeAngle(angle); |
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112 if (angle != zRot) |
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113 zRot = angle; |
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114 } |
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115 |
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116 //! [2] |
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117 void GLWidget::initializeGL() |
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118 { |
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119 glEnable(GL_MULTISAMPLE); |
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120 |
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121 logo = new QtLogo(this); |
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122 logo->setColor(qtGreen.dark()); |
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123 } |
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124 //! [2] |
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125 |
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126 void GLWidget::mousePressEvent(QMouseEvent *event) |
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127 { |
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128 lastPos = event->pos(); |
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129 } |
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130 |
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131 void GLWidget::mouseMoveEvent(QMouseEvent *event) |
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132 { |
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133 int dx = event->x() - lastPos.x(); |
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134 int dy = event->y() - lastPos.y(); |
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135 |
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136 if (event->buttons() & Qt::LeftButton) { |
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137 setXRotation(xRot + 8 * dy); |
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138 setYRotation(yRot + 8 * dx); |
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139 } else if (event->buttons() & Qt::RightButton) { |
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140 setXRotation(xRot + 8 * dy); |
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141 setZRotation(zRot + 8 * dx); |
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142 } |
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143 lastPos = event->pos(); |
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144 } |
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145 |
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146 void GLWidget::paintEvent(QPaintEvent *event) |
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147 { |
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148 makeCurrent(); |
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149 //! [4] |
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150 glMatrixMode(GL_MODELVIEW); |
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151 glPushMatrix(); |
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152 //! [4] |
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153 |
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154 //! [6] |
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155 qglClearColor(qtPurple.dark()); |
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156 glShadeModel(GL_SMOOTH); |
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157 glEnable(GL_DEPTH_TEST); |
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158 glEnable(GL_CULL_FACE); |
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159 glEnable(GL_LIGHTING); |
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160 glEnable(GL_LIGHT0); |
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161 glEnable(GL_MULTISAMPLE); |
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162 static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 }; |
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163 glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); |
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164 |
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165 setupViewport(width(), height()); |
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166 //! [6] |
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167 |
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168 //! [7] |
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169 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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170 glLoadIdentity(); |
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171 glTranslatef(0.0, 0.0, -10.0); |
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172 glRotatef(xRot / 16.0, 1.0, 0.0, 0.0); |
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173 glRotatef(yRot / 16.0, 0.0, 1.0, 0.0); |
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174 glRotatef(zRot / 16.0, 0.0, 0.0, 1.0); |
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175 |
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176 logo->draw(); |
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177 //! [7] |
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178 |
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179 //! [8] |
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180 glShadeModel(GL_FLAT); |
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181 glDisable(GL_CULL_FACE); |
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182 glDisable(GL_DEPTH_TEST); |
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183 glDisable(GL_LIGHTING); |
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184 |
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185 glMatrixMode(GL_MODELVIEW); |
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186 glPopMatrix(); |
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187 //! [8] |
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188 |
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189 //! [10] |
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190 QPainter painter(this); |
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191 painter.setRenderHint(QPainter::Antialiasing); |
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192 foreach (Bubble *bubble, bubbles) { |
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193 if (bubble->rect().intersects(event->rect())) |
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194 bubble->drawBubble(&painter); |
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195 } |
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196 drawInstructions(&painter); |
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197 painter.end(); |
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198 } |
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199 //! [10] |
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200 |
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201 //! [11] |
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202 void GLWidget::resizeGL(int width, int height) |
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203 { |
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204 setupViewport(width, height); |
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205 } |
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206 //! [11] |
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207 |
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208 //! [12] |
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209 void GLWidget::showEvent(QShowEvent *event) |
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210 { |
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211 Q_UNUSED(event); |
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212 createBubbles(20 - bubbles.count()); |
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213 } |
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214 //! [12] |
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215 |
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216 QSize GLWidget::sizeHint() const |
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217 { |
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218 return QSize(400, 400); |
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219 } |
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220 |
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221 void GLWidget::createBubbles(int number) |
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222 { |
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223 for (int i = 0; i < number; ++i) { |
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224 QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))), |
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225 height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0)))); |
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226 qreal radius = qMin(width(), height())*(0.0125 + 0.0875*qrand()/(RAND_MAX+1.0)); |
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227 QPointF velocity(width()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)), |
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228 height()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0))); |
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229 |
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230 bubbles.append(new Bubble(position, radius, velocity)); |
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231 } |
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232 } |
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233 |
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234 //! [13] |
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235 void GLWidget::animate() |
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236 { |
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237 QMutableListIterator<Bubble*> iter(bubbles); |
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238 |
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239 while (iter.hasNext()) { |
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240 Bubble *bubble = iter.next(); |
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241 bubble->move(rect()); |
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242 } |
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243 update(); |
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244 } |
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245 //! [13] |
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246 |
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247 //! [14] |
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248 void GLWidget::setupViewport(int width, int height) |
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249 { |
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250 int side = qMin(width, height); |
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251 glViewport((width - side) / 2, (height - side) / 2, side, side); |
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252 |
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253 glMatrixMode(GL_PROJECTION); |
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254 glLoadIdentity(); |
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255 #ifdef QT_OPENGL_ES |
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256 glOrthof(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0); |
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257 #else |
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258 glOrtho(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0); |
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259 #endif |
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260 glMatrixMode(GL_MODELVIEW); |
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261 } |
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262 //! [14] |
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263 |
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264 //! [15] |
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265 void GLWidget::drawInstructions(QPainter *painter) |
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266 { |
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267 QString text = tr("Click and drag with the left mouse button " |
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268 "to rotate the Qt logo."); |
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269 QFontMetrics metrics = QFontMetrics(font()); |
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270 int border = qMax(4, metrics.leading()); |
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271 |
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272 QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125), |
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273 Qt::AlignCenter | Qt::TextWordWrap, text); |
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274 painter->setRenderHint(QPainter::TextAntialiasing); |
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275 painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border), |
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276 QColor(0, 0, 0, 127)); |
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277 painter->setPen(Qt::white); |
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278 painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border), |
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279 QColor(0, 0, 0, 127)); |
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280 painter->drawText((width() - rect.width())/2, border, |
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281 rect.width(), rect.height(), |
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282 Qt::AlignCenter | Qt::TextWordWrap, text); |
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283 } |
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284 //! [15] |