1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation ([email protected])
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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 | ** $QT_BEGIN_LICENSE:BSD$
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10 | ** You may use this file under the terms of the BSD license as follows:
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11 | **
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12 | ** "Redistribution and use in source and binary forms, with or without
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13 | ** modification, are permitted provided that the following conditions are
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14 | ** met:
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15 | ** * Redistributions of source code must retain the above copyright
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16 | ** notice, this list of conditions and the following disclaimer.
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17 | ** * Redistributions in binary form must reproduce the above copyright
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18 | ** notice, this list of conditions and the following disclaimer in
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19 | ** the documentation and/or other materials provided with the
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20 | ** distribution.
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21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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22 | ** the names of its contributors may be used to endorse or promote
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23 | ** products derived from this software without specific prior written
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24 | ** permission.
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25 | **
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26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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37 | ** $QT_END_LICENSE$
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38 | **
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39 | ****************************************************************************/
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40 |
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41 | #include <QtGui>
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42 | #include <QtOpenGL>
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43 | #include <stdlib.h>
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44 |
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45 | #include <math.h>
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46 |
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47 | #include "bubble.h"
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48 | #include "qtlogo.h"
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49 | #include "glwidget.h"
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50 |
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51 | #ifndef GL_MULTISAMPLE
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52 | #define GL_MULTISAMPLE 0x809D
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53 | #endif
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54 |
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55 | //! [0]
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56 | GLWidget::GLWidget(QWidget *parent)
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57 | : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
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58 | {
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59 | QTime midnight(0, 0, 0);
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60 | qsrand(midnight.secsTo(QTime::currentTime()));
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61 |
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62 | logo = 0;
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63 | xRot = 0;
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64 | yRot = 0;
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65 | zRot = 0;
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66 |
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67 | qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
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68 | qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
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69 |
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70 | animationTimer.setSingleShot(false);
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71 | connect(&animationTimer, SIGNAL(timeout()), this, SLOT(animate()));
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72 | animationTimer.start(25);
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73 |
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74 | setAutoFillBackground(false);
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75 | setMinimumSize(200, 200);
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76 | setWindowTitle(tr("Overpainting a Scene"));
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77 | }
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78 | //! [0]
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79 |
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80 | //! [1]
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81 | GLWidget::~GLWidget()
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82 | {
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83 | }
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84 | //! [1]
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85 |
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86 | static void qNormalizeAngle(int &angle)
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87 | {
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88 | while (angle < 0)
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89 | angle += 360 * 16;
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90 | while (angle > 360 * 16)
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91 | angle -= 360 * 16;
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92 | }
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93 |
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94 | void GLWidget::setXRotation(int angle)
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95 | {
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96 | qNormalizeAngle(angle);
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97 | if (angle != xRot)
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98 | xRot = angle;
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99 | }
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100 |
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101 | void GLWidget::setYRotation(int angle)
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102 | {
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103 | qNormalizeAngle(angle);
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104 | if (angle != yRot)
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105 | yRot = angle;
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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 | qNormalizeAngle(angle);
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111 | if (angle != zRot)
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112 | zRot = angle;
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113 | }
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114 |
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115 | //! [2]
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116 | void GLWidget::initializeGL()
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117 | {
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118 | glEnable(GL_MULTISAMPLE);
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119 |
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120 | logo = new QtLogo(this);
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121 | logo->setColor(qtGreen.dark());
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122 | }
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123 | //! [2]
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124 |
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125 | void GLWidget::mousePressEvent(QMouseEvent *event)
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126 | {
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127 | lastPos = event->pos();
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128 | }
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129 |
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130 | void GLWidget::mouseMoveEvent(QMouseEvent *event)
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131 | {
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132 | int dx = event->x() - lastPos.x();
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133 | int dy = event->y() - lastPos.y();
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134 |
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135 | if (event->buttons() & Qt::LeftButton) {
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136 | setXRotation(xRot + 8 * dy);
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137 | setYRotation(yRot + 8 * dx);
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138 | } else if (event->buttons() & Qt::RightButton) {
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139 | setXRotation(xRot + 8 * dy);
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140 | setZRotation(zRot + 8 * dx);
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141 | }
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142 | lastPos = event->pos();
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143 | }
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144 |
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145 | void GLWidget::paintEvent(QPaintEvent *event)
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146 | {
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147 | makeCurrent();
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148 | //! [4]
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149 | glMatrixMode(GL_MODELVIEW);
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150 | glPushMatrix();
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151 | //! [4]
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152 |
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153 | //! [6]
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154 | qglClearColor(qtPurple.dark());
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155 | glShadeModel(GL_SMOOTH);
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156 | glEnable(GL_DEPTH_TEST);
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157 | glEnable(GL_CULL_FACE);
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158 | glEnable(GL_LIGHTING);
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159 | glEnable(GL_LIGHT0);
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160 | glEnable(GL_MULTISAMPLE);
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161 | static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
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162 | glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
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163 |
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164 | setupViewport(width(), height());
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165 | //! [6]
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166 |
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167 | //! [7]
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168 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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169 | glLoadIdentity();
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170 | glTranslatef(0.0, 0.0, -10.0);
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171 | glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
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172 | glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
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173 | glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
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174 |
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175 | logo->draw();
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176 | //! [7]
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177 |
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178 | //! [8]
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179 | glShadeModel(GL_FLAT);
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180 | glDisable(GL_CULL_FACE);
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181 | glDisable(GL_DEPTH_TEST);
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182 | glDisable(GL_LIGHTING);
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183 |
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184 | glMatrixMode(GL_MODELVIEW);
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185 | glPopMatrix();
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186 | //! [8]
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187 |
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188 | //! [10]
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189 | QPainter painter(this);
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190 | painter.setRenderHint(QPainter::Antialiasing);
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191 | foreach (Bubble *bubble, bubbles) {
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192 | if (bubble->rect().intersects(event->rect()))
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193 | bubble->drawBubble(&painter);
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194 | }
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195 | drawInstructions(&painter);
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196 | painter.end();
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197 | }
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198 | //! [10]
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199 |
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200 | //! [11]
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201 | void GLWidget::resizeGL(int width, int height)
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202 | {
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203 | setupViewport(width, height);
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204 | }
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205 | //! [11]
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206 |
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207 | //! [12]
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208 | void GLWidget::showEvent(QShowEvent *event)
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209 | {
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210 | Q_UNUSED(event);
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211 | createBubbles(20 - bubbles.count());
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212 | }
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213 | //! [12]
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214 |
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215 | QSize GLWidget::sizeHint() const
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216 | {
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217 | return QSize(400, 400);
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218 | }
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219 |
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220 | void GLWidget::createBubbles(int number)
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221 | {
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222 | for (int i = 0; i < number; ++i) {
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223 | QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
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224 | height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
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225 | qreal radius = qMin(width(), height())*(0.0125 + 0.0875*qrand()/(RAND_MAX+1.0));
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226 | QPointF velocity(width()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)),
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227 | height()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)));
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228 |
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229 | bubbles.append(new Bubble(position, radius, velocity));
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230 | }
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231 | }
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232 |
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233 | //! [13]
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234 | void GLWidget::animate()
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235 | {
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236 | QMutableListIterator<Bubble*> iter(bubbles);
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237 |
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238 | while (iter.hasNext()) {
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239 | Bubble *bubble = iter.next();
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240 | bubble->move(rect());
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241 | }
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242 | update();
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243 | }
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244 | //! [13]
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245 |
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246 | //! [14]
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247 | void GLWidget::setupViewport(int width, int height)
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248 | {
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249 | int side = qMin(width, height);
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250 | glViewport((width - side) / 2, (height - side) / 2, side, side);
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251 |
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252 | glMatrixMode(GL_PROJECTION);
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253 | glLoadIdentity();
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254 | #ifdef QT_OPENGL_ES
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255 | glOrthof(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0);
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256 | #else
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257 | glOrtho(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0);
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258 | #endif
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259 | glMatrixMode(GL_MODELVIEW);
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260 | }
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261 | //! [14]
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262 |
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263 | //! [15]
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264 | void GLWidget::drawInstructions(QPainter *painter)
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265 | {
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266 | QString text = tr("Click and drag with the left mouse button "
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267 | "to rotate the Qt logo.");
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268 | QFontMetrics metrics = QFontMetrics(font());
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269 | int border = qMax(4, metrics.leading());
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270 |
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271 | QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125),
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272 | Qt::AlignCenter | Qt::TextWordWrap, text);
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273 | painter->setRenderHint(QPainter::TextAntialiasing);
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274 | painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
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275 | QColor(0, 0, 0, 127));
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276 | painter->setPen(Qt::white);
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277 | painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
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278 | QColor(0, 0, 0, 127));
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279 | painter->drawText((width() - rect.width())/2, border,
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280 | rect.width(), rect.height(),
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281 | Qt::AlignCenter | Qt::TextWordWrap, text);
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282 | }
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283 | //! [15]
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