1 | #include <QtGui> |
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2 | #include <QtOpenGL> |
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3 | |
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4 | #include <math.h> |
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5 | |
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6 | #include "glwidget.h" |
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7 | |
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8 | GLWidget::GLWidget(QWidget *parent) |
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9 | : QGLWidget(parent) |
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10 | { |
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11 | object = 0; |
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12 | xRot = 0; |
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13 | yRot = 0; |
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14 | zRot = 0; |
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15 | |
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16 | trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0); |
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17 | trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0); |
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18 | } |
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19 | |
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20 | GLWidget::~GLWidget() |
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21 | { |
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22 | makeCurrent(); |
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23 | glDeleteLists(object, 1); |
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24 | } |
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25 | |
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26 | QSize GLWidget::minimumSizeHint() const |
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27 | { |
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28 | return QSize(50, 50); |
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29 | } |
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30 | |
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31 | QSize GLWidget::sizeHint() const |
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32 | { |
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33 | return QSize(400, 400); |
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34 | } |
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35 | |
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36 | void GLWidget::setXRotation(int angle) |
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37 | { |
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38 | normalizeAngle(&angle); |
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39 | if (angle != xRot) { |
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40 | xRot = angle; |
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41 | emit xRotationChanged(angle); |
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42 | updateGL(); |
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43 | } |
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44 | } |
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45 | |
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46 | void GLWidget::setYRotation(int angle) |
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47 | { |
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48 | normalizeAngle(&angle); |
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49 | if (angle != yRot) { |
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50 | yRot = angle; |
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51 | emit yRotationChanged(angle); |
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52 | updateGL(); |
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53 | } |
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54 | } |
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55 | |
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56 | void GLWidget::setZRotation(int angle) |
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57 | { |
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58 | normalizeAngle(&angle); |
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59 | if (angle != zRot) { |
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60 | zRot = angle; |
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61 | emit zRotationChanged(angle); |
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62 | updateGL(); |
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63 | } |
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64 | } |
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65 | |
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66 | void GLWidget::initializeGL() |
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67 | { |
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68 | qglClearColor(trolltechPurple.dark()); |
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69 | object = makeObject(); |
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70 | glShadeModel(GL_FLAT); |
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71 | glEnable(GL_DEPTH_TEST); |
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72 | glEnable(GL_CULL_FACE); |
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73 | } |
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74 | |
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75 | void GLWidget::paintGL() |
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76 | { |
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77 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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78 | glLoadIdentity(); |
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79 | glTranslated(0.0, 0.0, -10.0); |
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80 | glRotated(xRot / 16.0, 1.0, 0.0, 0.0); |
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81 | glRotated(yRot / 16.0, 0.0, 1.0, 0.0); |
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82 | glRotated(zRot / 16.0, 0.0, 0.0, 1.0); |
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83 | glCallList(object); |
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84 | } |
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85 | |
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86 | void GLWidget::resizeGL(int width, int height) |
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87 | { |
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88 | int side = qMin(width, height); |
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89 | glViewport((width - side) / 2, (height - side) / 2, side, side); |
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90 | |
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91 | glMatrixMode(GL_PROJECTION); |
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92 | glLoadIdentity(); |
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93 | glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0); |
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94 | glMatrixMode(GL_MODELVIEW); |
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95 | } |
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96 | |
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97 | void GLWidget::mousePressEvent(QMouseEvent *event) |
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98 | { |
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99 | lastPos = event->pos(); |
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100 | } |
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101 | |
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102 | void GLWidget::mouseMoveEvent(QMouseEvent *event) |
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103 | { |
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104 | int dx = event->x() - lastPos.x(); |
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105 | int dy = event->y() - lastPos.y(); |
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106 | |
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107 | if (event->buttons() & Qt::LeftButton) { |
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108 | setXRotation(xRot + 8 * dy); |
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109 | setYRotation(yRot + 8 * dx); |
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110 | } else if (event->buttons() & Qt::RightButton) { |
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111 | setXRotation(xRot + 8 * dy); |
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112 | setZRotation(zRot + 8 * dx); |
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113 | } |
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114 | lastPos = event->pos(); |
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115 | } |
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116 | |
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117 | GLuint GLWidget::makeObject() |
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118 | { |
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119 | GLuint list = glGenLists(1); |
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120 | glNewList(list, GL_COMPILE); |
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121 | |
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122 | glBegin(GL_QUADS); |
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123 | |
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124 | GLdouble x1 = +0.06; |
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125 | GLdouble y1 = -0.14; |
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126 | GLdouble x2 = +0.14; |
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127 | GLdouble y2 = -0.06; |
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128 | GLdouble x3 = +0.08; |
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129 | GLdouble y3 = +0.00; |
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130 | GLdouble x4 = +0.30; |
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131 | GLdouble y4 = +0.22; |
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132 | |
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133 | quad(x1, y1, x2, y2, y2, x2, y1, x1); |
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134 | quad(x3, y3, x4, y4, y4, x4, y3, x3); |
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135 | |
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136 | extrude(x1, y1, x2, y2); |
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137 | extrude(x2, y2, y2, x2); |
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138 | extrude(y2, x2, y1, x1); |
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139 | extrude(y1, x1, x1, y1); |
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140 | extrude(x3, y3, x4, y4); |
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141 | extrude(x4, y4, y4, x4); |
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142 | extrude(y4, x4, y3, x3); |
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143 | |
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144 | const double Pi = 3.14159265358979323846; |
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145 | const int NumSectors = 200; |
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146 | |
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147 | for (int i = 0; i < NumSectors; ++i) { |
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148 | double angle1 = (i * 2 * Pi) / NumSectors; |
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149 | GLdouble x5 = 0.30 * sin(angle1); |
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150 | GLdouble y5 = 0.30 * cos(angle1); |
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151 | GLdouble x6 = 0.20 * sin(angle1); |
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152 | GLdouble y6 = 0.20 * cos(angle1); |
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153 | |
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154 | double angle2 = ((i + 1) * 2 * Pi) / NumSectors; |
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155 | GLdouble x7 = 0.20 * sin(angle2); |
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156 | GLdouble y7 = 0.20 * cos(angle2); |
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157 | GLdouble x8 = 0.30 * sin(angle2); |
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158 | GLdouble y8 = 0.30 * cos(angle2); |
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159 | |
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160 | quad(x5, y5, x6, y6, x7, y7, x8, y8); |
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161 | |
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162 | extrude(x6, y6, x7, y7); |
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163 | extrude(x8, y8, x5, y5); |
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164 | } |
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165 | |
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166 | glEnd(); |
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167 | |
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168 | glEndList(); |
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169 | return list; |
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170 | } |
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171 | |
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172 | void GLWidget::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2, |
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173 | GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4) |
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174 | { |
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175 | qglColor(trolltechGreen); |
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176 | |
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177 | glVertex3d(x1, y1, -0.05); |
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178 | glVertex3d(x2, y2, -0.05); |
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179 | glVertex3d(x3, y3, -0.05); |
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180 | glVertex3d(x4, y4, -0.05); |
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181 | |
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182 | glVertex3d(x4, y4, +0.05); |
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183 | glVertex3d(x3, y3, +0.05); |
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184 | glVertex3d(x2, y2, +0.05); |
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185 | glVertex3d(x1, y1, +0.05); |
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186 | } |
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187 | |
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188 | void GLWidget::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2) |
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189 | { |
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190 | qglColor(trolltechGreen.dark(250 + int(100 * x1))); |
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191 | |
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192 | glVertex3d(x1, y1, +0.05); |
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193 | glVertex3d(x2, y2, +0.05); |
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194 | glVertex3d(x2, y2, -0.05); |
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195 | glVertex3d(x1, y1, -0.05); |
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196 | } |
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197 | |
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198 | void GLWidget::normalizeAngle(int *angle) |
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199 | { |
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200 | while (*angle < 0) |
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201 | *angle += 360 * 16; |
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202 | while (*angle > 360 * 16) |
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203 | *angle -= 360 * 16; |
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204 | } |
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