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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 "mouse.h" |
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43 |
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44 #include <QGraphicsScene> |
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45 #include <QPainter> |
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46 #include <QStyleOption> |
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47 |
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48 #include <math.h> |
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49 |
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50 static const double Pi = 3.14159265358979323846264338327950288419717; |
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51 static double TwoPi = 2.0 * Pi; |
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52 |
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53 static qreal normalizeAngle(qreal angle) |
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54 { |
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55 while (angle < 0) |
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56 angle += TwoPi; |
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57 while (angle > TwoPi) |
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58 angle -= TwoPi; |
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59 return angle; |
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60 } |
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61 |
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62 //! [0] |
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63 Mouse::Mouse() |
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64 : angle(0), speed(0), mouseEyeDirection(0), |
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65 color(qrand() % 256, qrand() % 256, qrand() % 256) |
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66 { |
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67 rotate(qrand() % (360 * 16)); |
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68 startTimer(1000 / 33); |
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69 } |
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70 //! [0] |
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71 |
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72 //! [1] |
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73 QRectF Mouse::boundingRect() const |
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74 { |
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75 qreal adjust = 0.5; |
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76 return QRectF(-18 - adjust, -22 - adjust, |
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77 36 + adjust, 60 + adjust); |
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78 } |
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79 //! [1] |
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80 |
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81 //! [2] |
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82 QPainterPath Mouse::shape() const |
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83 { |
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84 QPainterPath path; |
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85 path.addRect(-10, -20, 20, 40); |
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86 return path; |
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87 } |
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88 //! [2] |
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89 |
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90 //! [3] |
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91 void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) |
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92 { |
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93 // Body |
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94 painter->setBrush(color); |
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95 painter->drawEllipse(-10, -20, 20, 40); |
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96 |
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97 // Eyes |
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98 painter->setBrush(Qt::white); |
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99 painter->drawEllipse(-10, -17, 8, 8); |
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100 painter->drawEllipse(2, -17, 8, 8); |
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101 |
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102 // Nose |
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103 painter->setBrush(Qt::black); |
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104 painter->drawEllipse(QRectF(-2, -22, 4, 4)); |
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105 |
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106 // Pupils |
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107 painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4)); |
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108 painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4)); |
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109 |
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110 // Ears |
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111 painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red); |
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112 painter->drawEllipse(-17, -12, 16, 16); |
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113 painter->drawEllipse(1, -12, 16, 16); |
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114 |
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115 // Tail |
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116 QPainterPath path(QPointF(0, 20)); |
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117 path.cubicTo(-5, 22, -5, 22, 0, 25); |
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118 path.cubicTo(5, 27, 5, 32, 0, 30); |
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119 path.cubicTo(-5, 32, -5, 42, 0, 35); |
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120 painter->setBrush(Qt::NoBrush); |
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121 painter->drawPath(path); |
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122 } |
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123 //! [3] |
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124 |
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125 //! [4] |
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126 void Mouse::timerEvent(QTimerEvent *) |
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127 { |
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128 //! [4] |
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129 // Don't move too far away |
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130 //! [5] |
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131 QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0)); |
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132 if (lineToCenter.length() > 150) { |
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133 qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length()); |
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134 if (lineToCenter.dy() < 0) |
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135 angleToCenter = TwoPi - angleToCenter; |
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136 angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2); |
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137 |
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138 if (angleToCenter < Pi && angleToCenter > Pi / 4) { |
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139 // Rotate left |
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140 angle += (angle < -Pi / 2) ? 0.25 : -0.25; |
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141 } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) { |
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142 // Rotate right |
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143 angle += (angle < Pi / 2) ? 0.25 : -0.25; |
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144 } |
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145 } else if (::sin(angle) < 0) { |
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146 angle += 0.25; |
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147 } else if (::sin(angle) > 0) { |
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148 angle -= 0.25; |
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149 //! [5] //! [6] |
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150 } |
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151 //! [6] |
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152 |
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153 // Try not to crash with any other mice |
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154 //! [7] |
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155 QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF() |
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156 << mapToScene(0, 0) |
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157 << mapToScene(-30, -50) |
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158 << mapToScene(30, -50)); |
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159 foreach (QGraphicsItem *item, dangerMice) { |
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160 if (item == this) |
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161 continue; |
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162 |
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163 QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0)); |
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164 qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length()); |
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165 if (lineToMouse.dy() < 0) |
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166 angleToMouse = TwoPi - angleToMouse; |
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167 angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2); |
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168 |
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169 if (angleToMouse >= 0 && angleToMouse < Pi / 2) { |
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170 // Rotate right |
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171 angle += 0.5; |
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172 } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) { |
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173 // Rotate left |
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174 angle -= 0.5; |
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175 //! [7] //! [8] |
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176 } |
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177 //! [8] //! [9] |
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178 } |
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179 //! [9] |
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180 |
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181 // Add some random movement |
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182 //! [10] |
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183 if (dangerMice.size() > 1 && (qrand() % 10) == 0) { |
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184 if (qrand() % 1) |
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185 angle += (qrand() % 100) / 500.0; |
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186 else |
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187 angle -= (qrand() % 100) / 500.0; |
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188 } |
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189 //! [10] |
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190 |
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191 //! [11] |
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192 speed += (-50 + qrand() % 100) / 100.0; |
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193 |
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194 qreal dx = ::sin(angle) * 10; |
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195 mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5; |
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196 |
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197 rotate(dx); |
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198 setPos(mapToParent(0, -(3 + sin(speed) * 3))); |
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199 } |
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200 //! [11] |