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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 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 ** $QT_BEGIN_LICENSE:BSD$ |
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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 "mouse.h" |
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42 |
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43 #include <QGraphicsScene> |
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44 #include <QPainter> |
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45 #include <QStyleOption> |
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46 |
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47 #include <math.h> |
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48 |
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49 static const double Pi = 3.14159265358979323846264338327950288419717; |
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50 static double TwoPi = 2.0 * Pi; |
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51 |
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52 static qreal normalizeAngle(qreal angle) |
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53 { |
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54 while (angle < 0) |
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55 angle += TwoPi; |
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56 while (angle > TwoPi) |
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57 angle -= TwoPi; |
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58 return angle; |
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59 } |
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60 |
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61 //! [0] |
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62 Mouse::Mouse() |
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63 : angle(0), speed(0), mouseEyeDirection(0), |
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64 color(qrand() % 256, qrand() % 256, qrand() % 256) |
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65 { |
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66 rotate(qrand() % (360 * 16)); |
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67 startTimer(1000 / 33); |
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68 } |
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69 //! [0] |
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70 |
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71 //! [1] |
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72 QRectF Mouse::boundingRect() const |
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73 { |
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74 qreal adjust = 0.5; |
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75 return QRectF(-18 - adjust, -22 - adjust, |
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76 36 + adjust, 60 + adjust); |
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77 } |
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78 //! [1] |
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79 |
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80 //! [2] |
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81 QPainterPath Mouse::shape() const |
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82 { |
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83 QPainterPath path; |
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84 path.addRect(-10, -20, 20, 40); |
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85 return path; |
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86 } |
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87 //! [2] |
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88 |
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89 //! [3] |
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90 void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) |
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91 { |
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92 // Body |
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93 painter->setBrush(color); |
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94 painter->drawEllipse(-10, -20, 20, 40); |
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95 |
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96 // Eyes |
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97 painter->setBrush(Qt::white); |
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98 painter->drawEllipse(-10, -17, 8, 8); |
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99 painter->drawEllipse(2, -17, 8, 8); |
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100 |
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101 // Nose |
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102 painter->setBrush(Qt::black); |
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103 painter->drawEllipse(QRectF(-2, -22, 4, 4)); |
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104 |
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105 // Pupils |
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106 painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4)); |
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107 painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4)); |
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108 |
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109 // Ears |
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110 painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red); |
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111 painter->drawEllipse(-17, -12, 16, 16); |
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112 painter->drawEllipse(1, -12, 16, 16); |
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113 |
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114 // Tail |
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115 QPainterPath path(QPointF(0, 20)); |
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116 path.cubicTo(-5, 22, -5, 22, 0, 25); |
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117 path.cubicTo(5, 27, 5, 32, 0, 30); |
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118 path.cubicTo(-5, 32, -5, 42, 0, 35); |
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119 painter->setBrush(Qt::NoBrush); |
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120 painter->drawPath(path); |
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121 } |
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122 //! [3] |
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123 |
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124 //! [4] |
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125 void Mouse::timerEvent(QTimerEvent *) |
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126 { |
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127 //! [4] |
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128 // Don't move too far away |
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129 //! [5] |
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130 QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0)); |
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131 if (lineToCenter.length() > 150) { |
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132 qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length()); |
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133 if (lineToCenter.dy() < 0) |
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134 angleToCenter = TwoPi - angleToCenter; |
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135 angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2); |
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136 |
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137 if (angleToCenter < Pi && angleToCenter > Pi / 4) { |
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138 // Rotate left |
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139 angle += (angle < -Pi / 2) ? 0.25 : -0.25; |
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140 } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) { |
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141 // Rotate right |
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142 angle += (angle < Pi / 2) ? 0.25 : -0.25; |
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143 } |
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144 } else if (::sin(angle) < 0) { |
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145 angle += 0.25; |
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146 } else if (::sin(angle) > 0) { |
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147 angle -= 0.25; |
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148 //! [5] //! [6] |
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149 } |
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150 //! [6] |
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151 |
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152 // Try not to crash with any other mice |
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153 //! [7] |
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154 QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF() |
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155 << mapToScene(0, 0) |
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156 << mapToScene(-30, -50) |
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157 << mapToScene(30, -50)); |
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158 foreach (QGraphicsItem *item, dangerMice) { |
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159 if (item == this) |
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160 continue; |
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161 |
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162 QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0)); |
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163 qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length()); |
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164 if (lineToMouse.dy() < 0) |
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165 angleToMouse = TwoPi - angleToMouse; |
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166 angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2); |
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167 |
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168 if (angleToMouse >= 0 && angleToMouse < Pi / 2) { |
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169 // Rotate right |
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170 angle += 0.5; |
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171 } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) { |
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172 // Rotate left |
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173 angle -= 0.5; |
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174 //! [7] //! [8] |
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175 } |
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176 //! [8] //! [9] |
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177 } |
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178 //! [9] |
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179 |
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180 // Add some random movement |
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181 //! [10] |
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182 if (dangerMice.size() > 1 && (qrand() % 10) == 0) { |
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183 if (qrand() % 1) |
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184 angle += (qrand() % 100) / 500.0; |
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185 else |
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186 angle -= (qrand() % 100) / 500.0; |
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187 } |
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188 //! [10] |
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189 |
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190 //! [11] |
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191 speed += (-50 + qrand() % 100) / 100.0; |
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192 |
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193 qreal dx = ::sin(angle) * 10; |
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194 mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5; |
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195 |
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196 rotate(dx); |
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197 setPos(mapToParent(0, -(3 + sin(speed) * 3))); |
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198 } |
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199 //! [11] |