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annotate examples/graphicsview/elasticnodes/graphwidget.d @ 374:681af90e1d53

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Removed debug writelns. Fixed build script.
author Max Samukha <maxter@spambox.com>
date Thu, 08 Jul 2010 22:21:56 +0300
parents 12f60887ed15
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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371
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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 ** $QT_BEGIN_LICENSE:LGPL$
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10 ** Commercial Usage
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11 ** Licensees holding valid Qt Commercial licenses may use this file in
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12 ** accordance with the Qt Commercial License Agreement provided with the
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13 ** Software or, alternatively, in accordance with the terms contained in
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14 ** a written agreement between you and Nokia.
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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 ** GNU General Public License Usage
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29 ** Alternatively, this file may be used under the terms of the GNU
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30 ** General Public License version 3.0 as published by the Free Software
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31 ** Foundation and appearing in the file LICENSE.GPL included in the
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32 ** packaging of this file. Please review the following information to
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33 ** ensure the GNU General Public License version 3.0 requirements will be
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34 ** met: http://www.gnu.org/copyleft/gpl.html.
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35 **
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36 ** If you have questions regarding the use of this file, please contact
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37 ** Nokia at qt-info@nokia.com.
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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 import
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43 std.math;
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44
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45 import
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46 qt.gui.QLinearGradient,
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47 qt.gui.QGraphicsView,
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48 qt.gui.QGraphicsScene;
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49
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50 import
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51 edge,
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52 node;
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53
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54 class GraphWidget : QGraphicsView
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55 {
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56 public:
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57 this()
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58 {
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59 auto scene = new QGraphicsScene(this);
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60 scene.setItemIndexMethod(QGraphicsScene.NoIndex);
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61 scene.setSceneRect(-200, -200, 400, 400);
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62 setScene(scene);
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63 setCacheMode(CacheBackground);
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64 setViewportUpdateMode(BoundingRectViewportUpdate);
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65 setRenderHint(QPainter.Antialiasing);
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66 setTransformationAnchor(AnchorUnderMouse);
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67 setResizeAnchor(AnchorViewCenter);
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68
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69 Node node1 = new Node(this);
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70 Node node2 = new Node(this);
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71 Node node3 = new Node(this);
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72 Node node4 = new Node(this);
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73 centerNode = new Node(this);
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74 Node node6 = new Node(this);
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75 Node node7 = new Node(this);
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76 Node node8 = new Node(this);
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77 Node node9 = new Node(this);
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78 scene.addItem(node1);
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79 scene.addItem(node2);
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80 scene.addItem(node3);
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81 scene.addItem(node4);
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82 scene.addItem(centerNode);
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83 scene.addItem(node6);
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84 scene.addItem(node7);
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85 scene.addItem(node8);
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86 scene.addItem(node9);
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87 scene.addItem(new Edge(node1, node2));
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88 scene.addItem(new Edge(node2, node3));
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89 scene.addItem(new Edge(node2, centerNode));
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90 scene.addItem(new Edge(node3, node6));
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91 scene.addItem(new Edge(node4, node1));
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92 scene.addItem(new Edge(node4, centerNode));
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93 scene.addItem(new Edge(centerNode, node6));
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94 scene.addItem(new Edge(centerNode, node8));
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95 scene.addItem(new Edge(node6, node9));
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96 scene.addItem(new Edge(node7, node4));
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97 scene.addItem(new Edge(node8, node7));
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98 scene.addItem(new Edge(node9, node8));
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99
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100 node1.setPos(-50, -50);
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101 node2.setPos(0, -50);
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102 node3.setPos(50, -50);
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103 node4.setPos(-50, 0);
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104 centerNode.setPos(0, 0);
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105 node6.setPos(50, 0);
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106 node7.setPos(-50, 50);
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107 node8.setPos(0, 50);
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108 node9.setPos(50, 50);
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109
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110 scale(0.8, 0.8);
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111 setMinimumSize(400, 400);
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112 setWindowTitle(tr("Elastic Nodes"));
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113 }
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114
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115 void itemMoved()
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116 {
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117 if (!timerId)
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118 timerId = startTimer(1000 / 25);
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119 }
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120
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121 protected:
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122 void keyPressEvent(QKeyEvent event)
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123 {
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124 switch (event.key()) {
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125 case Qt.Key_Up:
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126 centerNode.moveBy(0, -20);
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127 break;
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128 case Qt.Key_Down:
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129 centerNode.moveBy(0, 20);
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130 break;
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131 case Qt.Key_Left:
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132 centerNode.moveBy(-20, 0);
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133 break;
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134 case Qt.Key_Right:
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135 centerNode.moveBy(20, 0);
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136 break;
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137 case Qt.Key_Plus:
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138 scaleView(1.2);
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139 break;
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140 case Qt.Key_Minus:
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141 scaleView(1 / 1.2);
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142 break;
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143 case Qt.Key_Space:
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144 case Qt.Key_Enter:
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145 foreach (IQGraphicsItem item; scene().items()) {
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146 if (cast(Node)item)
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147 item.setPos(-150 + qrand() % 300, -150 + qrand() % 300);
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148 }
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149 break;
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150 default:
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151 super.keyPressEvent(event);
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152 }
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153 }
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154
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155 void timerEvent(QTimerEvent event)
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156 {
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157 Node[] nodes;
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158 foreach (IQGraphicsItem item; scene().items()) {
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159 if (auto node = cast(Node)item)
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160 nodes ~= node;
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161 }
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162
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163 foreach (Node node; nodes)
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164 node.calculateForces();
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165
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166 bool itemsMoved = false;
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167 foreach (Node node; nodes) {
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168 if (node.advance())
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169 itemsMoved = true;
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170 }
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171
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172 if (!itemsMoved) {
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173 killTimer(timerId);
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174 timerId = 0;
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175 }
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176 }
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177
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178 void wheelEvent(QWheelEvent event)
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179 {
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180 scaleView(pow(cast(float)2, cast(float)(-event.delta() / 240.0)));
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181 }
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182
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183 void drawBackground(QPainter painter, const QRectF rect)
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184 {
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185 // Shadow
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186 QRectF sceneRect = this.sceneRect();
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187 auto rightShadow = QRectF(sceneRect.right(), sceneRect.top() + 5, 5, sceneRect.height());
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188 auto bottomShadow = QRectF(sceneRect.left() + 5, sceneRect.bottom(), sceneRect.width(), 5);
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189 if (rightShadow.intersects(rect) || rightShadow.contains(rect))
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190 painter.fillRect(rightShadow, Qt.darkGray);
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191 if (bottomShadow.intersects(rect) || bottomShadow.contains(rect))
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192 painter.fillRect(bottomShadow, Qt.darkGray);
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193
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194 // Fill
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195 auto gradient = new QLinearGradient(sceneRect.topLeft(), sceneRect.bottomRight());
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196 gradient.setColorAt(0, new QColor(Qt.white));
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197 gradient.setColorAt(1, new QColor(Qt.lightGray));
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198 painter.fillRect(rect.intersected(sceneRect), new QBrush(gradient));
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199 painter.setBrush(Qt.NoBrush);
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200 painter.drawRect(sceneRect);
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201
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202 // Text
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203 auto textRect = QRectF(sceneRect.left() + 4, sceneRect.top() + 4,
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204 sceneRect.width() - 4, sceneRect.height() - 4);
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205 string message = tr("Click and drag the nodes around, and zoom with the mouse "
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206 "wheel or the '+' and '-' keys");
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207
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208 QFont font = painter.font();
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209 font.setBold(true);
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210 font.setPointSize(14);
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211 painter.setFont(font);
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212 painter.setPen(new QColor(Qt.lightGray));
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213 painter.drawText(textRect.translated(2, 2), message);
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214 painter.setPen(new QColor(Qt.black));
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215 painter.drawText(textRect, message);
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216 }
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217
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218 void scaleView(qreal scaleFactor)
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219 {
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220 qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
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221 if (factor < 0.07 || factor > 100)
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222 return;
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223
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224 scale(scaleFactor, scaleFactor);
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225 }
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226
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227 private:
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228 int timerId;
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229 Node centerNode;
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230
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231 mixin Q_OBJECT;
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232 };