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 "graphwidget.h"
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42 | #include "edge.h"
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43 | #include "node.h"
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44 |
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45 | #include <QtGui>
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46 |
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47 | #include <math.h>
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48 |
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49 | //! [0]
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50 | GraphWidget::GraphWidget(QWidget *parent)
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51 | : QGraphicsView(parent), timerId(0)
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52 | {
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53 | QGraphicsScene *scene = new QGraphicsScene(this);
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54 | scene->setItemIndexMethod(QGraphicsScene::NoIndex);
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55 | scene->setSceneRect(-200, -200, 400, 400);
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56 | setScene(scene);
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57 | setCacheMode(CacheBackground);
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58 | setViewportUpdateMode(BoundingRectViewportUpdate);
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59 | setRenderHint(QPainter::Antialiasing);
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60 | setTransformationAnchor(AnchorUnderMouse);
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61 | scale(qreal(0.8), qreal(0.8));
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62 | setMinimumSize(400, 400);
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63 | setWindowTitle(tr("Elastic Nodes"));
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64 | //! [0]
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65 |
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66 | //! [1]
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67 | Node *node1 = new Node(this);
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68 | Node *node2 = new Node(this);
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69 | Node *node3 = new Node(this);
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70 | Node *node4 = new Node(this);
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71 | centerNode = new Node(this);
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72 | Node *node6 = new Node(this);
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73 | Node *node7 = new Node(this);
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74 | Node *node8 = new Node(this);
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75 | Node *node9 = new Node(this);
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76 | scene->addItem(node1);
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77 | scene->addItem(node2);
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78 | scene->addItem(node3);
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79 | scene->addItem(node4);
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80 | scene->addItem(centerNode);
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81 | scene->addItem(node6);
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82 | scene->addItem(node7);
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83 | scene->addItem(node8);
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84 | scene->addItem(node9);
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85 | scene->addItem(new Edge(node1, node2));
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86 | scene->addItem(new Edge(node2, node3));
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87 | scene->addItem(new Edge(node2, centerNode));
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88 | scene->addItem(new Edge(node3, node6));
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89 | scene->addItem(new Edge(node4, node1));
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90 | scene->addItem(new Edge(node4, centerNode));
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91 | scene->addItem(new Edge(centerNode, node6));
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92 | scene->addItem(new Edge(centerNode, node8));
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93 | scene->addItem(new Edge(node6, node9));
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94 | scene->addItem(new Edge(node7, node4));
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95 | scene->addItem(new Edge(node8, node7));
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96 | scene->addItem(new Edge(node9, node8));
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97 |
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98 | node1->setPos(-50, -50);
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99 | node2->setPos(0, -50);
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100 | node3->setPos(50, -50);
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101 | node4->setPos(-50, 0);
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102 | centerNode->setPos(0, 0);
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103 | node6->setPos(50, 0);
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104 | node7->setPos(-50, 50);
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105 | node8->setPos(0, 50);
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106 | node9->setPos(50, 50);
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107 | }
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108 | //! [1]
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109 |
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110 | //! [2]
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111 | void GraphWidget::itemMoved()
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112 | {
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113 | if (!timerId)
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114 | timerId = startTimer(1000 / 25);
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115 | }
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116 | //! [2]
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117 |
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118 | //! [3]
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119 | void GraphWidget::keyPressEvent(QKeyEvent *event)
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120 | {
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121 | switch (event->key()) {
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122 | case Qt::Key_Up:
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123 | centerNode->moveBy(0, -20);
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124 | break;
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125 | case Qt::Key_Down:
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126 | centerNode->moveBy(0, 20);
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127 | break;
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128 | case Qt::Key_Left:
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129 | centerNode->moveBy(-20, 0);
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130 | break;
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131 | case Qt::Key_Right:
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132 | centerNode->moveBy(20, 0);
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133 | break;
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134 | case Qt::Key_Plus:
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135 | scaleView(qreal(1.2));
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136 | break;
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137 | case Qt::Key_Minus:
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138 | scaleView(1 / qreal(1.2));
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139 | break;
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140 | case Qt::Key_Space:
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141 | case Qt::Key_Enter:
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142 | foreach (QGraphicsItem *item, scene()->items()) {
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143 | if (qgraphicsitem_cast<Node *>(item))
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144 | item->setPos(-150 + qrand() % 300, -150 + qrand() % 300);
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145 | }
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146 | break;
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147 | default:
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148 | QGraphicsView::keyPressEvent(event);
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149 | }
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150 | }
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151 | //! [3]
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152 |
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153 | //! [4]
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154 | void GraphWidget::timerEvent(QTimerEvent *event)
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155 | {
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156 | Q_UNUSED(event);
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157 |
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158 | QList<Node *> nodes;
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159 | foreach (QGraphicsItem *item, scene()->items()) {
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160 | if (Node *node = qgraphicsitem_cast<Node *>(item))
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161 | nodes << node;
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162 | }
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163 |
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164 | foreach (Node *node, nodes)
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165 | node->calculateForces();
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166 |
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167 | bool itemsMoved = false;
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168 | foreach (Node *node, nodes) {
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169 | if (node->advance())
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170 | itemsMoved = true;
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171 | }
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172 |
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173 | if (!itemsMoved) {
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174 | killTimer(timerId);
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175 | timerId = 0;
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176 | }
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177 | }
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178 | //! [4]
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179 |
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180 | //! [5]
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181 | void GraphWidget::wheelEvent(QWheelEvent *event)
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182 | {
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183 | scaleView(pow((double)2, -event->delta() / 240.0));
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184 | }
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185 | //! [5]
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186 |
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187 | //! [6]
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188 | void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
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189 | {
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190 | Q_UNUSED(rect);
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191 |
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192 | // Shadow
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193 | QRectF sceneRect = this->sceneRect();
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194 | QRectF rightShadow(sceneRect.right(), sceneRect.top() + 5, 5, sceneRect.height());
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195 | QRectF bottomShadow(sceneRect.left() + 5, sceneRect.bottom(), sceneRect.width(), 5);
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196 | if (rightShadow.intersects(rect) || rightShadow.contains(rect))
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197 | painter->fillRect(rightShadow, Qt::darkGray);
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198 | if (bottomShadow.intersects(rect) || bottomShadow.contains(rect))
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199 | painter->fillRect(bottomShadow, Qt::darkGray);
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200 |
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201 | // Fill
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202 | QLinearGradient gradient(sceneRect.topLeft(), sceneRect.bottomRight());
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203 | gradient.setColorAt(0, Qt::white);
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204 | gradient.setColorAt(1, Qt::lightGray);
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205 | painter->fillRect(rect.intersect(sceneRect), gradient);
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206 | painter->setBrush(Qt::NoBrush);
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207 | painter->drawRect(sceneRect);
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208 |
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209 | // Text
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210 | QRectF textRect(sceneRect.left() + 4, sceneRect.top() + 4,
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211 | sceneRect.width() - 4, sceneRect.height() - 4);
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212 | QString message(tr("Click and drag the nodes around, and zoom with the mouse "
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213 | "wheel or the '+' and '-' keys"));
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214 |
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215 | QFont font = painter->font();
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216 | font.setBold(true);
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217 | font.setPointSize(14);
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218 | painter->setFont(font);
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219 | painter->setPen(Qt::lightGray);
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220 | painter->drawText(textRect.translated(2, 2), message);
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221 | painter->setPen(Qt::black);
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222 | painter->drawText(textRect, message);
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223 | }
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224 | //! [6]
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225 |
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226 | //! [7]
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227 | void GraphWidget::scaleView(qreal scaleFactor)
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228 | {
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229 | qreal factor = transform().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
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230 | if (factor < 0.07 || factor > 100)
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231 | return;
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232 |
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233 | scale(scaleFactor, scaleFactor);
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234 | }
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235 | //! [7]
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