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annotate examples/graphicsview/elasticnodes/node.d @ 371:12f60887ed15

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add elasticnodes example and necessary changes to the library.
author Eldar Insafutdinov
date Wed, 07 Jul 2010 22:54:12 +0100
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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 module node;
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43
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44 import
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45 qt.gui.QRadialGradient,
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46 qt.gui.QGraphicsItem;
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47
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48 import
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49 graphwidget,
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50 edge;
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51
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52 class Node : QGraphicsItem
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53 {
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54 public:
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55 this(GraphWidget graphWidget)
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56 {
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57 graph = graphWidget;
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58 setFlag(ItemIsMovable);
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59 setFlag(ItemSendsGeometryChanges);
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60 setCacheMode(DeviceCoordinateCache);
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61 setZValue(-1);
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62 }
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63
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64 void addEdge(Edge edge)
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65 {
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66 edgeList ~= edge;
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67 edge.adjust();
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68 }
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69 /*
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70 Edge[] edges() const
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71 {
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72 return edgeList;
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73 }
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74 */
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75 enum { Type = UserType + 1 };
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76 int type() const { return Type; }
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77
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78 void calculateForces()
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79 {
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80 if (!scene() || scene().mouseGrabberItem() is this) {
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81 newPos = pos();
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82 return;
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83 }
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84
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85 // Sum up all forces pushing this item away
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86 qreal xvel = 0;
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87 qreal yvel = 0;
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88 foreach (IQGraphicsItem item; scene().items()) {
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89 auto node = cast(Node)item;
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90 if (!node)
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91 continue;
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92
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93 auto line = QLineF(mapFromItem(node, 0, 0), QPointF(0, 0));
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94 qreal dx = line.dx();
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95 qreal dy = line.dy();
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96 double l = 2.0 * (dx * dx + dy * dy);
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97 if (l > 0) {
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98 xvel += (dx * 150.0) / l;
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99 yvel += (dy * 150.0) / l;
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100 }
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101 }
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102
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103 // Now subtract all forces pulling items together
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104 double weight = (edgeList.length + 1) * 10;
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105 foreach (Edge edge; edgeList) {
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106 QPointF pos;
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107 if (edge.sourceNode() == this)
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108 pos = mapFromItem(edge.destNode(), 0, 0);
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109 else
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110 pos = mapFromItem(edge.sourceNode(), 0, 0);
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111 xvel += pos.x() / weight;
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112 yvel += pos.y() / weight;
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113 }
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114
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115 if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
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116 xvel = yvel = 0;
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117
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118 QRectF sceneRect = scene().sceneRect();
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119 newPos = pos() + QPointF(xvel, yvel);
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120 newPos.x = qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10);
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121 newPos.y = qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10);
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122
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123 }
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124
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125 bool advance()
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126 {
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127 auto pos_ = pos();
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128 if (newPos == pos_)
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129 return false;
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130
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131 setPos(newPos);
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132 return true;
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133 }
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134
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135 QRectF boundingRect() const
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136 {
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137 qreal adjust = 2;
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138 return QRectF(-10 - adjust, -10 - adjust,
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139 23 + adjust, 23 + adjust);
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140 }
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141
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142 QPainterPath shape() const
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143 {
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144 QPainterPath path;
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145 path.addEllipse(-10, -10, 20, 20);
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146 return path;
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147 }
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148
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149 override public void paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget = null)
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150 {
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151 painter.setPen(Qt.NoPen);
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152 painter.setBrush(new QBrush(Qt.darkGray));
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153 painter.drawEllipse(-7, -7, 20, 20);
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154
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155 auto gradient = new QRadialGradient(-3, -3, 10);
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156 if (option.state & QStyle.State_Sunken) {
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157 gradient.setCenter(3, 3);
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158 gradient.setFocalPoint(3, 3);
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159 gradient.setColorAt(1, (new QColor(Qt.yellow)).lighter(120));
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160 gradient.setColorAt(0, (new QColor(Qt.darkYellow)).lighter(120));
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161 } else {
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162 gradient.setColorAt(0, new QColor(Qt.yellow));
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163 gradient.setColorAt(1, new QColor(Qt.darkYellow));
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164 }
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165 painter.setBrush(gradient);
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166 painter.setPen(new QPen(new QBrush(Qt.black), 0));
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167 painter.drawEllipse(-10, -10, 20, 20);
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168 }
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169
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170 protected:
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171 override QVariant itemChange(GraphicsItemChange change, QVariant value)
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172 {
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173 switch (change)
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174 {
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175 case ItemPositionHasChanged:
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176 foreach (Edge edge; edgeList)
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177 edge.adjust();
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178 graph.itemMoved();
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179 break;
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180 default:
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181 break;
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182 };
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183
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184 return QGraphicsItem.itemChange(change, value);
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185 }
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186
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187 override void mousePressEvent(QGraphicsSceneMouseEvent event)
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188 {
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189 update();
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190 QGraphicsItem.mousePressEvent(event);
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191 }
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192
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193 override void mouseReleaseEvent(QGraphicsSceneMouseEvent event)
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194 {
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195 update();
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196 QGraphicsItem.mouseReleaseEvent(event);
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197 }
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198
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199 private:
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200 Edge[] edgeList;
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201 QPointF newPos;
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202 GraphWidget graph;
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203 };