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Declare tabArray const.
author David Nadlinger <code@klickverbot.at>
date Fri, 06 May 2011 13:39:49 +0200
parents 12f60887ed15
children
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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 module edge;
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42
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43 import std.math;
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44 import qt.gui.QGraphicsItem;
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45
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46 import node;
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47
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48 static const double Pi = 3.14159265358979323846264338327950288419717;
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49 static double TwoPi = 2.0 * Pi;
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50
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51 class Edge : QGraphicsItem
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52 {
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53 public:
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54 this(Node sourceNode, Node destNode)
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55 {
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56 arrowSize = 10;
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57 setAcceptedMouseButtons(0);
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58 source = sourceNode;
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59 dest = destNode;
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60 source.addEdge(this);
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61 dest.addEdge(this);
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62 adjust();
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63 }
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64
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65 Node sourceNode() const
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66 {
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67 return cast(Node)source;
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68 }
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69
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70 void setSourceNode(Node node)
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71 {
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72 source = node;
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73 adjust();
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74 }
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75
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76 Node destNode() const
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77 {
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78 return cast(Node)dest;
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79 }
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80
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81 void setDestNode(Node node)
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82 {
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83 dest = node;
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84 adjust();
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85 }
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86
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87 void adjust()
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88 {
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89 if (!source || !dest)
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90 return;
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91
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92 auto line = QLineF(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0));
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93 qreal length = line.length();
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94
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95 prepareGeometryChange();
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96
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97 if (length > 20.) {
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98 auto edgeOffset = QPointF((line.dx() * 10) / length, (line.dy() * 10) / length);
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99 sourcePoint = line.p1() + edgeOffset;
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100 destPoint = line.p2() - edgeOffset;
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101 } else {
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102 sourcePoint = destPoint = line.p1();
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103 }
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104 }
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105
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106 enum { Type = UserType + 2 };
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107 int type() const { return Type; }
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108
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109 protected:
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110 override QRectF boundingRect() const
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111 {
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112 if (!source || !dest)
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113 return QRectF();
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114
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115 qreal penWidth = 1;
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116 qreal extra = (penWidth + arrowSize) / 2.0;
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117
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118 return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(),
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119 destPoint.y() - sourcePoint.y()))
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120 .normalized()
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121 .adjusted(-extra, -extra, extra, extra);
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122 }
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123
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124 override void paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget)
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125 {
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126 if (!source || !dest)
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127 return;
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128
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129 auto line = QLineF(sourcePoint, destPoint);
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130 if (qFuzzyCompare(line.length(), 0.))
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131 return;
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132
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133 // Draw the line itself
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134 painter.setPen(new QPen(new QBrush(Qt.black), 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin));
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135 painter.drawLine(line);
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136
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137 // Draw the arrows
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138 double angle = .acos(line.dx() / line.length());
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139 if (line.dy() >= 0)
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140 angle = TwoPi - angle;
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141
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142 QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize,
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143 cos(angle + Pi / 3) * arrowSize);
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144 QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
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145 cos(angle + Pi - Pi / 3) * arrowSize);
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146 QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize,
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147 cos(angle - Pi / 3) * arrowSize);
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148 QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize,
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149 cos(angle - Pi + Pi / 3) * arrowSize);
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150
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151 painter.setBrush(new QBrush(Qt.black));
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152 auto p1 = new QPolygonF();
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153 p1.append(line.p1());
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154 p1.append(sourceArrowP1);
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155 p1.append(sourceArrowP2);
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156 painter.drawPolygon(p1);
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157 auto p2 = new QPolygonF();
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158 p2.append(line.p2());
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159 p2.append(destArrowP1);
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160 p2.append(destArrowP2);
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161 painter.drawPolygon(p2);
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162 }
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163
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164 private:
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165 Node source, dest;
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166
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167 QPointF sourcePoint;
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168 QPointF destPoint;
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169 qreal arrowSize;
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170 };
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171