Mercurial > projects > qtd
comparison examples/graphicsview/elasticnodes/edge.d @ 371:12f60887ed15
add elasticnodes example and necessary changes to the library.
author | Eldar Insafutdinov |
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date | Wed, 07 Jul 2010 22:54:12 +0100 |
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370:7fd4b69378bf | 371:12f60887ed15 |
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1 /**************************************************************************** | |
2 ** | |
3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). | |
4 ** All rights reserved. | |
5 ** Contact: Nokia Corporation (qt-info@nokia.com) | |
6 ** | |
7 ** This file is part of the examples of the Qt Toolkit. | |
8 ** | |
9 ** $QT_BEGIN_LICENSE:LGPL$ | |
10 ** Commercial Usage | |
11 ** Licensees holding valid Qt Commercial licenses may use this file in | |
12 ** accordance with the Qt Commercial License Agreement provided with the | |
13 ** Software or, alternatively, in accordance with the terms contained in | |
14 ** a written agreement between you and Nokia. | |
15 ** | |
16 ** GNU Lesser General Public License Usage | |
17 ** Alternatively, this file may be used under the terms of the GNU Lesser | |
18 ** General Public License version 2.1 as published by the Free Software | |
19 ** Foundation and appearing in the file LICENSE.LGPL included in the | |
20 ** packaging of this file. Please review the following information to | |
21 ** ensure the GNU Lesser General Public License version 2.1 requirements | |
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. | |
23 ** | |
24 ** In addition, as a special exception, Nokia gives you certain additional | |
25 ** rights. These rights are described in the Nokia Qt LGPL Exception | |
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | |
27 ** | |
28 ** GNU General Public License Usage | |
29 ** Alternatively, this file may be used under the terms of the GNU | |
30 ** General Public License version 3.0 as published by the Free Software | |
31 ** Foundation and appearing in the file LICENSE.GPL included in the | |
32 ** packaging of this file. Please review the following information to | |
33 ** ensure the GNU General Public License version 3.0 requirements will be | |
34 ** met: http://www.gnu.org/copyleft/gpl.html. | |
35 ** | |
36 ** If you have questions regarding the use of this file, please contact | |
37 ** Nokia at qt-info@nokia.com. | |
38 ** $QT_END_LICENSE$ | |
39 ** | |
40 ****************************************************************************/ | |
41 module edge; | |
42 | |
43 import std.math; | |
44 import qt.gui.QGraphicsItem; | |
45 | |
46 import node; | |
47 | |
48 static const double Pi = 3.14159265358979323846264338327950288419717; | |
49 static double TwoPi = 2.0 * Pi; | |
50 | |
51 class Edge : QGraphicsItem | |
52 { | |
53 public: | |
54 this(Node sourceNode, Node destNode) | |
55 { | |
56 arrowSize = 10; | |
57 setAcceptedMouseButtons(0); | |
58 source = sourceNode; | |
59 dest = destNode; | |
60 source.addEdge(this); | |
61 dest.addEdge(this); | |
62 adjust(); | |
63 } | |
64 | |
65 Node sourceNode() const | |
66 { | |
67 return cast(Node)source; | |
68 } | |
69 | |
70 void setSourceNode(Node node) | |
71 { | |
72 source = node; | |
73 adjust(); | |
74 } | |
75 | |
76 Node destNode() const | |
77 { | |
78 return cast(Node)dest; | |
79 } | |
80 | |
81 void setDestNode(Node node) | |
82 { | |
83 dest = node; | |
84 adjust(); | |
85 } | |
86 | |
87 void adjust() | |
88 { | |
89 if (!source || !dest) | |
90 return; | |
91 | |
92 auto line = QLineF(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0)); | |
93 qreal length = line.length(); | |
94 | |
95 prepareGeometryChange(); | |
96 | |
97 if (length > 20.) { | |
98 auto edgeOffset = QPointF((line.dx() * 10) / length, (line.dy() * 10) / length); | |
99 sourcePoint = line.p1() + edgeOffset; | |
100 destPoint = line.p2() - edgeOffset; | |
101 } else { | |
102 sourcePoint = destPoint = line.p1(); | |
103 } | |
104 } | |
105 | |
106 enum { Type = UserType + 2 }; | |
107 int type() const { return Type; } | |
108 | |
109 protected: | |
110 override QRectF boundingRect() const | |
111 { | |
112 if (!source || !dest) | |
113 return QRectF(); | |
114 | |
115 qreal penWidth = 1; | |
116 qreal extra = (penWidth + arrowSize) / 2.0; | |
117 | |
118 return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), | |
119 destPoint.y() - sourcePoint.y())) | |
120 .normalized() | |
121 .adjusted(-extra, -extra, extra, extra); | |
122 } | |
123 | |
124 override void paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget) | |
125 { | |
126 if (!source || !dest) | |
127 return; | |
128 | |
129 auto line = QLineF(sourcePoint, destPoint); | |
130 if (qFuzzyCompare(line.length(), 0.)) | |
131 return; | |
132 | |
133 // Draw the line itself | |
134 painter.setPen(new QPen(new QBrush(Qt.black), 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)); | |
135 painter.drawLine(line); | |
136 | |
137 // Draw the arrows | |
138 double angle = .acos(line.dx() / line.length()); | |
139 if (line.dy() >= 0) | |
140 angle = TwoPi - angle; | |
141 | |
142 QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize, | |
143 cos(angle + Pi / 3) * arrowSize); | |
144 QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize, | |
145 cos(angle + Pi - Pi / 3) * arrowSize); | |
146 QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize, | |
147 cos(angle - Pi / 3) * arrowSize); | |
148 QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize, | |
149 cos(angle - Pi + Pi / 3) * arrowSize); | |
150 | |
151 painter.setBrush(new QBrush(Qt.black)); | |
152 auto p1 = new QPolygonF(); | |
153 p1.append(line.p1()); | |
154 p1.append(sourceArrowP1); | |
155 p1.append(sourceArrowP2); | |
156 painter.drawPolygon(p1); | |
157 auto p2 = new QPolygonF(); | |
158 p2.append(line.p2()); | |
159 p2.append(destArrowP1); | |
160 p2.append(destArrowP2); | |
161 painter.drawPolygon(p2); | |
162 } | |
163 | |
164 private: | |
165 Node source, dest; | |
166 | |
167 QPointF sourcePoint; | |
168 QPointF destPoint; | |
169 qreal arrowSize; | |
170 }; | |
171 |