Mercurial > projects > qtd
view examples/graphicsview/elasticnodes/edge.d @ 412:4189f1d51a7d
support for new dmd naming
author | Max Samukha <maxsamukha@gmail.com> |
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date | Thu, 05 May 2011 20:11:26 +0300 |
parents | 12f60887ed15 |
children |
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/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ module edge; import std.math; import qt.gui.QGraphicsItem; import node; static const double Pi = 3.14159265358979323846264338327950288419717; static double TwoPi = 2.0 * Pi; class Edge : QGraphicsItem { public: this(Node sourceNode, Node destNode) { arrowSize = 10; setAcceptedMouseButtons(0); source = sourceNode; dest = destNode; source.addEdge(this); dest.addEdge(this); adjust(); } Node sourceNode() const { return cast(Node)source; } void setSourceNode(Node node) { source = node; adjust(); } Node destNode() const { return cast(Node)dest; } void setDestNode(Node node) { dest = node; adjust(); } void adjust() { if (!source || !dest) return; auto line = QLineF(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0)); qreal length = line.length(); prepareGeometryChange(); if (length > 20.) { auto edgeOffset = QPointF((line.dx() * 10) / length, (line.dy() * 10) / length); sourcePoint = line.p1() + edgeOffset; destPoint = line.p2() - edgeOffset; } else { sourcePoint = destPoint = line.p1(); } } enum { Type = UserType + 2 }; int type() const { return Type; } protected: override QRectF boundingRect() const { if (!source || !dest) return QRectF(); qreal penWidth = 1; qreal extra = (penWidth + arrowSize) / 2.0; return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), destPoint.y() - sourcePoint.y())) .normalized() .adjusted(-extra, -extra, extra, extra); } override void paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget) { if (!source || !dest) return; auto line = QLineF(sourcePoint, destPoint); if (qFuzzyCompare(line.length(), 0.)) return; // Draw the line itself painter.setPen(new QPen(new QBrush(Qt.black), 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)); painter.drawLine(line); // Draw the arrows double angle = .acos(line.dx() / line.length()); if (line.dy() >= 0) angle = TwoPi - angle; QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize, cos(angle + Pi / 3) * arrowSize); QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize, cos(angle + Pi - Pi / 3) * arrowSize); QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize, cos(angle - Pi / 3) * arrowSize); QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize, cos(angle - Pi + Pi / 3) * arrowSize); painter.setBrush(new QBrush(Qt.black)); auto p1 = new QPolygonF(); p1.append(line.p1()); p1.append(sourceArrowP1); p1.append(sourceArrowP2); painter.drawPolygon(p1); auto p2 = new QPolygonF(); p2.append(line.p2()); p2.append(destArrowP1); p2.append(destArrowP2); painter.drawPolygon(p2); } private: Node source, dest; QPointF sourcePoint; QPointF destPoint; qreal arrowSize; };