Mercurial > projects > qtd
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/examples/graphicsview/elasticnodes/edge.d Wed Jul 07 22:54:12 2010 +0100 @@ -0,0 +1,171 @@ +/**************************************************************************** +** +** 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; +}; +