Mercurial > projects > qtd
view examples/graphicsview/elasticnodes/node.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 node; import qt.gui.QRadialGradient, qt.gui.QGraphicsItem; import graphwidget, edge; class Node : QGraphicsItem { public: this(GraphWidget graphWidget) { graph = graphWidget; setFlag(ItemIsMovable); setFlag(ItemSendsGeometryChanges); setCacheMode(DeviceCoordinateCache); setZValue(-1); } void addEdge(Edge edge) { edgeList ~= edge; edge.adjust(); } /* Edge[] edges() const { return edgeList; } */ enum { Type = UserType + 1 }; int type() const { return Type; } void calculateForces() { if (!scene() || scene().mouseGrabberItem() is this) { newPos = pos(); return; } // Sum up all forces pushing this item away qreal xvel = 0; qreal yvel = 0; foreach (IQGraphicsItem item; scene().items()) { auto node = cast(Node)item; if (!node) continue; auto line = QLineF(mapFromItem(node, 0, 0), QPointF(0, 0)); qreal dx = line.dx(); qreal dy = line.dy(); double l = 2.0 * (dx * dx + dy * dy); if (l > 0) { xvel += (dx * 150.0) / l; yvel += (dy * 150.0) / l; } } // Now subtract all forces pulling items together double weight = (edgeList.length + 1) * 10; foreach (Edge edge; edgeList) { QPointF pos; if (edge.sourceNode() == this) pos = mapFromItem(edge.destNode(), 0, 0); else pos = mapFromItem(edge.sourceNode(), 0, 0); xvel += pos.x() / weight; yvel += pos.y() / weight; } if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1) xvel = yvel = 0; QRectF sceneRect = scene().sceneRect(); newPos = pos() + QPointF(xvel, yvel); newPos.x = qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10); newPos.y = qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10); } bool advance() { auto pos_ = pos(); if (newPos == pos_) return false; setPos(newPos); return true; } QRectF boundingRect() const { qreal adjust = 2; return QRectF(-10 - adjust, -10 - adjust, 23 + adjust, 23 + adjust); } QPainterPath shape() const { QPainterPath path; path.addEllipse(-10, -10, 20, 20); return path; } override public void paint(QPainter painter, QStyleOptionGraphicsItem option, QWidget widget = null) { painter.setPen(Qt.NoPen); painter.setBrush(new QBrush(Qt.darkGray)); painter.drawEllipse(-7, -7, 20, 20); auto gradient = new QRadialGradient(-3, -3, 10); if (option.state & QStyle.State_Sunken) { gradient.setCenter(3, 3); gradient.setFocalPoint(3, 3); gradient.setColorAt(1, (new QColor(Qt.yellow)).lighter(120)); gradient.setColorAt(0, (new QColor(Qt.darkYellow)).lighter(120)); } else { gradient.setColorAt(0, new QColor(Qt.yellow)); gradient.setColorAt(1, new QColor(Qt.darkYellow)); } painter.setBrush(gradient); painter.setPen(new QPen(new QBrush(Qt.black), 0)); painter.drawEllipse(-10, -10, 20, 20); } protected: override QVariant itemChange(GraphicsItemChange change, QVariant value) { switch (change) { case ItemPositionHasChanged: foreach (Edge edge; edgeList) edge.adjust(); graph.itemMoved(); break; default: break; }; return QGraphicsItem.itemChange(change, value); } override void mousePressEvent(QGraphicsSceneMouseEvent event) { update(); QGraphicsItem.mousePressEvent(event); } override void mouseReleaseEvent(QGraphicsSceneMouseEvent event) { update(); QGraphicsItem.mouseReleaseEvent(event); } private: Edge[] edgeList; QPointF newPos; GraphWidget graph; };