Mercurial > projects > qtd
diff examples/graphicsview/elasticnodes/node.d @ 373:1f189d0ceab4
merge
author | Max Samukha <maxter@spambox.com> |
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date | Thu, 08 Jul 2010 17:20:02 +0300 |
parents | 12f60887ed15 |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/examples/graphicsview/elasticnodes/node.d Thu Jul 08 17:20:02 2010 +0300 @@ -0,0 +1,203 @@ +/**************************************************************************** +** +** 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; +};