Qt:Документация 4.3.2/graphicsview-diagramscene-diagramitem-cpp
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[править] diagramitem.cpp Example File
graphicsview/diagramscene/diagramitem.cpp
/**************************************************************************** ** ** Copyright (C) 2007-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 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 GNU ** General Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, as the sole copyright ** holder for Qt Designer, grants users of the Qt/Eclipse Integration ** plug-in the right for the Qt/Eclipse Integration to link to ** functionality provided by Qt Designer and its related libraries. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include <QtGui> #include "diagramitem.h" #include "arrow.h" DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu, QGraphicsItem *parent, QGraphicsScene *scene) : QGraphicsPolygonItem(parent, scene) { myDiagramType = diagramType; myContextMenu = contextMenu; QPainterPath path; switch (myDiagramType) { case StartEnd: path.moveTo(200, 50); path.arcTo(150, 0, 50, 50, 0, 90); path.arcTo(50, 0, 50, 50, 90, 90); path.arcTo(50, 50, 50, 50, 180, 90); path.arcTo(150, 50, 50, 50, 270, 90); path.lineTo(200, 25); myPolygon = path.toFillPolygon(); break; case Conditional: myPolygon << QPointF(-100, 0) << QPointF(0, 100) << QPointF(100, 0) << QPointF(0, -100) << QPointF(-100, 0); break; case Step: myPolygon << QPointF(-100, -100) << QPointF(100, -100) << QPointF(100, 100) << QPointF(-100, 100) << QPointF(-100, -100); break; default: myPolygon << QPointF(-120, -80) << QPointF(-70, 80) << QPointF(120, 80) << QPointF(70, -80) << QPointF(-120, -80); break; } setPolygon(myPolygon); setFlag(QGraphicsItem::ItemIsMovable, true); setFlag(QGraphicsItem::ItemIsSelectable, true); } void DiagramItem::removeArrow(Arrow *arrow) { int index = arrows.indexOf(arrow); if (index != -1) arrows.removeAt(index); } void DiagramItem::removeArrows() { foreach (Arrow *arrow, arrows) { arrow->startItem()->removeArrow(arrow); arrow->endItem()->removeArrow(arrow); scene()->removeItem(arrow); delete arrow; } } void DiagramItem::addArrow(Arrow *arrow) { arrows.append(arrow); } QPixmap DiagramItem::image() const { QPixmap pixmap(250, 250); pixmap.fill(Qt::transparent); QPainter painter(&pixmap); painter.setPen(QPen(Qt::black, 8)); painter.translate(125, 125); painter.drawPolyline(myPolygon); return pixmap; } void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) { scene()->clearSelection(); setSelected(true); myContextMenu->exec(event->screenPos()); } QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value) { if (change == QGraphicsItem::ItemPositionChange) { foreach (Arrow *arrow, arrows) { arrow->updatePosition(); } } return value; }
Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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