Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

diagramitem.cpp Example File
graphicsview/diagramscene/diagramitem.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** 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, 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.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** 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 © 2008 Trolltech Trademarks
Qt 4.3.5