155 lines
4.7 KiB
C++
155 lines
4.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "diagramitem.h"
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#include "arrow.h"
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#include <QGraphicsScene>
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#include <QGraphicsSceneContextMenuEvent>
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#include <QMenu>
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#include <QPainter>
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//! [0]
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DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
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QGraphicsItem *parent)
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: QGraphicsPolygonItem(parent)
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{
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myDiagramType = diagramType;
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myContextMenu = contextMenu;
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QPainterPath path;
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switch (myDiagramType) {
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case StartEnd:
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path.moveTo(200, 50);
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path.arcTo(150, 0, 50, 50, 0, 90);
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path.arcTo(50, 0, 50, 50, 90, 90);
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path.arcTo(50, 50, 50, 50, 180, 90);
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path.arcTo(150, 50, 50, 50, 270, 90);
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path.lineTo(200, 25);
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myPolygon = path.toFillPolygon();
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break;
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case Conditional:
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myPolygon << QPointF(-100, 0) << QPointF(0, 100)
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<< QPointF(100, 0) << QPointF(0, -100)
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<< QPointF(-100, 0);
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break;
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case Step:
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myPolygon << QPointF(-100, -100) << QPointF(100, -100)
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<< QPointF(100, 100) << QPointF(-100, 100)
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<< QPointF(-100, -100);
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break;
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default:
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myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
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<< QPointF(120, 80) << QPointF(70, -80)
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<< QPointF(-120, -80);
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break;
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}
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setPolygon(myPolygon);
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setFlag(QGraphicsItem::ItemIsMovable, true);
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setFlag(QGraphicsItem::ItemIsSelectable, true);
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setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
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}
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//! [0]
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//! [1]
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void DiagramItem::removeArrow(Arrow *arrow)
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{
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int index = arrows.indexOf(arrow);
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if (index != -1)
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arrows.removeAt(index);
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}
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//! [1]
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//! [2]
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void DiagramItem::removeArrows()
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{
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foreach (Arrow *arrow, arrows) {
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arrow->startItem()->removeArrow(arrow);
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arrow->endItem()->removeArrow(arrow);
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scene()->removeItem(arrow);
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delete arrow;
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}
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}
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//! [2]
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//! [3]
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void DiagramItem::addArrow(Arrow *arrow)
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{
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arrows.append(arrow);
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}
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//! [3]
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//! [4]
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QPixmap DiagramItem::image() const
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{
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QPixmap pixmap(250, 250);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setPen(QPen(Qt::black, 8));
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painter.translate(125, 125);
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painter.drawPolyline(myPolygon);
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return pixmap;
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}
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//! [4]
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//! [5]
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void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
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{
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scene()->clearSelection();
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setSelected(true);
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myContextMenu->exec(event->screenPos());
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}
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//! [5]
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//! [6]
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QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == QGraphicsItem::ItemPositionChange) {
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foreach (Arrow *arrow, arrows) {
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arrow->updatePosition();
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}
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}
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return value;
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}
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//! [6]
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