qt5base-lts/examples/graphicsview/diagramscene/diagramitem.cpp

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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include "diagramitem.h"
#include "arrow.h"
//! [0]
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);
setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
}
//! [0]
//! [1]
void DiagramItem::removeArrow(Arrow *arrow)
{
int index = arrows.indexOf(arrow);
if (index != -1)
arrows.removeAt(index);
}
//! [1]
//! [2]
void DiagramItem::removeArrows()
{
foreach (Arrow *arrow, arrows) {
arrow->startItem()->removeArrow(arrow);
arrow->endItem()->removeArrow(arrow);
scene()->removeItem(arrow);
delete arrow;
}
}
//! [2]
//! [3]
void DiagramItem::addArrow(Arrow *arrow)
{
arrows.append(arrow);
}
//! [3]
//! [4]
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;
}
//! [4]
//! [5]
void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
scene()->clearSelection();
setSelected(true);
myContextMenu->exec(event->screenPos());
}
//! [5]
//! [6]
QVariant DiagramItem::itemChange(GraphicsItemChange change,
const QVariant &value)
{
if (change == QGraphicsItem::ItemPositionChange) {
foreach (Arrow *arrow, arrows) {
arrow->updatePosition();
}
}
return value;
}
//! [6]