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<h1 class="title">diagramitem.cpp Example File</h1>
<span class="subtitle">graphicsview/diagramscene/diagramitem.cpp</span>
<!-- $$$graphicsview/diagramscene/diagramitem.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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
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<span class="preprocessor">#include "diagramitem.h"</span>
<span class="preprocessor">#include "arrow.h"</span>
<span class="preprocessor">#include <QGraphicsScene></span>
<span class="preprocessor">#include <QGraphicsSceneContextMenuEvent></span>
<span class="preprocessor">#include <QMenu></span>
<span class="preprocessor">#include <QPainter></span>
DiagramItem<span class="operator">::</span>DiagramItem(DiagramType diagramType<span class="operator">,</span> <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>contextMenu<span class="operator">,</span>
<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qgraphicspolygonitem.html">QGraphicsPolygonItem</a></span>(parent)
{
myDiagramType <span class="operator">=</span> diagramType;
myContextMenu <span class="operator">=</span> contextMenu;
<span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path;
<span class="keyword">switch</span> (myDiagramType) {
<span class="keyword">case</span> StartEnd:
path<span class="operator">.</span>moveTo(<span class="number">200</span><span class="operator">,</span> <span class="number">50</span>);
path<span class="operator">.</span>arcTo(<span class="number">150</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">90</span>);
path<span class="operator">.</span>arcTo(<span class="number">50</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">90</span><span class="operator">,</span> <span class="number">90</span>);
path<span class="operator">.</span>arcTo(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">180</span><span class="operator">,</span> <span class="number">90</span>);
path<span class="operator">.</span>arcTo(<span class="number">150</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">270</span><span class="operator">,</span> <span class="number">90</span>);
path<span class="operator">.</span>lineTo(<span class="number">200</span><span class="operator">,</span> <span class="number">25</span>);
myPolygon <span class="operator">=</span> path<span class="operator">.</span>toFillPolygon();
<span class="keyword">break</span>;
<span class="keyword">case</span> Conditional:
myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">100</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> Step:
myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">100</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>);
<span class="keyword">break</span>;
<span class="keyword">default</span>:
myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">120</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">70</span><span class="operator">,</span> <span class="number">80</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">120</span><span class="operator">,</span> <span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">70</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">120</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>);
<span class="keyword">break</span>;
}
setPolygon(myPolygon);
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsMovable<span class="operator">,</span> <span class="keyword">true</span>);
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsSelectable<span class="operator">,</span> <span class="keyword">true</span>);
setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemSendsGeometryChanges<span class="operator">,</span> <span class="keyword">true</span>);
}
<span class="type">void</span> DiagramItem<span class="operator">::</span>removeArrow(Arrow <span class="operator">*</span>arrow)
{
<span class="type">int</span> index <span class="operator">=</span> arrows<span class="operator">.</span>indexOf(arrow);
<span class="keyword">if</span> (index <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
arrows<span class="operator">.</span>removeAt(index);
}
<span class="type">void</span> DiagramItem<span class="operator">::</span>removeArrows()
{
foreach (Arrow <span class="operator">*</span>arrow<span class="operator">,</span> arrows) {
arrow<span class="operator">-</span><span class="operator">></span>startItem()<span class="operator">-</span><span class="operator">></span>removeArrow(arrow);
arrow<span class="operator">-</span><span class="operator">></span>endItem()<span class="operator">-</span><span class="operator">></span>removeArrow(arrow);
scene()<span class="operator">-</span><span class="operator">></span>removeItem(arrow);
<span class="keyword">delete</span> arrow;
}
}
<span class="type">void</span> DiagramItem<span class="operator">::</span>addArrow(Arrow <span class="operator">*</span>arrow)
{
arrows<span class="operator">.</span>append(arrow);
}
<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> DiagramItem<span class="operator">::</span>image() <span class="keyword">const</span>
{
<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap(<span class="number">250</span><span class="operator">,</span> <span class="number">250</span>);
pixmap<span class="operator">.</span>fill(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>transparent);
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>pixmap);
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="number">8</span>));
painter<span class="operator">.</span>translate(<span class="number">125</span><span class="operator">,</span> <span class="number">125</span>);
painter<span class="operator">.</span>drawPolyline(myPolygon);
<span class="keyword">return</span> pixmap;
}
<span class="type">void</span> DiagramItem<span class="operator">::</span>contextMenuEvent(<span class="type"><a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a></span> <span class="operator">*</span>event)
{
scene()<span class="operator">-</span><span class="operator">></span>clearSelection();
setSelected(<span class="keyword">true</span>);
myContextMenu<span class="operator">-</span><span class="operator">></span>exec(event<span class="operator">-</span><span class="operator">></span>screenPos());
}
<span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> DiagramItem<span class="operator">::</span>itemChange(GraphicsItemChange change<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>value)
{
<span class="keyword">if</span> (change <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemPositionChange) {
foreach (Arrow <span class="operator">*</span>arrow<span class="operator">,</span> arrows) {
arrow<span class="operator">-</span><span class="operator">></span>updatePosition();
}
}
<span class="keyword">return</span> value;
}
</pre>
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<!-- @@@graphicsview/diagramscene/diagramitem.cpp -->
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