439 lines
32 KiB
HTML
439 lines
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HTML
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<h1 class="title">graphwidget.cpp Example File</h1>
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<span class="small-subtitle">graphicsview/elasticnodes/graphwidget.cpp</span>
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<!-- $$$graphicsview/elasticnodes/graphwidget.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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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 The Qt Company Ltd nor the names of its
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** 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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****************************************************************************/</span>
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<span class="preprocessor">#include "graphwidget.h"</span>
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<span class="preprocessor">#include "edge.h"</span>
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<span class="preprocessor">#include "node.h"</span>
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<span class="preprocessor">#include <QtGui></span>
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<span class="preprocessor">#include <math.h></span>
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GraphWidget<span class="operator">::</span>GraphWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
|
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: <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>(parent)<span class="operator">,</span> timerId(<span class="number">0</span>)
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{
|
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<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>scene <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span>(<span class="keyword">this</span>);
|
|
scene<span class="operator">-</span><span class="operator">></span>setItemIndexMethod(<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span><span class="operator">::</span>NoIndex);
|
|
scene<span class="operator">-</span><span class="operator">></span>setSceneRect(<span class="operator">-</span><span class="number">200</span><span class="operator">,</span> <span class="operator">-</span><span class="number">200</span><span class="operator">,</span> <span class="number">400</span><span class="operator">,</span> <span class="number">400</span>);
|
|
setScene(scene);
|
|
setCacheMode(CacheBackground);
|
|
setViewportUpdateMode(BoundingRectViewportUpdate);
|
|
setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing);
|
|
setTransformationAnchor(AnchorUnderMouse);
|
|
scale(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">0.8</span>)<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">0.8</span>));
|
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setMinimumSize(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>);
|
|
setWindowTitle(tr(<span class="string">"Elastic Nodes"</span>));
|
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|
|
Node <span class="operator">*</span>node1 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node2 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
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Node <span class="operator">*</span>node3 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node4 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
centerNode <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node6 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node7 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node8 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
Node <span class="operator">*</span>node9 <span class="operator">=</span> <span class="keyword">new</span> Node(<span class="keyword">this</span>);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node1);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node2);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node3);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node4);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(centerNode);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node6);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node7);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node8);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(node9);
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node1<span class="operator">,</span> node2));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node2<span class="operator">,</span> node3));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node2<span class="operator">,</span> centerNode));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node3<span class="operator">,</span> node6));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node4<span class="operator">,</span> node1));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node4<span class="operator">,</span> centerNode));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(centerNode<span class="operator">,</span> node6));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(centerNode<span class="operator">,</span> node8));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node6<span class="operator">,</span> node9));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node7<span class="operator">,</span> node4));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node8<span class="operator">,</span> node7));
|
|
scene<span class="operator">-</span><span class="operator">></span>addItem(<span class="keyword">new</span> Edge(node9<span class="operator">,</span> node8));
|
|
|
|
node1<span class="operator">-</span><span class="operator">></span>setPos(<span class="operator">-</span><span class="number">50</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>);
|
|
node2<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>);
|
|
node3<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">50</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>);
|
|
node4<span class="operator">-</span><span class="operator">></span>setPos(<span class="operator">-</span><span class="number">50</span><span class="operator">,</span> <span class="number">0</span>);
|
|
centerNode<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
|
|
node6<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">50</span><span class="operator">,</span> <span class="number">0</span>);
|
|
node7<span class="operator">-</span><span class="operator">></span>setPos(<span class="operator">-</span><span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
|
|
node8<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">0</span><span class="operator">,</span> <span class="number">50</span>);
|
|
node9<span class="operator">-</span><span class="operator">></span>setPos(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>itemMoved()
|
|
{
|
|
<span class="keyword">if</span> (<span class="operator">!</span>timerId)
|
|
timerId <span class="operator">=</span> startTimer(<span class="number">1000</span> <span class="operator">/</span> <span class="number">25</span>);
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event)
|
|
{
|
|
<span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>key()) {
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Up:
|
|
centerNode<span class="operator">-</span><span class="operator">></span>moveBy(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span>);
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Down:
|
|
centerNode<span class="operator">-</span><span class="operator">></span>moveBy(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span>);
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Left:
|
|
centerNode<span class="operator">-</span><span class="operator">></span>moveBy(<span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">0</span>);
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Right:
|
|
centerNode<span class="operator">-</span><span class="operator">></span>moveBy(<span class="number">20</span><span class="operator">,</span> <span class="number">0</span>);
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Plus:
|
|
zoomIn();
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Minus:
|
|
zoomOut();
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Space:
|
|
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Enter:
|
|
shuffle();
|
|
<span class="keyword">break</span>;
|
|
<span class="keyword">default</span>:
|
|
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>keyPressEvent(event);
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
|
|
{
|
|
Q_UNUSED(event);
|
|
|
|
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>Node <span class="operator">*</span><span class="operator">></span> nodes;
|
|
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> scene()<span class="operator">-</span><span class="operator">></span>items()) {
|
|
<span class="keyword">if</span> (Node <span class="operator">*</span>node <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>Node <span class="operator">*</span><span class="operator">></span>(item))
|
|
nodes <span class="operator"><</span><span class="operator"><</span> node;
|
|
}
|
|
|
|
foreach (Node <span class="operator">*</span>node<span class="operator">,</span> nodes)
|
|
node<span class="operator">-</span><span class="operator">></span>calculateForces();
|
|
|
|
<span class="type">bool</span> itemsMoved <span class="operator">=</span> <span class="keyword">false</span>;
|
|
foreach (Node <span class="operator">*</span>node<span class="operator">,</span> nodes) {
|
|
<span class="keyword">if</span> (node<span class="operator">-</span><span class="operator">></span>advance())
|
|
itemsMoved <span class="operator">=</span> <span class="keyword">true</span>;
|
|
}
|
|
|
|
<span class="keyword">if</span> (<span class="operator">!</span>itemsMoved) {
|
|
killTimer(timerId);
|
|
timerId <span class="operator">=</span> <span class="number">0</span>;
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>wheelEvent(<span class="type"><a href="qwheelevent.html">QWheelEvent</a></span> <span class="operator">*</span>event)
|
|
{
|
|
scaleView(pow((<span class="type">double</span>)<span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>event<span class="operator">-</span><span class="operator">></span>delta() <span class="operator">/</span> <span class="number">240.0</span>));
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>drawBackground(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qrectf.html">QRectF</a></span> <span class="operator">&</span>rect)
|
|
{
|
|
Q_UNUSED(rect);
|
|
|
|
<span class="comment">// Shadow</span>
|
|
<span class="type"><a href="qrectf.html">QRectF</a></span> sceneRect <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>sceneRect();
|
|
<span class="type"><a href="qrectf.html">QRectF</a></span> rightShadow(sceneRect<span class="operator">.</span>right()<span class="operator">,</span> sceneRect<span class="operator">.</span>top() <span class="operator">+</span> <span class="number">5</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> sceneRect<span class="operator">.</span>height());
|
|
<span class="type"><a href="qrectf.html">QRectF</a></span> bottomShadow(sceneRect<span class="operator">.</span>left() <span class="operator">+</span> <span class="number">5</span><span class="operator">,</span> sceneRect<span class="operator">.</span>bottom()<span class="operator">,</span> sceneRect<span class="operator">.</span>width()<span class="operator">,</span> <span class="number">5</span>);
|
|
<span class="keyword">if</span> (rightShadow<span class="operator">.</span>intersects(rect) <span class="operator">|</span><span class="operator">|</span> rightShadow<span class="operator">.</span>contains(rect))
|
|
painter<span class="operator">-</span><span class="operator">></span>fillRect(rightShadow<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>darkGray);
|
|
<span class="keyword">if</span> (bottomShadow<span class="operator">.</span>intersects(rect) <span class="operator">|</span><span class="operator">|</span> bottomShadow<span class="operator">.</span>contains(rect))
|
|
painter<span class="operator">-</span><span class="operator">></span>fillRect(bottomShadow<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>darkGray);
|
|
|
|
<span class="comment">// Fill</span>
|
|
<span class="type"><a href="qlineargradient.html">QLinearGradient</a></span> gradient(sceneRect<span class="operator">.</span>topLeft()<span class="operator">,</span> sceneRect<span class="operator">.</span>bottomRight());
|
|
gradient<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
|
|
gradient<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray);
|
|
painter<span class="operator">-</span><span class="operator">></span>fillRect(rect<span class="operator">.</span>intersect(sceneRect)<span class="operator">,</span> gradient);
|
|
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
|
|
painter<span class="operator">-</span><span class="operator">></span>drawRect(sceneRect);
|
|
|
|
<span class="preprocessor">#if !defined(Q_OS_SYMBIAN) && !defined(Q_WS_MAEMO_5)</span>
|
|
<span class="comment">// Text</span>
|
|
<span class="type"><a href="qrectf.html">QRectF</a></span> textRect(sceneRect<span class="operator">.</span>left() <span class="operator">+</span> <span class="number">4</span><span class="operator">,</span> sceneRect<span class="operator">.</span>top() <span class="operator">+</span> <span class="number">4</span><span class="operator">,</span>
|
|
sceneRect<span class="operator">.</span>width() <span class="operator">-</span> <span class="number">4</span><span class="operator">,</span> sceneRect<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">4</span>);
|
|
<span class="type"><a href="qstring.html">QString</a></span> message(tr(<span class="string">"Click and drag the nodes around, and zoom with the mouse "</span>
|
|
<span class="string">"wheel or the '+' and '-' keys"</span>));
|
|
|
|
<span class="type"><a href="qfont.html">QFont</a></span> font <span class="operator">=</span> painter<span class="operator">-</span><span class="operator">></span>font();
|
|
font<span class="operator">.</span>setBold(<span class="keyword">true</span>);
|
|
font<span class="operator">.</span>setPointSize(<span class="number">14</span>);
|
|
painter<span class="operator">-</span><span class="operator">></span>setFont(font);
|
|
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray);
|
|
painter<span class="operator">-</span><span class="operator">></span>drawText(textRect<span class="operator">.</span>translated(<span class="number">2</span><span class="operator">,</span> <span class="number">2</span>)<span class="operator">,</span> message);
|
|
painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
|
|
painter<span class="operator">-</span><span class="operator">></span>drawText(textRect<span class="operator">,</span> message);
|
|
<span class="preprocessor">#endif</span>
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>scaleView(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> scaleFactor)
|
|
{
|
|
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> factor <span class="operator">=</span> transform()<span class="operator">.</span>scale(scaleFactor<span class="operator">,</span> scaleFactor)<span class="operator">.</span>mapRect(<span class="type"><a href="qrectf.html">QRectF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>))<span class="operator">.</span>width();
|
|
<span class="keyword">if</span> (factor <span class="operator"><</span> <span class="number">0.07</span> <span class="operator">|</span><span class="operator">|</span> factor <span class="operator">></span> <span class="number">100</span>)
|
|
<span class="keyword">return</span>;
|
|
|
|
scale(scaleFactor<span class="operator">,</span> scaleFactor);
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>shuffle()
|
|
{
|
|
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> scene()<span class="operator">-</span><span class="operator">></span>items()) {
|
|
<span class="keyword">if</span> (qgraphicsitem_cast<span class="operator"><</span>Node <span class="operator">*</span><span class="operator">></span>(item))
|
|
item<span class="operator">-</span><span class="operator">></span>setPos(<span class="operator">-</span><span class="number">150</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">300</span><span class="operator">,</span> <span class="operator">-</span><span class="number">150</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">300</span>);
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>zoomIn()
|
|
{
|
|
scaleView(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">1.2</span>));
|
|
}
|
|
|
|
<span class="type">void</span> GraphWidget<span class="operator">::</span>zoomOut()
|
|
{
|
|
scaleView(<span class="number">1</span> <span class="operator">/</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">1.2</span>));
|
|
}</pre>
|
|
</div>
|
|
<!-- @@@graphicsview/elasticnodes/graphwidget.cpp -->
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="ft">
|
|
<span></span>
|
|
</div>
|
|
</div>
|
|
<div class="footer">
|
|
<p>
|
|
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
|
<br />
|
|
<p>
|
|
Qt and respective logos are trademarks of The Qt Company Ltd
|
|
in Finland and/or other countries worldwide. All other trademarks are property
|
|
of their respective owners. <a title="Privacy Policy"
|
|
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
|
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|
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|
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</html>
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