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<h1 class="title">mouse.cpp Example File</h1>
<span class="subtitle">graphicsview/collidingmice/mouse.cpp</span>
<!-- $$$graphicsview/collidingmice/mouse.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
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd 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,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "mouse.h"</span>
<span class="preprocessor">#include <QGraphicsScene></span>
<span class="preprocessor">#include <QPainter></span>
<span class="preprocessor">#include <QStyleOption></span>
<span class="preprocessor">#include <math.h></span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">double</span> Pi <span class="operator">=</span> <span class="number">3.14159265358979323846264338327950288419717</span>;
<span class="keyword">static</span> <span class="type">double</span> TwoPi <span class="operator">=</span> <span class="number">2.0</span> <span class="operator">*</span> Pi;
<span class="keyword">static</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> normalizeAngle(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angle)
{
<span class="keyword">while</span> (angle <span class="operator"><</span> <span class="number">0</span>)
angle <span class="operator">+</span><span class="operator">=</span> TwoPi;
<span class="keyword">while</span> (angle <span class="operator">></span> TwoPi)
angle <span class="operator">-</span><span class="operator">=</span> TwoPi;
<span class="keyword">return</span> angle;
}
Mouse<span class="operator">::</span>Mouse()
: angle(<span class="number">0</span>)<span class="operator">,</span> speed(<span class="number">0</span>)<span class="operator">,</span> mouseEyeDirection(<span class="number">0</span>)<span class="operator">,</span>
color(qrand() <span class="operator">%</span> <span class="number">256</span><span class="operator">,</span> qrand() <span class="operator">%</span> <span class="number">256</span><span class="operator">,</span> qrand() <span class="operator">%</span> <span class="number">256</span>)
{
setRotation(qrand() <span class="operator">%</span> (<span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>));
}
<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> Mouse<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
{
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> adjust <span class="operator">=</span> <span class="number">0.5</span>;
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">18</span> <span class="operator">-</span> adjust<span class="operator">,</span> <span class="operator">-</span><span class="number">22</span> <span class="operator">-</span> adjust<span class="operator">,</span>
<span class="number">36</span> <span class="operator">+</span> adjust<span class="operator">,</span> <span class="number">60</span> <span class="operator">+</span> adjust);
}
<span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> Mouse<span class="operator">::</span>shape() <span class="keyword">const</span>
{
<span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path;
path<span class="operator">.</span>addRect(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">40</span>);
<span class="keyword">return</span> path;
}
<span class="type">void</span> Mouse<span class="operator">::</span>paint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span><span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>)
{
<span class="comment">// Body</span>
painter<span class="operator">-</span><span class="operator">></span>setBrush(color);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">40</span>);
<span class="comment">// Eyes</span>
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span>);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="number">2</span><span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span>);
<span class="comment">// Nose</span>
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="operator">-</span><span class="number">22</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));
<span class="comment">// Pupils</span>
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">8.0</span> <span class="operator">+</span> mouseEyeDirection<span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="number">4.0</span> <span class="operator">+</span> mouseEyeDirection<span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));
<span class="comment">// Ears</span>
painter<span class="operator">-</span><span class="operator">></span>setBrush(scene()<span class="operator">-</span><span class="operator">></span>collidingItems(<span class="keyword">this</span>)<span class="operator">.</span>isEmpty() <span class="operator">?</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkYellow : <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">16</span>);
painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">16</span>);
<span class="comment">// Tail</span>
<span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span>));
path<span class="operator">.</span>cubicTo(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">22</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">22</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">25</span>);
path<span class="operator">.</span>cubicTo(<span class="number">5</span><span class="operator">,</span> <span class="number">27</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">30</span>);
path<span class="operator">.</span>cubicTo(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">42</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">35</span>);
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
painter<span class="operator">-</span><span class="operator">></span>drawPath(path);
}
<span class="type">void</span> Mouse<span class="operator">::</span>advance(<span class="type">int</span> step)
{
<span class="keyword">if</span> (<span class="operator">!</span>step)
<span class="keyword">return</span>;
<span class="comment">// Don't move too far away</span>
<span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span> lineToCenter(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> mapFromScene(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
<span class="keyword">if</span> (lineToCenter<span class="operator">.</span>length() <span class="operator">></span> <span class="number">150</span>) {
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angleToCenter <span class="operator">=</span> <span class="operator">::</span>acos(lineToCenter<span class="operator">.</span>dx() <span class="operator">/</span> lineToCenter<span class="operator">.</span>length());
<span class="keyword">if</span> (lineToCenter<span class="operator">.</span>dy() <span class="operator"><</span> <span class="number">0</span>)
angleToCenter <span class="operator">=</span> TwoPi <span class="operator">-</span> angleToCenter;
angleToCenter <span class="operator">=</span> normalizeAngle((Pi <span class="operator">-</span> angleToCenter) <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span>);
<span class="keyword">if</span> (angleToCenter <span class="operator"><</span> Pi <span class="operator">&</span><span class="operator">&</span> angleToCenter <span class="operator">></span> Pi <span class="operator">/</span> <span class="number">4</span>) {
<span class="comment">// Rotate left</span>
angle <span class="operator">+</span><span class="operator">=</span> (angle <span class="operator"><</span> <span class="operator">-</span>Pi <span class="operator">/</span> <span class="number">2</span>) <span class="operator">?</span> <span class="number">0.25</span> : <span class="operator">-</span><span class="number">0.25</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (angleToCenter <span class="operator">></span><span class="operator">=</span> Pi <span class="operator">&</span><span class="operator">&</span> angleToCenter <span class="operator"><</span> (Pi <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span> <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">4</span>)) {
<span class="comment">// Rotate right</span>
angle <span class="operator">+</span><span class="operator">=</span> (angle <span class="operator"><</span> Pi <span class="operator">/</span> <span class="number">2</span>) <span class="operator">?</span> <span class="number">0.25</span> : <span class="operator">-</span><span class="number">0.25</span>;
}
} <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">::</span>sin(angle) <span class="operator"><</span> <span class="number">0</span>) {
angle <span class="operator">+</span><span class="operator">=</span> <span class="number">0.25</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">::</span>sin(angle) <span class="operator">></span> <span class="number">0</span>) {
angle <span class="operator">-</span><span class="operator">=</span> <span class="number">0.25</span>;
}
<span class="comment">// Try not to crash with any other mice</span>
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> dangerMice <span class="operator">=</span> scene()<span class="operator">-</span><span class="operator">></span>items(<span class="type"><a href="../qtgui/qpolygonf.html">QPolygonF</a></span>()
<span class="operator"><</span><span class="operator"><</span> mapToScene(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)
<span class="operator"><</span><span class="operator"><</span> mapToScene(<span class="operator">-</span><span class="number">30</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>)
<span class="operator"><</span><span class="operator"><</span> mapToScene(<span class="number">30</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>));
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> dangerMice) {
<span class="keyword">if</span> (item <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>)
<span class="keyword">continue</span>;
<span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span> lineToMouse(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> mapFromItem(item<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angleToMouse <span class="operator">=</span> <span class="operator">::</span>acos(lineToMouse<span class="operator">.</span>dx() <span class="operator">/</span> lineToMouse<span class="operator">.</span>length());
<span class="keyword">if</span> (lineToMouse<span class="operator">.</span>dy() <span class="operator"><</span> <span class="number">0</span>)
angleToMouse <span class="operator">=</span> TwoPi <span class="operator">-</span> angleToMouse;
angleToMouse <span class="operator">=</span> normalizeAngle((Pi <span class="operator">-</span> angleToMouse) <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span>);
<span class="keyword">if</span> (angleToMouse <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> angleToMouse <span class="operator"><</span> Pi <span class="operator">/</span> <span class="number">2</span>) {
<span class="comment">// Rotate right</span>
angle <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (angleToMouse <span class="operator"><</span><span class="operator">=</span> TwoPi <span class="operator">&</span><span class="operator">&</span> angleToMouse <span class="operator">></span> (TwoPi <span class="operator">-</span> Pi <span class="operator">/</span> <span class="number">2</span>)) {
<span class="comment">// Rotate left</span>
angle <span class="operator">-</span><span class="operator">=</span> <span class="number">0.5</span>;
}
}
<span class="comment">// Add some random movement</span>
<span class="keyword">if</span> (dangerMice<span class="operator">.</span>size() <span class="operator">></span> <span class="number">1</span> <span class="operator">&</span><span class="operator">&</span> (qrand() <span class="operator">%</span> <span class="number">10</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="keyword">if</span> (qrand() <span class="operator">%</span> <span class="number">1</span>)
angle <span class="operator">+</span><span class="operator">=</span> (qrand() <span class="operator">%</span> <span class="number">100</span>) <span class="operator">/</span> <span class="number">500.0</span>;
<span class="keyword">else</span>
angle <span class="operator">-</span><span class="operator">=</span> (qrand() <span class="operator">%</span> <span class="number">100</span>) <span class="operator">/</span> <span class="number">500.0</span>;
}
speed <span class="operator">+</span><span class="operator">=</span> (<span class="operator">-</span><span class="number">50</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">100</span>) <span class="operator">/</span> <span class="number">100.0</span>;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> <span class="operator">::</span>sin(angle) <span class="operator">*</span> <span class="number">10</span>;
mouseEyeDirection <span class="operator">=</span> (<a href="../qtcore/qtglobal.html#qAbs">qAbs</a>(dx <span class="operator">/</span> <span class="number">5</span>) <span class="operator"><</span> <span class="number">1</span>) <span class="operator">?</span> <span class="number">0</span> : dx <span class="operator">/</span> <span class="number">5</span>;
setRotation(rotation() <span class="operator">+</span> dx);
setPos(mapToParent(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span>(<span class="number">3</span> <span class="operator">+</span> sin(speed) <span class="operator">*</span> <span class="number">3</span>)));
}
</pre>
</div>
<!-- @@@graphicsview/collidingmice/mouse.cpp -->
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