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<h1 class="title">renderarea.cpp Example File</h1>
<span class="subtitle">painting/transformations/renderarea.cpp</span>
<!-- $$$painting/transformations/renderarea.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.
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** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "renderarea.h"</span>
<span class="preprocessor">#include <QPainter></span>
<span class="preprocessor">#include <QPaintEvent></span>
RenderArea<span class="operator">::</span>RenderArea(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
<span class="type"><a href="../qtgui/qfont.html">QFont</a></span> newFont <span class="operator">=</span> font();
newFont<span class="operator">.</span>setPixelSize(<span class="number">12</span>);
setFont(newFont);
<span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fontMetrics(newFont);
xBoundingRect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(tr(<span class="string">"x"</span>));
yBoundingRect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(tr(<span class="string">"y"</span>));
}
<span class="type">void</span> RenderArea<span class="operator">::</span>setOperations(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span>Operation<span class="operator">></span> <span class="operator">&</span>operations)
{
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>operations <span class="operator">=</span> operations;
update();
}
<span class="type">void</span> RenderArea<span class="operator">::</span>setShape(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> <span class="operator">&</span>shape)
{
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>shape <span class="operator">=</span> shape;
update();
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> RenderArea<span class="operator">::</span>minimumSizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">182</span><span class="operator">,</span> <span class="number">182</span>);
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> RenderArea<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">232</span><span class="operator">,</span> <span class="number">232</span>);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing);
painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white));
painter<span class="operator">.</span>translate(<span class="number">66</span><span class="operator">,</span> <span class="number">66</span>);
painter<span class="operator">.</span>save();
transformPainter(painter);
drawShape(painter);
painter<span class="operator">.</span>restore();
drawOutline(painter);
transformPainter(painter);
drawCoordinates(painter);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>drawCoordinates(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter)
{
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);
painter<span class="operator">.</span>drawLine(<span class="number">0</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">0</span>);
painter<span class="operator">.</span>drawLine(<span class="number">48</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">0</span>);
painter<span class="operator">.</span>drawLine(<span class="number">48</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">0</span>);
painter<span class="operator">.</span>drawText(<span class="number">60</span> <span class="operator">-</span> xBoundingRect<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span>
<span class="number">0</span> <span class="operator">+</span> xBoundingRect<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> tr(<span class="string">"x"</span>));
painter<span class="operator">.</span>drawLine(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>);
painter<span class="operator">.</span>drawLine(<span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="number">48</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>);
painter<span class="operator">.</span>drawLine(<span class="number">2</span><span class="operator">,</span> <span class="number">48</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>);
painter<span class="operator">.</span>drawText(<span class="number">0</span> <span class="operator">-</span> yBoundingRect<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span>
<span class="number">60</span> <span class="operator">+</span> yBoundingRect<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> tr(<span class="string">"y"</span>));
}
<span class="type">void</span> RenderArea<span class="operator">::</span>drawOutline(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter)
{
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkGreen);
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DashLine);
painter<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>drawRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>drawShape(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter)
{
painter<span class="operator">.</span>fillPath(shape<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>transformPainter(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter)
{
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> operations<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">switch</span> (operations<span class="operator">[</span>i<span class="operator">]</span>) {
<span class="keyword">case</span> Translate:
painter<span class="operator">.</span>translate(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> Scale:
painter<span class="operator">.</span>scale(<span class="number">0.75</span><span class="operator">,</span> <span class="number">0.75</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> Rotate:
painter<span class="operator">.</span>rotate(<span class="number">60</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> NoTransformation:
<span class="keyword">default</span>:
;
}
}
}
</pre>
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<!-- @@@painting/transformations/renderarea.cpp -->
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