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<h1 class="title">paintarea.cpp Example File</h1>
<span class="subtitle">tools/plugandpaint/app/paintarea.cpp</span>
<!-- $$$tools/plugandpaint/app/paintarea.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
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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****************************************************************************/</span>
<span class="preprocessor">#include "interfaces.h"</span>
<span class="preprocessor">#include "paintarea.h"</span>
<span class="preprocessor">#include <QPainter></span>
<span class="preprocessor">#include <QMouseEvent></span>
PaintArea<span class="operator">::</span>PaintArea(<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="operator">,</span>
theImage(<span class="number">500</span><span class="operator">,</span> <span class="number">400</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32)<span class="operator">,</span>
color(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue)<span class="operator">,</span>
thickness(<span class="number">3</span>)<span class="operator">,</span>
brushInterface(<span class="number">0</span>)<span class="operator">,</span>
lastPos(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>)
{
setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_StaticContents);
setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_NoBackground);
theImage<span class="operator">.</span>fill(<a href="../qtgui/qcolor.html#qRgb">qRgb</a>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span>));
}
bool PaintArea<span class="operator">::</span>openImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> image;
<span class="keyword">if</span> (<span class="operator">!</span>image<span class="operator">.</span>load(fileName))
<span class="keyword">return</span> <span class="keyword">false</span>;
setImage(image);
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool PaintArea<span class="operator">::</span>saveImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName<span class="operator">,</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>fileFormat)
{
<span class="keyword">return</span> theImage<span class="operator">.</span>save(fileName<span class="operator">,</span> fileFormat);
}
<span class="type">void</span> PaintArea<span class="operator">::</span>setImage(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> <span class="operator">&</span>image)
{
theImage <span class="operator">=</span> image<span class="operator">.</span>convertToFormat(<span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
update();
updateGeometry();
}
<span class="type">void</span> PaintArea<span class="operator">::</span>insertShape(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> <span class="operator">&</span>path)
{
pendingPath <span class="operator">=</span> path;
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CrossCursor);
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> PaintArea<span class="operator">::</span>setBrushColor(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> <span class="operator">&</span>color)
{
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>color <span class="operator">=</span> color;
}
<span class="type">void</span> PaintArea<span class="operator">::</span>setBrushWidth(<span class="type">int</span> width)
{
thickness <span class="operator">=</span> width;
}
<span class="type">void</span> PaintArea<span class="operator">::</span>setBrush(BrushInterface <span class="operator">*</span>brushInterface<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>brush)
{
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>brushInterface <span class="operator">=</span> brushInterface;
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>brush <span class="operator">=</span> brush;
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> PaintArea<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> theImage<span class="operator">.</span>size();
}
<span class="type">void</span> PaintArea<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
{
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>drawImage(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> theImage);
}
<span class="type">void</span> PaintArea<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
<span class="keyword">if</span> (<span class="operator">!</span>pendingPath<span class="operator">.</span>isEmpty()) {
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>theImage);
setupPainter(painter);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> boundingRect <span class="operator">=</span> pendingPath<span class="operator">.</span>boundingRect();
<span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> gradient(boundingRect<span class="operator">.</span>topRight()<span class="operator">,</span>
boundingRect<span class="operator">.</span>bottomLeft());
gradient<span class="operator">.</span>setColorAt(<span class="number">0.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(color<span class="operator">.</span>red()<span class="operator">,</span> color<span class="operator">.</span>green()<span class="operator">,</span>
color<span class="operator">.</span>blue()<span class="operator">,</span> <span class="number">63</span>));
gradient<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(color<span class="operator">.</span>red()<span class="operator">,</span> color<span class="operator">.</span>green()<span class="operator">,</span>
color<span class="operator">.</span>blue()<span class="operator">,</span> <span class="number">191</span>));
painter<span class="operator">.</span>setBrush(gradient);
painter<span class="operator">.</span>translate(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> boundingRect<span class="operator">.</span>center());
painter<span class="operator">.</span>drawPath(pendingPath);
pendingPath <span class="operator">=</span> <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span>();
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
unsetCursor();
<span class="preprocessor">#endif</span>
update();
} <span class="keyword">else</span> {
<span class="keyword">if</span> (brushInterface) {
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>theImage);
setupPainter(painter);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> rect <span class="operator">=</span> brushInterface<span class="operator">-</span><span class="operator">></span>mousePress(brush<span class="operator">,</span> painter<span class="operator">,</span>
event<span class="operator">-</span><span class="operator">></span>pos());
update(rect);
}
lastPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
}
}
}
<span class="type">void</span> PaintArea<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> ((event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton) <span class="operator">&</span><span class="operator">&</span> lastPos <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>)) {
<span class="keyword">if</span> (brushInterface) {
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>theImage);
setupPainter(painter);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> rect <span class="operator">=</span> brushInterface<span class="operator">-</span><span class="operator">></span>mouseMove(brush<span class="operator">,</span> painter<span class="operator">,</span> lastPos<span class="operator">,</span>
event<span class="operator">-</span><span class="operator">></span>pos());
update(rect);
}
lastPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
}
}
<span class="type">void</span> PaintArea<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton <span class="operator">&</span><span class="operator">&</span> lastPos <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>)) {
<span class="keyword">if</span> (brushInterface) {
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>theImage);
setupPainter(painter);
<span class="type"><a href="../qtcore/qrect.html">QRect</a></span> rect <span class="operator">=</span> brushInterface<span class="operator">-</span><span class="operator">></span>mouseRelease(brush<span class="operator">,</span> painter<span class="operator">,</span>
event<span class="operator">-</span><span class="operator">></span>pos());
update(rect);
}
lastPos <span class="operator">=</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>);
}
}
<span class="type">void</span> PaintArea<span class="operator">::</span>setupPainter(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter)
{
painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>);
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(color<span class="operator">,</span> thickness<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SolidLine<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RoundCap<span class="operator">,</span>
<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RoundJoin));
}
</pre>
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<!-- @@@tools/plugandpaint/app/paintarea.cpp -->
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