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<h1 class="title">basictoolsplugin.cpp Example File</h1>
<span class="small-subtitle">tools/plugandpaintplugins/basictools/basictoolsplugin.cpp</span>
<!-- $$$tools/plugandpaintplugins/basictools/basictoolsplugin.cpp-description -->
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<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;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
** &quot;AS IS&quot; 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.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &lt;math.h&gt;</span>
<span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<span class="preprocessor">#include &quot;basictoolsplugin.h&quot;</span>
<span class="keyword">const</span> <span class="type">float</span> Pi <span class="operator">=</span> <span class="number">3.14159f</span>;
<span class="type"><a href="qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>brushes() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qstringlist.html">QStringList</a></span>() <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Pencil&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Air Brush&quot;</span>)
<span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Random Letters&quot;</span>);
}
<span class="type"><a href="qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mousePress(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>brush<span class="operator">,</span> <span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">&amp;</span>painter<span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>pos)
{
<span class="keyword">return</span> mouseMove(brush<span class="operator">,</span> painter<span class="operator">,</span> pos<span class="operator">,</span> pos);
}
<span class="type"><a href="qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mouseMove(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>brush<span class="operator">,</span> <span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">&amp;</span>painter<span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>oldPos<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>newPos)
{
painter<span class="operator">.</span>save();
<span class="type">int</span> rad <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span>;
<span class="type"><a href="qrect.html">QRect</a></span> boundingRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(oldPos<span class="operator">,</span> newPos)<span class="operator">.</span>normalized()
<span class="operator">.</span>adjusted(<span class="operator">-</span>rad<span class="operator">,</span> <span class="operator">-</span>rad<span class="operator">,</span> <span class="operator">+</span>rad<span class="operator">,</span> <span class="operator">+</span>rad);
<span class="type"><a href="qcolor.html">QColor</a></span> color <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>color();
<span class="type">int</span> thickness <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>width();
<span class="type"><a href="qcolor.html">QColor</a></span> transparentColor(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">0</span>);
<span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Pencil&quot;</span>)) {
painter<span class="operator">.</span>drawLine(oldPos<span class="operator">,</span> newPos);
} <span class="keyword">else</span> <span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Air Brush&quot;</span>)) {
<span class="type">int</span> numSteps <span class="operator">=</span> <span class="number">2</span> <span class="operator">+</span> (newPos <span class="operator">-</span> oldPos)<span class="operator">.</span>manhattanLength() <span class="operator">/</span> <span class="number">2</span>;
painter<span class="operator">.</span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(color<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense6Pattern));
painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> numSteps; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">int</span> x <span class="operator">=</span> oldPos<span class="operator">.</span>x() <span class="operator">+</span> i <span class="operator">*</span> (newPos<span class="operator">.</span>x() <span class="operator">-</span> oldPos<span class="operator">.</span>x()) <span class="operator">/</span> (numSteps <span class="operator">-</span> <span class="number">1</span>);
<span class="type">int</span> y <span class="operator">=</span> oldPos<span class="operator">.</span>y() <span class="operator">+</span> i <span class="operator">*</span> (newPos<span class="operator">.</span>y() <span class="operator">-</span> oldPos<span class="operator">.</span>y()) <span class="operator">/</span> (numSteps <span class="operator">-</span> <span class="number">1</span>);
painter<span class="operator">.</span>drawEllipse(x <span class="operator">-</span> (thickness <span class="operator">/</span> <span class="number">2</span>)<span class="operator">,</span> y <span class="operator">-</span> (thickness <span class="operator">/</span> <span class="number">2</span>)<span class="operator">,</span>
thickness<span class="operator">,</span> thickness);
}
} <span class="keyword">else</span> <span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Random Letters&quot;</span>)) {
<span class="type"><a href="qchar.html">QChar</a></span> ch(<span class="char">'A'</span> <span class="operator">+</span> (qrand() <span class="operator">%</span> <span class="number">26</span>));
<span class="type"><a href="qfont.html">QFont</a></span> biggerFont <span class="operator">=</span> painter<span class="operator">.</span>font();
biggerFont<span class="operator">.</span>setBold(<span class="keyword">true</span>);
biggerFont<span class="operator">.</span>setPointSize(biggerFont<span class="operator">.</span>pointSize() <span class="operator">+</span> thickness);
painter<span class="operator">.</span>setFont(biggerFont);
painter<span class="operator">.</span>drawText(newPos<span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span>(ch));
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> metrics(painter<span class="operator">.</span>font());
boundingRect <span class="operator">=</span> metrics<span class="operator">.</span>boundingRect(ch);
boundingRect<span class="operator">.</span>translate(newPos);
boundingRect<span class="operator">.</span>adjust(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">+</span><span class="number">10</span><span class="operator">,</span> <span class="operator">+</span><span class="number">10</span>);
}
painter<span class="operator">.</span>restore();
<span class="keyword">return</span> boundingRect;
}
<span class="type"><a href="qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mouseRelease(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span> <span class="comment">/* brush */</span><span class="operator">,</span>
<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">&amp;</span> <span class="comment">/* painter */</span><span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&amp;</span> <span class="comment">/* pos */</span>)
{
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(<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">0</span>);
}
<span class="type"><a href="qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>shapes() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qstringlist.html">QStringList</a></span>() <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Circle&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Star&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Text...&quot;</span>);
}
<span class="type"><a href="qpainterpath.html">QPainterPath</a></span> BasicToolsPlugin<span class="operator">::</span>generateShape(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>shape<span class="operator">,</span>
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
{
<span class="type"><a href="qpainterpath.html">QPainterPath</a></span> path;
<span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Circle&quot;</span>)) {
path<span class="operator">.</span>addEllipse(<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">50</span>);
} <span class="keyword">else</span> <span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Star&quot;</span>)) {
path<span class="operator">.</span>moveTo(<span class="number">90</span><span class="operator">,</span> <span class="number">50</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>i) {
path<span class="operator">.</span>lineTo(<span class="number">50</span> <span class="operator">+</span> <span class="number">40</span> <span class="operator">*</span> cos(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi)<span class="operator">,</span>
<span class="number">50</span> <span class="operator">+</span> <span class="number">40</span> <span class="operator">*</span> sin(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi));
}
path<span class="operator">.</span>closeSubpath();
} <span class="keyword">else</span> <span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Text...&quot;</span>)) {
<span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getText(parent<span class="operator">,</span> tr(<span class="string">&quot;Text Shape&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Enter text:&quot;</span>)<span class="operator">,</span>
<span class="type"><a href="qlineedit.html">QLineEdit</a></span><span class="operator">::</span>Normal<span class="operator">,</span> tr(<span class="string">&quot;Qt&quot;</span>));
<span class="keyword">if</span> (<span class="operator">!</span>text<span class="operator">.</span>isEmpty()) {
<span class="type"><a href="qfont.html">QFont</a></span> timesFont(<span class="string">&quot;Times&quot;</span><span class="operator">,</span> <span class="number">50</span>);
timesFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="qfont.html">QFont</a></span><span class="operator">::</span>ForceOutline);
path<span class="operator">.</span>addText(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> timesFont<span class="operator">,</span> text);
}
}
<span class="keyword">return</span> path;
}
<span class="type"><a href="qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>filters() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qstringlist.html">QStringList</a></span>() <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Invert Pixels&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Swap RGB&quot;</span>)
<span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Grayscale&quot;</span>);
}
<span class="type"><a href="qimage.html">QImage</a></span> BasicToolsPlugin<span class="operator">::</span>filterImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>filter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qimage.html">QImage</a></span> <span class="operator">&amp;</span>image<span class="operator">,</span>
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span> <span class="comment">/* parent */</span>)
{
<span class="type"><a href="qimage.html">QImage</a></span> result <span class="operator">=</span> image<span class="operator">.</span>convertToFormat(<span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
<span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Invert Pixels&quot;</span>)) {
result<span class="operator">.</span>invertPixels();
} <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Swap RGB&quot;</span>)) {
result <span class="operator">=</span> result<span class="operator">.</span>rgbSwapped();
} <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">&quot;Grayscale&quot;</span>)) {
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator">&lt;</span> result<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator">&lt;</span> result<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">int</span> pixel <span class="operator">=</span> result<span class="operator">.</span>pixel(x<span class="operator">,</span> y);
<span class="type">int</span> gray <span class="operator">=</span> <a href="qcolor.html#qGray">qGray</a>(pixel);
<span class="type">int</span> alpha <span class="operator">=</span> <a href="qcolor.html#qAlpha">qAlpha</a>(pixel);
result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> <a href="qcolor.html#qRgba">qRgba</a>(gray<span class="operator">,</span> gray<span class="operator">,</span> gray<span class="operator">,</span> alpha));
}
}
}
<span class="keyword">return</span> result;
}
<a href="qtplugin.html#Q_EXPORT_PLUGIN2">Q_EXPORT_PLUGIN2</a>(pnp_basictools<span class="operator">,</span> BasicToolsPlugin)</pre>
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