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<h1 class="title">scribblearea.cpp Example File</h1>
<span class="subtitle">touch/fingerpaint/scribblearea.cpp</span>
<!-- $$$touch/fingerpaint/scribblearea.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 <QtWidgets></span>
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB)</span>
<span class="preprocessor">#include <QtPrintSupport/qtprintsupportglobal.h></span>
<span class="preprocessor">#if QT_CONFIG(printdialog)</span>
<span class="preprocessor">#include <QPrinter></span>
<span class="preprocessor">#include <QPrintDialog></span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#include "scribblearea.h"</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> MinimumDiameter <span class="operator">=</span> <span class="number">3.0</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> MaximumDiameter <span class="operator">=</span> <span class="number">50.0</span>;
ScribbleArea<span class="operator">::</span>ScribbleArea(<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)
{
setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_AcceptTouchEvents);
setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_StaticContents);
modified <span class="operator">=</span> <span class="keyword">false</span>;
myPenColors
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"green"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"purple"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"red"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"blue"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"yellow"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"pink"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"orange"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"brown"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"grey"</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"black"</span>);
}
bool ScribbleArea<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> loadedImage;
<span class="keyword">if</span> (<span class="operator">!</span>loadedImage<span class="operator">.</span>load(fileName))
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> newSize <span class="operator">=</span> loadedImage<span class="operator">.</span>size()<span class="operator">.</span>expandedTo(size());
resizeImage(<span class="operator">&</span>loadedImage<span class="operator">,</span> newSize);
image <span class="operator">=</span> loadedImage;
modified <span class="operator">=</span> <span class="keyword">false</span>;
update();
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool ScribbleArea<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="type"><a href="../qtgui/qimage.html">QImage</a></span> visibleImage <span class="operator">=</span> image;
resizeImage(<span class="operator">&</span>visibleImage<span class="operator">,</span> size());
<span class="keyword">if</span> (visibleImage<span class="operator">.</span>save(fileName<span class="operator">,</span> fileFormat)) {
modified <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">return</span> <span class="keyword">true</span>;
} <span class="keyword">else</span> {
<span class="keyword">return</span> <span class="keyword">false</span>;
}
}
<span class="type">void</span> ScribbleArea<span class="operator">::</span>clearImage()
{
image<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>));
modified <span class="operator">=</span> <span class="keyword">true</span>;
update();
}
<span class="type">void</span> ScribbleArea<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>);
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> rect <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rect();
painter<span class="operator">.</span>drawImage(rect<span class="operator">.</span>topLeft()<span class="operator">,</span> image<span class="operator">,</span> rect);
}
<span class="type">void</span> ScribbleArea<span class="operator">::</span>resizeEvent(<span class="type"><a href="../qtgui/qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (width() <span class="operator">></span> image<span class="operator">.</span>width() <span class="operator">|</span><span class="operator">|</span> height() <span class="operator">></span> image<span class="operator">.</span>height()) {
<span class="type">int</span> newWidth <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(width() <span class="operator">+</span> <span class="number">128</span><span class="operator">,</span> image<span class="operator">.</span>width());
<span class="type">int</span> newHeight <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(height() <span class="operator">+</span> <span class="number">128</span><span class="operator">,</span> image<span class="operator">.</span>height());
resizeImage(<span class="operator">&</span>image<span class="operator">,</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(newWidth<span class="operator">,</span> newHeight));
update();
}
<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>resizeEvent(event);
}
<span class="type">void</span> ScribbleArea<span class="operator">::</span>resizeImage(<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> <span class="operator">*</span>image<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> <span class="operator">&</span>newSize)
{
<span class="keyword">if</span> (image<span class="operator">-</span><span class="operator">></span>size() <span class="operator">=</span><span class="operator">=</span> newSize)
<span class="keyword">return</span>;
<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> newImage(newSize<span class="operator">,</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
newImage<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>));
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>newImage);
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> <span class="operator">*</span>image);
<span class="operator">*</span>image <span class="operator">=</span> newImage;
}
<span class="type">void</span> ScribbleArea<span class="operator">::</span>print()
{
<span class="preprocessor">#if QT_CONFIG(printdialog)</span>
<span class="type">QPrinter</span> printer(<span class="type">QPrinter</span><span class="operator">::</span>HighResolution);
<span class="type">QPrintDialog</span> printDialog(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
<span class="keyword">if</span> (printDialog<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted) {
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>printer);
<span class="type"><a href="../qtcore/qrect.html">QRect</a></span> rect <span class="operator">=</span> painter<span class="operator">.</span>viewport();
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> size <span class="operator">=</span> image<span class="operator">.</span>size();
size<span class="operator">.</span>scale(rect<span class="operator">.</span>size()<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio);
painter<span class="operator">.</span>setViewport(rect<span class="operator">.</span>x()<span class="operator">,</span> rect<span class="operator">.</span>y()<span class="operator">,</span> size<span class="operator">.</span>width()<span class="operator">,</span> size<span class="operator">.</span>height());
painter<span class="operator">.</span>setWindow(image<span class="operator">.</span>rect());
painter<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> image);
}
<span class="preprocessor">#endif // QT_CONFIG(printdialog)</span>
}
bool ScribbleArea<span class="operator">::</span>event(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>type()) {
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TouchBegin:
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TouchUpdate:
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TouchEnd:
{
<span class="type"><a href="../qtgui/qtouchevent.html">QTouchEvent</a></span> <span class="operator">*</span>touch <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qtouchevent.html">QTouchEvent</a></span> <span class="operator">*</span><span class="operator">></span>(event);
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtgui/qtouchevent.html">QTouchEvent</a></span><span class="operator">::</span>TouchPoint<span class="operator">></span> touchPoints <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qtouchevent.html">QTouchEvent</a></span> <span class="operator">*</span><span class="operator">></span>(event)<span class="operator">-</span><span class="operator">></span>touchPoints();
foreach (<span class="keyword">const</span> <span class="type"><a href="../qtgui/qtouchevent.html">QTouchEvent</a></span><span class="operator">::</span>TouchPoint <span class="operator">&</span>touchPoint<span class="operator">,</span> touchPoints) {
<span class="keyword">switch</span> (touchPoint<span class="operator">.</span>state()) {
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TouchPointStationary:
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TouchPointReleased:
<span class="comment">// don't do anything if this touch point hasn't moved or has been released</span>
<span class="keyword">continue</span>;
<span class="keyword">default</span>:
{
<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> rect <span class="operator">=</span> touchPoint<span class="operator">.</span>rect();
<span class="keyword">if</span> (rect<span class="operator">.</span>isEmpty()) {
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> diameter <span class="operator">=</span> MaximumDiameter;
<span class="keyword">if</span> (touch<span class="operator">-</span><span class="operator">></span>device()<span class="operator">-</span><span class="operator">></span>capabilities() <span class="operator">&</span> <span class="type"><a href="../qtgui/qtouchdevice.html">QTouchDevice</a></span><span class="operator">::</span>Pressure)
diameter <span class="operator">=</span> MinimumDiameter <span class="operator">+</span> (MaximumDiameter <span class="operator">-</span> MinimumDiameter) <span class="operator">*</span> touchPoint<span class="operator">.</span>pressure();
rect<span class="operator">.</span>setSize(<span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span>(diameter<span class="operator">,</span> diameter));
}
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>image);
painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen);
painter<span class="operator">.</span>setBrush(myPenColors<span class="operator">.</span>at(touchPoint<span class="operator">.</span>id() <span class="operator">%</span> myPenColors<span class="operator">.</span>count()));
painter<span class="operator">.</span>drawEllipse(rect);
painter<span class="operator">.</span>end();
modified <span class="operator">=</span> <span class="keyword">true</span>;
<span class="type">int</span> rad <span class="operator">=</span> <span class="number">2</span>;
update(rect<span class="operator">.</span>toRect()<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="keyword">break</span>;
}
}
<span class="keyword">break</span>;
}
<span class="keyword">default</span>:
<span class="keyword">return</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>event(event);
}
<span class="keyword">return</span> <span class="keyword">true</span>;
}
</pre>
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<!-- @@@touch/fingerpaint/scribblearea.cpp -->
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distrib
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Mageia
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7
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armv7hl
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media
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core-updates
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4950
