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<h1 class="title">lightmaps.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/lightmaps/lightmaps.cpp</span>
<!-- $$$demos/embedded/lightmaps/lightmaps.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtCore></span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include <QtNetwork></span>
<span class="preprocessor">#include <math.h></span>
<span class="preprocessor">#include "lightmaps.h"</span>
<span class="preprocessor">#include "slippymap.h"</span>
<span class="preprocessor">#ifndef M_PI</span>
<span class="preprocessor">#define M_PI 3.14159265358979323846</span>
<span class="preprocessor">#endif</span>
<span class="comment">// how long (milliseconds) the user need to hold (after a tap on the screen)</span>
<span class="comment">// before triggering the magnifying glass feature</span>
<span class="comment">// 701, a prime number, is the sum of 229, 233, 239</span>
<span class="comment">// (all three are also prime numbers, consecutive!)</span>
<span class="preprocessor">#define HOLD_TIME 701</span>
<span class="comment">// maximum size of the magnifier</span>
<span class="comment">// Hint: see above to find why I picked this one :)</span>
<span class="preprocessor">#define MAX_MAGNIFIER 229</span>
LightMaps<span class="operator">::</span>LightMaps(<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> pressed(<span class="keyword">false</span>)<span class="operator">,</span> snapped(<span class="keyword">false</span>)<span class="operator">,</span> zoomed(<span class="keyword">false</span>)<span class="operator">,</span>
invert(<span class="keyword">false</span>)
{
m_normalMap <span class="operator">=</span> <span class="keyword">new</span> SlippyMap(<span class="keyword">this</span>);
m_largeMap <span class="operator">=</span> <span class="keyword">new</span> SlippyMap(<span class="keyword">this</span>);
connect(m_normalMap<span class="operator">,</span> SIGNAL(updated(<span class="type"><a href="qrect.html">QRect</a></span>))<span class="operator">,</span> SLOT(updateMap(<span class="type"><a href="qrect.html">QRect</a></span>)));
connect(m_largeMap<span class="operator">,</span> SIGNAL(updated(<span class="type"><a href="qrect.html">QRect</a></span>))<span class="operator">,</span> SLOT(update()));
}
<span class="type">void</span> LightMaps<span class="operator">::</span>setCenter(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> lat<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> lng)
{
m_normalMap<span class="operator">-</span><span class="operator">></span>latitude <span class="operator">=</span> lat;
m_normalMap<span class="operator">-</span><span class="operator">></span>longitude <span class="operator">=</span> lng;
m_normalMap<span class="operator">-</span><span class="operator">></span>invalidate();
m_largeMap<span class="operator">-</span><span class="operator">></span>latitude <span class="operator">=</span> lat;
m_largeMap<span class="operator">-</span><span class="operator">></span>longitude <span class="operator">=</span> lng;
m_largeMap<span class="operator">-</span><span class="operator">></span>invalidate();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>toggleNightMode()
{
invert <span class="operator">=</span> <span class="operator">!</span>invert;
update();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>updateMap(<span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> <span class="operator">&</span>r)
{
update(r);
}
<span class="type">void</span> LightMaps<span class="operator">::</span>activateZoom()
{
zoomed <span class="operator">=</span> <span class="keyword">true</span>;
tapTimer<span class="operator">.</span>stop();
m_largeMap<span class="operator">-</span><span class="operator">></span>zoom <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>zoom <span class="operator">+</span> <span class="number">1</span>;
m_largeMap<span class="operator">-</span><span class="operator">></span>width <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>width <span class="operator">*</span> <span class="number">2</span>;
m_largeMap<span class="operator">-</span><span class="operator">></span>height <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>height <span class="operator">*</span> <span class="number">2</span>;
m_largeMap<span class="operator">-</span><span class="operator">></span>latitude <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>latitude;
m_largeMap<span class="operator">-</span><span class="operator">></span>longitude <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>longitude;
m_largeMap<span class="operator">-</span><span class="operator">></span>invalidate();
update();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>)
{
m_normalMap<span class="operator">-</span><span class="operator">></span>width <span class="operator">=</span> width();
m_normalMap<span class="operator">-</span><span class="operator">></span>height <span class="operator">=</span> height();
m_normalMap<span class="operator">-</span><span class="operator">></span>invalidate();
m_largeMap<span class="operator">-</span><span class="operator">></span>width <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>width <span class="operator">*</span> <span class="number">2</span>;
m_largeMap<span class="operator">-</span><span class="operator">></span>height <span class="operator">=</span> m_normalMap<span class="operator">-</span><span class="operator">></span>height <span class="operator">*</span> <span class="number">2</span>;
m_largeMap<span class="operator">-</span><span class="operator">></span>invalidate();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qpainter.html">QPainter</a></span> p;
p<span class="operator">.</span>begin(<span class="keyword">this</span>);
m_normalMap<span class="operator">-</span><span class="operator">></span>render(<span class="operator">&</span>p<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>rect());
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
<span class="preprocessor">#if defined(Q_OS_SYMBIAN)</span>
<span class="type"><a href="qfont.html">QFont</a></span> font <span class="operator">=</span> p<span class="operator">.</span>font();
font<span class="operator">.</span>setPixelSize(<span class="number">13</span>);
p<span class="operator">.</span>setFont(font);
<span class="preprocessor">#endif</span>
p<span class="operator">.</span>drawText(rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignBottom <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>TextWordWrap<span class="operator">,</span>
<span class="string">"Map data CCBYSA 2009 OpenStreetMap.org contributors"</span>);
p<span class="operator">.</span>end();
<span class="keyword">if</span> (zoomed) {
<span class="type">int</span> dim <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(width()<span class="operator">,</span> height());
<span class="type">int</span> magnifierSize <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(MAX_MAGNIFIER<span class="operator">,</span> dim <span class="operator">*</span> <span class="number">2</span> <span class="operator">/</span> <span class="number">3</span>);
<span class="type">int</span> radius <span class="operator">=</span> magnifierSize <span class="operator">/</span> <span class="number">2</span>;
<span class="type">int</span> ring <span class="operator">=</span> radius <span class="operator">-</span> <span class="number">15</span>;
<span class="type"><a href="qsize.html">QSize</a></span> box <span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(magnifierSize<span class="operator">,</span> magnifierSize);
<span class="comment">// reupdate our mask</span>
<span class="keyword">if</span> (maskPixmap<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> box) {
maskPixmap <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(box);
maskPixmap<span class="operator">.</span>fill(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent);
<span class="type"><a href="qradialgradient.html">QRadialGradient</a></span> g;
g<span class="operator">.</span>setCenter(radius<span class="operator">,</span> radius);
g<span class="operator">.</span>setFocalPoint(radius<span class="operator">,</span> radius);
g<span class="operator">.</span>setRadius(radius);
g<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<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="operator">,</span> <span class="number">0</span>));
g<span class="operator">.</span>setColorAt(<span class="number">0.5</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">128</span><span class="operator">,</span> <span class="number">128</span><span class="operator">,</span> <span class="number">128</span><span class="operator">,</span> <span class="number">255</span>));
<span class="type"><a href="qpainter.html">QPainter</a></span> mask(<span class="operator">&</span>maskPixmap);
mask<span class="operator">.</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing);
mask<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Source);
mask<span class="operator">.</span>setBrush(g);
mask<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
mask<span class="operator">.</span>drawRect(maskPixmap<span class="operator">.</span>rect());
mask<span class="operator">.</span>setBrush(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent));
mask<span class="operator">.</span>drawEllipse(g<span class="operator">.</span>center()<span class="operator">,</span> ring<span class="operator">,</span> ring);
mask<span class="operator">.</span>end();
}
<span class="type"><a href="qpoint.html">QPoint</a></span> center <span class="operator">=</span> dragPos <span class="operator">-</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> radius);
center <span class="operator">=</span> center <span class="operator">+</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> radius <span class="operator">/</span> <span class="number">2</span>);
<span class="type"><a href="qpoint.html">QPoint</a></span> corner <span class="operator">=</span> center <span class="operator">-</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(radius<span class="operator">,</span> radius);
<span class="type"><a href="qpoint.html">QPoint</a></span> xy <span class="operator">=</span> center <span class="operator">*</span> <span class="number">2</span> <span class="operator">-</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(radius<span class="operator">,</span> radius);
<span class="comment">// only set the dimension to the magnified portion</span>
<span class="keyword">if</span> (zoomPixmap<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> box) {
zoomPixmap <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(box);
zoomPixmap<span class="operator">.</span>fill(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray);
}
<span class="keyword">if</span> (<span class="keyword">true</span>) {
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="operator">&</span>zoomPixmap);
p<span class="operator">.</span>translate(<span class="operator">-</span>xy);
m_largeMap<span class="operator">-</span><span class="operator">></span>render(<span class="operator">&</span>p<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(xy<span class="operator">,</span> box));
p<span class="operator">.</span>end();
}
<span class="type"><a href="qpainterpath.html">QPainterPath</a></span> clipPath;
clipPath<span class="operator">.</span>addEllipse(center<span class="operator">,</span> ring<span class="operator">,</span> ring);
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>);
p<span class="operator">.</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing);
p<span class="operator">.</span>setClipPath(clipPath);
p<span class="operator">.</span>drawPixmap(corner<span class="operator">,</span> zoomPixmap);
p<span class="operator">.</span>setClipping(<span class="keyword">false</span>);
p<span class="operator">.</span>drawPixmap(corner<span class="operator">,</span> maskPixmap);
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>gray);
p<span class="operator">.</span>drawPath(clipPath);
}
<span class="keyword">if</span> (invert) {
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>);
p<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Difference);
p<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
p<span class="operator">.</span>end();
}
}
<span class="type">void</span> LightMaps<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>)
{
<span class="keyword">if</span> (<span class="operator">!</span>zoomed)
activateZoom();
update();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>mousePressEvent(<span class="type"><a href="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="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton)
<span class="keyword">return</span>;
pressed <span class="operator">=</span> snapped <span class="operator">=</span> <span class="keyword">true</span>;
pressPos <span class="operator">=</span> dragPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
tapTimer<span class="operator">.</span>stop();
tapTimer<span class="operator">.</span>start(HOLD_TIME<span class="operator">,</span> <span class="keyword">this</span>);
}
<span class="type">void</span> LightMaps<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (<span class="operator">!</span>event<span class="operator">-</span><span class="operator">></span>buttons())
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="operator">!</span>zoomed) {
<span class="keyword">if</span> (<span class="operator">!</span>pressed <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>snapped) {
<span class="type"><a href="qpoint.html">QPoint</a></span> delta <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> pressPos;
pressPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
m_normalMap<span class="operator">-</span><span class="operator">></span>pan(delta);
<span class="keyword">return</span>;
} <span class="keyword">else</span> {
<span class="keyword">const</span> <span class="type">int</span> threshold <span class="operator">=</span> <span class="number">10</span>;
<span class="type"><a href="qpoint.html">QPoint</a></span> delta <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> pressPos;
<span class="keyword">if</span> (snapped) {
snapped <span class="operator">&</span><span class="operator">=</span> delta<span class="operator">.</span>x() <span class="operator"><</span> threshold;
snapped <span class="operator">&</span><span class="operator">=</span> delta<span class="operator">.</span>y() <span class="operator"><</span> threshold;
snapped <span class="operator">&</span><span class="operator">=</span> delta<span class="operator">.</span>x() <span class="operator">></span> <span class="operator">-</span>threshold;
snapped <span class="operator">&</span><span class="operator">=</span> delta<span class="operator">.</span>y() <span class="operator">></span> <span class="operator">-</span>threshold;
}
<span class="keyword">if</span> (<span class="operator">!</span>snapped)
tapTimer<span class="operator">.</span>stop();
}
} <span class="keyword">else</span> {
dragPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
update();
}
}
<span class="type">void</span> LightMaps<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>)
{
zoomed <span class="operator">=</span> <span class="keyword">false</span>;
update();
}
<span class="type">void</span> LightMaps<span class="operator">::</span>keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (<span class="operator">!</span>zoomed) {
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Left)
m_normalMap<span class="operator">-</span><span class="operator">></span>pan(<span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">20</span><span class="operator">,</span> <span class="number">0</span>));
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Right)
m_normalMap<span class="operator">-</span><span class="operator">></span>pan(<span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">0</span>));
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Up)
m_normalMap<span class="operator">-</span><span class="operator">></span>pan(<span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span>));
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Down)
m_normalMap<span class="operator">-</span><span class="operator">></span>pan(<span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span>));
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Z <span class="operator">|</span><span class="operator">|</span> event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Select) {
dragPos <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span>);
activateZoom();
}
} <span class="keyword">else</span> {
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Z <span class="operator">|</span><span class="operator">|</span> event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Select) {
zoomed <span class="operator">=</span> <span class="keyword">false</span>;
update();
}
<span class="type"><a href="qpoint.html">QPoint</a></span> delta(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Left)
delta <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">15</span><span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Right)
delta <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">15</span><span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Up)
delta <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">15</span>);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Down)
delta <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">15</span>);
<span class="keyword">if</span> (delta <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)) {
dragPos <span class="operator">+</span><span class="operator">=</span> delta;
update();
}
}
}</pre>
</div>
<!-- @@@demos/embedded/lightmaps/lightmaps.cpp -->
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