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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <h1 class="title">slippymap.cpp Example File</h1> <span class="small-subtitle">demos/embedded/lightmaps/slippymap.cpp</span> <!-- $$$demos/embedded/lightmaps/slippymap.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 <math.h></span> <span class="preprocessor">#include <QtGui></span> <span class="preprocessor">#include <QtNetwork></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="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <a href="qhash.html#qHash">qHash</a>(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span><span class="operator">&</span> p) { <span class="keyword">return</span> p<span class="operator">.</span>x() <span class="operator">*</span> <span class="number">17</span> <span class="operator">^</span> p<span class="operator">.</span>y(); } <span class="comment">// tile size in pixels</span> <span class="keyword">const</span> <span class="type">int</span> tdim <span class="operator">=</span> <span class="number">256</span>; <span class="type"><a href="qpointf.html">QPointF</a></span> tileForCoordinate(<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<span class="operator">,</span> <span class="type">int</span> zoom) { <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> zn <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span>(<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> zoom); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> tx <span class="operator">=</span> (lng <span class="operator">+</span> <span class="number">180.0</span>) <span class="operator">/</span> <span class="number">360.0</span>; <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ty <span class="operator">=</span> (<span class="number">1.0</span> <span class="operator">-</span> log(tan(lat <span class="operator">*</span> M_PI <span class="operator">/</span> <span class="number">180.0</span>) <span class="operator">+</span> <span class="number">1.0</span> <span class="operator">/</span> cos(lat <span class="operator">*</span> M_PI <span class="operator">/</span> <span class="number">180.0</span>)) <span class="operator">/</span> M_PI) <span class="operator">/</span> <span class="number">2.0</span>; <span class="keyword">return</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(tx <span class="operator">*</span> zn<span class="operator">,</span> ty <span class="operator">*</span> zn); } <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> longitudeFromTile(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> tx<span class="operator">,</span> <span class="type">int</span> zoom) { <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> zn <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span>(<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> zoom); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> lat <span class="operator">=</span> tx <span class="operator">/</span> zn <span class="operator">*</span> <span class="number">360.0</span> <span class="operator">-</span> <span class="number">180.0</span>; <span class="keyword">return</span> lat; } <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> latitudeFromTile(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ty<span class="operator">,</span> <span class="type">int</span> zoom) { <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> zn <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span>(<span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> zoom); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> n <span class="operator">=</span> M_PI <span class="operator">-</span> <span class="number">2</span> <span class="operator">*</span> M_PI <span class="operator">*</span> ty <span class="operator">/</span> zn; <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> lng <span class="operator">=</span> <span class="number">180.0</span> <span class="operator">/</span> M_PI <span class="operator">*</span> atan(<span class="number">0.5</span> <span class="operator">*</span> (exp(n) <span class="operator">-</span> exp(<span class="operator">-</span>n))); <span class="keyword">return</span> lng; } SlippyMap<span class="operator">::</span>SlippyMap(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qobject.html">QObject</a></span>(parent)<span class="operator">,</span> width(<span class="number">400</span>)<span class="operator">,</span> height(<span class="number">300</span>)<span class="operator">,</span> zoom(<span class="number">15</span>)<span class="operator">,</span> latitude(<span class="number">59.9138204</span>)<span class="operator">,</span> longitude(<span class="number">10.7387413</span>) { m_emptyTile <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(tdim<span class="operator">,</span> tdim); m_emptyTile<span class="operator">.</span>fill(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>lightGray); <span class="type"><a href="qnetworkdiskcache.html">QNetworkDiskCache</a></span> <span class="operator">*</span>cache <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qnetworkdiskcache.html">QNetworkDiskCache</a></span>; cache<span class="operator">-</span><span class="operator">></span>setCacheDirectory(<span class="type"><a href="qdesktopservices.html">QDesktopServices</a></span><span class="operator">::</span>storageLocation (<span class="type"><a href="qdesktopservices.html">QDesktopServices</a></span><span class="operator">::</span>CacheLocation)); m_manager<span class="operator">.</span>setCache(cache); connect(<span class="operator">&</span>m_manager<span class="operator">,</span> SIGNAL(finished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))); } <span class="type">void</span> SlippyMap<span class="operator">::</span>invalidate() { <span class="keyword">if</span> (width <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> height <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span>; <span class="type"><a href="qpointf.html">QPointF</a></span> ct <span class="operator">=</span> tileForCoordinate(latitude<span class="operator">,</span> longitude<span class="operator">,</span> zoom); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> tx <span class="operator">=</span> ct<span class="operator">.</span>x(); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ty <span class="operator">=</span> ct<span class="operator">.</span>y(); <span class="comment">// top-left corner of the center tile</span> <span class="type">int</span> xp <span class="operator">=</span> width <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> (tx <span class="operator">-</span> floor(tx)) <span class="operator">*</span> tdim; <span class="type">int</span> yp <span class="operator">=</span> height <span class="operator">/</span> <span class="number">2</span> <span class="operator">-</span> (ty <span class="operator">-</span> floor(ty)) <span class="operator">*</span> tdim; <span class="comment">// first tile vertical and horizontal</span> <span class="type">int</span> xa <span class="operator">=</span> (xp <span class="operator">+</span> tdim <span class="operator">-</span> <span class="number">1</span>) <span class="operator">/</span> tdim; <span class="type">int</span> ya <span class="operator">=</span> (yp <span class="operator">+</span> tdim <span class="operator">-</span> <span class="number">1</span>) <span class="operator">/</span> tdim; <span class="type">int</span> xs <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(tx) <span class="operator">-</span> xa; <span class="type">int</span> ys <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(ty) <span class="operator">-</span> ya; <span class="comment">// offset for top-left tile</span> m_offset <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(xp <span class="operator">-</span> xa <span class="operator">*</span> tdim<span class="operator">,</span> yp <span class="operator">-</span> ya <span class="operator">*</span> tdim); <span class="comment">// last tile vertical and horizontal</span> <span class="type">int</span> xe <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(tx) <span class="operator">+</span> (width <span class="operator">-</span> xp <span class="operator">-</span> <span class="number">1</span>) <span class="operator">/</span> tdim; <span class="type">int</span> ye <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(ty) <span class="operator">+</span> (height <span class="operator">-</span> yp <span class="operator">-</span> <span class="number">1</span>) <span class="operator">/</span> tdim; <span class="comment">// build a rect</span> m_tilesRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(xs<span class="operator">,</span> ys<span class="operator">,</span> xe <span class="operator">-</span> xs <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> ye <span class="operator">-</span> ys <span class="operator">+</span> <span class="number">1</span>); <span class="keyword">if</span> (m_url<span class="operator">.</span>isEmpty()) download(); <span class="keyword">emit</span> updated(<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> width<span class="operator">,</span> height)); } <span class="type">void</span> SlippyMap<span class="operator">::</span>render(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>p<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> <span class="operator">&</span>rect) { <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span><span class="operator">=</span> m_tilesRect<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span><span class="operator">=</span> m_tilesRect<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) { <span class="type"><a href="qpoint.html">QPoint</a></span> tp(x <span class="operator">+</span> m_tilesRect<span class="operator">.</span>left()<span class="operator">,</span> y <span class="operator">+</span> m_tilesRect<span class="operator">.</span>top()); <span class="type"><a href="qrect.html">QRect</a></span> box <span class="operator">=</span> tileRect(tp); <span class="keyword">if</span> (rect<span class="operator">.</span>intersects(box)) { <span class="keyword">if</span> (m_tilePixmaps<span class="operator">.</span>contains(tp)) p<span class="operator">-</span><span class="operator">></span>drawPixmap(box<span class="operator">,</span> m_tilePixmaps<span class="operator">.</span>value(tp)); <span class="keyword">else</span> p<span class="operator">-</span><span class="operator">></span>drawPixmap(box<span class="operator">,</span> m_emptyTile); } } } <span class="type">void</span> SlippyMap<span class="operator">::</span>pan(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>delta) { <span class="type"><a href="qpointf.html">QPointF</a></span> dx <span class="operator">=</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(delta) <span class="operator">/</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(tdim); <span class="type"><a href="qpointf.html">QPointF</a></span> center <span class="operator">=</span> tileForCoordinate(latitude<span class="operator">,</span> longitude<span class="operator">,</span> zoom) <span class="operator">-</span> dx; latitude <span class="operator">=</span> latitudeFromTile(center<span class="operator">.</span>y()<span class="operator">,</span> zoom); longitude <span class="operator">=</span> longitudeFromTile(center<span class="operator">.</span>x()<span class="operator">,</span> zoom); invalidate(); } <span class="type">void</span> SlippyMap<span class="operator">::</span>handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply) { <span class="type"><a href="qimage.html">QImage</a></span> img; <span class="type"><a href="qpoint.html">QPoint</a></span> tp <span class="operator">=</span> reply<span class="operator">-</span><span class="operator">></span>request()<span class="operator">.</span>attribute(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span><span class="operator">::</span>User)<span class="operator">.</span>toPoint(); <span class="type"><a href="qurl.html">QUrl</a></span> url <span class="operator">=</span> reply<span class="operator">-</span><span class="operator">></span>url(); <span class="keyword">if</span> (<span class="operator">!</span>reply<span class="operator">-</span><span class="operator">></span>error()) <span class="keyword">if</span> (<span class="operator">!</span>img<span class="operator">.</span>load(reply<span class="operator">,</span> <span class="number">0</span>)) img <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(); reply<span class="operator">-</span><span class="operator">></span>deleteLater(); m_tilePixmaps<span class="operator">[</span>tp<span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(img); <span class="keyword">if</span> (img<span class="operator">.</span>isNull()) m_tilePixmaps<span class="operator">[</span>tp<span class="operator">]</span> <span class="operator">=</span> m_emptyTile; <span class="keyword">emit</span> updated(tileRect(tp)); <span class="comment">// purge unused spaces</span> <span class="type"><a href="qrect.html">QRect</a></span> bound <span class="operator">=</span> m_tilesRect<span class="operator">.</span>adjusted(<span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">2</span>); foreach(<span class="type"><a href="qpoint.html">QPoint</a></span> tp<span class="operator">,</span> m_tilePixmaps<span class="operator">.</span>keys()) <span class="keyword">if</span> (<span class="operator">!</span>bound<span class="operator">.</span>contains(tp)) m_tilePixmaps<span class="operator">.</span>remove(tp); download(); } <span class="type">void</span> SlippyMap<span class="operator">::</span>download() { <span class="type"><a href="qpoint.html">QPoint</a></span> grab(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span><span class="operator">=</span> m_tilesRect<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span><span class="operator">=</span> m_tilesRect<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) { <span class="type"><a href="qpoint.html">QPoint</a></span> tp <span class="operator">=</span> m_tilesRect<span class="operator">.</span>topLeft() <span class="operator">+</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(x<span class="operator">,</span> y); <span class="keyword">if</span> (<span class="operator">!</span>m_tilePixmaps<span class="operator">.</span>contains(tp)) { grab <span class="operator">=</span> tp; <span class="keyword">break</span>; } } <span class="keyword">if</span> (grab <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>)) { m_url <span class="operator">=</span> <span class="type"><a href="qurl.html">QUrl</a></span>(); <span class="keyword">return</span>; } <span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> <span class="string">"http://tile.openstreetmap.org/%1/%2/%3.png"</span>; m_url <span class="operator">=</span> <span class="type"><a href="qurl.html">QUrl</a></span>(path<span class="operator">.</span>arg(zoom)<span class="operator">.</span>arg(grab<span class="operator">.</span>x())<span class="operator">.</span>arg(grab<span class="operator">.</span>y())); <span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span> request; request<span class="operator">.</span>setUrl(m_url); request<span class="operator">.</span>setRawHeader(<span class="string">"User-Agent"</span><span class="operator">,</span> <span class="string">"Nokia (Qt) Graphics Dojo 1.0"</span>); request<span class="operator">.</span>setAttribute(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span><span class="operator">::</span>User<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span>(grab)); m_manager<span class="operator">.</span>get(request); } <span class="type"><a href="qrect.html">QRect</a></span> SlippyMap<span class="operator">::</span>tileRect(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>tp) { <span class="type"><a href="qpoint.html">QPoint</a></span> t <span class="operator">=</span> tp <span class="operator">-</span> m_tilesRect<span class="operator">.</span>topLeft(); <span class="type">int</span> x <span class="operator">=</span> t<span class="operator">.</span>x() <span class="operator">*</span> tdim <span class="operator">+</span> m_offset<span class="operator">.</span>x(); <span class="type">int</span> y <span class="operator">=</span> t<span class="operator">.</span>y() <span class="operator">*</span> tdim <span class="operator">+</span> m_offset<span class="operator">.</span>y(); <span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(x<span class="operator">,</span> y<span class="operator">,</span> tdim<span class="operator">,</span> tdim); }</pre> </div> <!-- @@@demos/embedded/lightmaps/slippymap.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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