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<h1 class="title">raycasting.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/raycasting/raycasting.cpp</span>
<!-- $$$demos/embedded/raycasting/raycasting.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 <math.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="preprocessor">#define WORLD_SIZE 8</span>
<span class="type">int</span> world_map<span class="operator">[</span>WORLD_SIZE<span class="operator">]</span><span class="operator">[</span>WORLD_SIZE<span class="operator">]</span> <span class="operator">=</span> {
{ <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">6</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span> }<span class="operator">,</span>
{ <span class="number">1</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">1</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="operator">,</span> <span class="number">7</span> }<span class="operator">,</span>
{ <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span> }<span class="operator">,</span>
{ <span class="number">6</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="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="operator">,</span> <span class="number">3</span> }<span class="operator">,</span>
{ <span class="number">1</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">1</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">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">7</span><span class="operator">,</span> <span class="number">1</span> }<span class="operator">,</span>
{ <span class="number">3</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="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="operator">,</span> <span class="number">5</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><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">7</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span> }<span class="operator">,</span>
};
<span class="preprocessor">#define TEXTURE_SIZE 64</span>
<span class="preprocessor">#define TEXTURE_BLOCK (TEXTURE_SIZE * TEXTURE_SIZE)</span>
<span class="keyword">class</span> Raycasting: <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
{
<span class="keyword">public</span>:
Raycasting(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
<span class="operator">,</span> angle(<span class="number">0.5</span>)
<span class="operator">,</span> playerPos(<span class="number">1.5</span><span class="operator">,</span> <span class="number">1.5</span>)
<span class="operator">,</span> angleDelta(<span class="number">0</span>)
<span class="operator">,</span> moveDelta(<span class="number">0</span>)
<span class="operator">,</span> touchDevice(<span class="keyword">false</span>) {
<span class="comment">// http://www.areyep.com/RIPandMCS-TextureLibrary.html</span>
textureImg<span class="operator">.</span>load(<span class="string">":/textures.png"</span>);
textureImg <span class="operator">=</span> textureImg<span class="operator">.</span>convertToFormat(<span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32);
Q_ASSERT(textureImg<span class="operator">.</span>width() <span class="operator">=</span><span class="operator">=</span> TEXTURE_SIZE <span class="operator">*</span> <span class="number">2</span>);
Q_ASSERT(textureImg<span class="operator">.</span>bytesPerLine() <span class="operator">=</span><span class="operator">=</span> <span class="number">4</span> <span class="operator">*</span> TEXTURE_SIZE <span class="operator">*</span> <span class="number">2</span>);
textureCount <span class="operator">=</span> textureImg<span class="operator">.</span>height() <span class="operator">/</span> TEXTURE_SIZE;
watch<span class="operator">.</span>start();
ticker<span class="operator">.</span>start(<span class="number">25</span><span class="operator">,</span> <span class="keyword">this</span>);
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_OpaquePaintEvent<span class="operator">,</span> <span class="keyword">true</span>);
setMouseTracking(<span class="keyword">false</span>);
}
<span class="type">void</span> updatePlayer() {
<span class="type">int</span> interval <span class="operator">=</span> <a href="qtglobal.html#qBound">qBound</a>(<span class="number">20</span><span class="operator">,</span> watch<span class="operator">.</span>elapsed()<span class="operator">,</span> <span class="number">250</span>);
watch<span class="operator">.</span>start();
angle <span class="operator">+</span><span class="operator">=</span> angleDelta <span class="operator">*</span> interval <span class="operator">/</span> <span class="number">1000</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> step <span class="operator">=</span> moveDelta <span class="operator">*</span> interval <span class="operator">/</span> <span class="number">1000</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> cos(angle) <span class="operator">*</span> step;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dy <span class="operator">=</span> sin(angle) <span class="operator">*</span> step;
<span class="type"><a href="qpointf.html">QPointF</a></span> pos <span class="operator">=</span> playerPos <span class="operator">+</span> <span class="number">3</span> <span class="operator">*</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(dx<span class="operator">,</span> dy);
<span class="type">int</span> xi <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(pos<span class="operator">.</span>x());
<span class="type">int</span> yi <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(pos<span class="operator">.</span>y());
<span class="keyword">if</span> (world_map<span class="operator">[</span>yi<span class="operator">]</span><span class="operator">[</span>xi<span class="operator">]</span> <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
playerPos <span class="operator">=</span> playerPos <span class="operator">+</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(dx<span class="operator">,</span> dy);
}
<span class="type">void</span> showFps() {
<span class="keyword">static</span> <span class="type"><a href="qtime.html">QTime</a></span> frameTick;
<span class="keyword">static</span> <span class="type">int</span> totalFrame <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">if</span> (<span class="operator">!</span>(totalFrame <span class="operator">&</span> <span class="number">31</span>)) {
<span class="type">int</span> elapsed <span class="operator">=</span> frameTick<span class="operator">.</span>elapsed();
frameTick<span class="operator">.</span>start();
<span class="type">int</span> fps <span class="operator">=</span> <span class="number">32</span> <span class="operator">*</span> <span class="number">1000</span> <span class="operator">/</span> (<span class="number">1</span> <span class="operator">+</span> elapsed);
setWindowTitle(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Raycasting (%1 FPS)"</span>)<span class="operator">.</span>arg(fps));
}
totalFrame<span class="operator">+</span><span class="operator">+</span>;
}
<span class="type">void</span> render() {
<span class="comment">// setup the screen surface</span>
<span class="keyword">if</span> (buffer<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> bufferSize)
buffer <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(bufferSize<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32);
<span class="type">int</span> bufw <span class="operator">=</span> buffer<span class="operator">.</span>width();
<span class="type">int</span> bufh <span class="operator">=</span> buffer<span class="operator">.</span>height();
<span class="keyword">if</span> (bufw <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> bufh <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="comment">// we intentionally cheat here, to avoid detach</span>
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>ptr <span class="operator">=</span> buffer<span class="operator">.</span>bits();
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>start <span class="operator">=</span> (<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span><span class="operator">*</span>)(ptr);
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> stride <span class="operator">=</span> buffer<span class="operator">.</span>bytesPerLine() <span class="operator">/</span> <span class="number">4</span>;
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>finish <span class="operator">=</span> start <span class="operator">+</span> stride <span class="operator">*</span> bufh;
<span class="comment">// prepare the texture pointer</span>
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>src <span class="operator">=</span> textureImg<span class="operator">.</span>bits();
<span class="keyword">const</span> <span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>texsrc <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span><span class="operator">*</span><span class="operator">></span>(src);
<span class="comment">// cast all rays here</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> sina <span class="operator">=</span> sin(angle);
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> cosa <span class="operator">=</span> cos(angle);
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> u <span class="operator">=</span> cosa <span class="operator">-</span> sina;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> v <span class="operator">=</span> sina <span class="operator">+</span> cosa;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> du <span class="operator">=</span> <span class="number">2</span> <span class="operator">*</span> sina <span class="operator">/</span> bufw;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dv <span class="operator">=</span> <span class="operator">-</span><span class="number">2</span> <span class="operator">*</span> cosa <span class="operator">/</span> bufw;
<span class="keyword">for</span> (<span class="type">int</span> ray <span class="operator">=</span> <span class="number">0</span>; ray <span class="operator"><</span> bufw; <span class="operator">+</span><span class="operator">+</span>ray<span class="operator">,</span> u <span class="operator">+</span><span class="operator">=</span> du<span class="operator">,</span> v <span class="operator">+</span><span class="operator">=</span> dv) {
<span class="comment">// every time this ray advances 'u' units in x direction,</span>
<span class="comment">// it also advanced 'v' units in y direction</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> uu <span class="operator">=</span> (u <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="operator">-</span>u : u;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> vv <span class="operator">=</span> (v <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="operator">-</span>v : v;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> duu <span class="operator">=</span> <span class="number">1</span> <span class="operator">/</span> uu;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dvv <span class="operator">=</span> <span class="number">1</span> <span class="operator">/</span> vv;
<span class="type">int</span> stepx <span class="operator">=</span> (u <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="operator">-</span><span class="number">1</span> : <span class="number">1</span>;
<span class="type">int</span> stepy <span class="operator">=</span> (v <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="operator">-</span><span class="number">1</span> : <span class="number">1</span>;
<span class="comment">// the cell in the map that we need to check</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> px <span class="operator">=</span> playerPos<span class="operator">.</span>x();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> py <span class="operator">=</span> playerPos<span class="operator">.</span>y();
<span class="type">int</span> mapx <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(px);
<span class="type">int</span> mapy <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(py);
<span class="comment">// the position and texture for the hit</span>
<span class="type">int</span> texture <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> hitdist <span class="operator">=</span> <span class="number">0.1</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> texofs <span class="operator">=</span> <span class="number">0</span>;
<span class="type">bool</span> dark <span class="operator">=</span> <span class="keyword">false</span>;
<span class="comment">// first hit at constant x and constant y lines</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> distx <span class="operator">=</span> (u <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> (mapx <span class="operator">+</span> <span class="number">1</span> <span class="operator">-</span> px) <span class="operator">*</span> duu : (px <span class="operator">-</span> mapx) <span class="operator">*</span> duu;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> disty <span class="operator">=</span> (v <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> (mapy <span class="operator">+</span> <span class="number">1</span> <span class="operator">-</span> py) <span class="operator">*</span> dvv : (py <span class="operator">-</span> mapy) <span class="operator">*</span> dvv;
<span class="comment">// loop until we hit something</span>
<span class="keyword">while</span> (texture <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="keyword">if</span> (distx <span class="operator">></span> disty) {
<span class="comment">// shorter distance to a hit in constant y line</span>
hitdist <span class="operator">=</span> disty;
disty <span class="operator">+</span><span class="operator">=</span> dvv;
mapy <span class="operator">+</span><span class="operator">=</span> stepy;
texture <span class="operator">=</span> world_map<span class="operator">[</span>mapy<span class="operator">]</span><span class="operator">[</span>mapx<span class="operator">]</span>;
<span class="keyword">if</span> (texture <span class="operator">></span> <span class="number">0</span>) {
dark <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">if</span> (stepy <span class="operator">></span> <span class="number">0</span>) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ofs <span class="operator">=</span> px <span class="operator">+</span> u <span class="operator">*</span> (mapy <span class="operator">-</span> py) <span class="operator">/</span> v;
texofs <span class="operator">=</span> ofs <span class="operator">-</span> floor(ofs);
} <span class="keyword">else</span> {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ofs <span class="operator">=</span> px <span class="operator">+</span> u <span class="operator">*</span> (mapy <span class="operator">+</span> <span class="number">1</span> <span class="operator">-</span> py) <span class="operator">/</span> v;
texofs <span class="operator">=</span> ofs <span class="operator">-</span> floor(ofs);
}
}
} <span class="keyword">else</span> {
<span class="comment">// shorter distance to a hit in constant x line</span>
hitdist <span class="operator">=</span> distx;
distx <span class="operator">+</span><span class="operator">=</span> duu;
mapx <span class="operator">+</span><span class="operator">=</span> stepx;
texture <span class="operator">=</span> world_map<span class="operator">[</span>mapy<span class="operator">]</span><span class="operator">[</span>mapx<span class="operator">]</span>;
<span class="keyword">if</span> (texture <span class="operator">></span> <span class="number">0</span>) {
<span class="keyword">if</span> (stepx <span class="operator">></span> <span class="number">0</span>) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ofs <span class="operator">=</span> py <span class="operator">+</span> v <span class="operator">*</span> (mapx <span class="operator">-</span> px) <span class="operator">/</span> u;
texofs <span class="operator">=</span> ofs <span class="operator">-</span> floor(ofs);
} <span class="keyword">else</span> {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ofs <span class="operator">=</span> py <span class="operator">+</span> v <span class="operator">*</span> (mapx <span class="operator">+</span> <span class="number">1</span> <span class="operator">-</span> px) <span class="operator">/</span> u;
texofs <span class="operator">=</span> ceil(ofs) <span class="operator">-</span> ofs;
}
}
}
}
<span class="comment">// get the texture, note that the texture image</span>
<span class="comment">// has two textures horizontally, "normal" vs "dark"</span>
<span class="type">int</span> col <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(texofs <span class="operator">*</span> TEXTURE_SIZE);
col <span class="operator">=</span> <a href="qtglobal.html#qBound">qBound</a>(<span class="number">0</span><span class="operator">,</span> col<span class="operator">,</span> TEXTURE_SIZE <span class="operator">-</span> <span class="number">1</span>);
texture <span class="operator">=</span> (texture <span class="operator">-</span> <span class="number">1</span>) <span class="operator">%</span> textureCount;
<span class="keyword">const</span> <span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>tex <span class="operator">=</span> texsrc <span class="operator">+</span> TEXTURE_BLOCK <span class="operator">*</span> texture <span class="operator">*</span> <span class="number">2</span> <span class="operator">+</span>
(TEXTURE_SIZE <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> col);
<span class="keyword">if</span> (dark)
tex <span class="operator">+</span><span class="operator">=</span> TEXTURE_SIZE;
<span class="comment">// start from the texture center (horizontally)</span>
<span class="type">int</span> h <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(bufw <span class="operator">/</span> hitdist <span class="operator">/</span> <span class="number">2</span>);
<span class="type">int</span> dy <span class="operator">=</span> (TEXTURE_SIZE <span class="operator"><</span><span class="operator"><</span> <span class="number">12</span>) <span class="operator">/</span> h;
<span class="type">int</span> p1 <span class="operator">=</span> ((TEXTURE_SIZE <span class="operator">/</span> <span class="number">2</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">12</span>) <span class="operator">-</span> dy;
<span class="type">int</span> p2 <span class="operator">=</span> p1 <span class="operator">+</span> dy;
<span class="comment">// start from the screen center (vertically)</span>
<span class="comment">// y1 will go up (decrease), y2 will go down (increase)</span>
<span class="type">int</span> y1 <span class="operator">=</span> bufh <span class="operator">/</span> <span class="number">2</span>;
<span class="type">int</span> y2 <span class="operator">=</span> y1 <span class="operator">+</span> <span class="number">1</span>;
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>pixel1 <span class="operator">=</span> start <span class="operator">+</span> y1 <span class="operator">*</span> stride <span class="operator">+</span> ray;
<span class="type"><a href="qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>pixel2 <span class="operator">=</span> pixel1 <span class="operator">+</span> stride;
<span class="comment">// map the texture to the sliver</span>
<span class="keyword">while</span> (y1 <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> y2 <span class="operator"><</span> bufh <span class="operator">&</span><span class="operator">&</span> p1 <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>) {
<span class="operator">*</span>pixel1 <span class="operator">=</span> tex<span class="operator">[</span>p1 <span class="operator">></span><span class="operator">></span> <span class="number">12</span><span class="operator">]</span>;
<span class="operator">*</span>pixel2 <span class="operator">=</span> tex<span class="operator">[</span>p2 <span class="operator">></span><span class="operator">></span> <span class="number">12</span><span class="operator">]</span>;
p1 <span class="operator">-</span><span class="operator">=</span> dy;
p2 <span class="operator">+</span><span class="operator">=</span> dy;
<span class="operator">-</span><span class="operator">-</span>y1;
<span class="operator">+</span><span class="operator">+</span>y2;
pixel1 <span class="operator">-</span><span class="operator">=</span> stride;
pixel2 <span class="operator">+</span><span class="operator">=</span> stride;
}
<span class="comment">// ceiling and floor</span>
<span class="keyword">for</span> (; pixel1 <span class="operator">></span> start; pixel1 <span class="operator">-</span><span class="operator">=</span> stride)
<span class="operator">*</span>pixel1 <span class="operator">=</span> <a href="qcolor.html#qRgb">qRgb</a>(<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="keyword">for</span> (; pixel2 <span class="operator"><</span> finish; pixel2 <span class="operator">+</span><span class="operator">=</span> stride)
<span class="operator">*</span>pixel2 <span class="operator">=</span> <a href="qcolor.html#qRgb">qRgb</a>(<span class="number">96</span><span class="operator">,</span> <span class="number">96</span><span class="operator">,</span> <span class="number">96</span>);
}
update(<span class="type"><a href="qrect.html">QRect</a></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>)<span class="operator">,</span> bufferSize));
}
<span class="keyword">protected</span>:
<span class="type">void</span> resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span><span class="operator">*</span>) {
<span class="preprocessor">#if defined(Q_OS_WINCE_WM)</span>
touchDevice <span class="operator">=</span> <span class="keyword">true</span>;
<span class="preprocessor">#elif defined(Q_OS_SYMBIAN)</span>
<span class="comment">// FIXME: use HAL</span>
<span class="keyword">if</span> (width() <span class="operator">></span> <span class="number">480</span> <span class="operator">|</span><span class="operator">|</span> height() <span class="operator">></span> <span class="number">480</span>)
touchDevice <span class="operator">=</span> <span class="keyword">true</span>;
<span class="preprocessor">#else</span>
touchDevice <span class="operator">=</span> <span class="keyword">false</span>;
<span class="preprocessor">#endif</span>
<span class="keyword">if</span> (touchDevice) {
<span class="keyword">if</span> (width() <span class="operator"><</span> height()) {
trackPad <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> width()<span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span>);
centerPad <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">3</span> <span class="operator">/</span> <span class="number">4</span>);
bufferSize <span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(width()<span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span>);
} <span class="keyword">else</span> {
trackPad <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> height());
centerPad <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(width() <span class="operator">*</span> <span class="number">3</span> <span class="operator">/</span> <span class="number">4</span><span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span>);
bufferSize <span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> height());
}
} <span class="keyword">else</span> {
trackPad <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
bufferSize <span class="operator">=</span> size();
}
update();
}
<span class="type">void</span> timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span><span class="operator">*</span>) {
updatePlayer();
render();
showFps();
}
<span class="type">void</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(<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_Source);
p<span class="operator">.</span>drawImage(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> buffer<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>rect());
<span class="keyword">if</span> (touchDevice <span class="operator">&</span><span class="operator">&</span> event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>intersects(trackPad)) {
p<span class="operator">.</span>fillRect(trackPad<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
p<span class="operator">.</span>setPen(<span class="type"><a href="qpen.html">QPen</a></span>(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">224</span><span class="operator">,</span> <span class="number">224</span><span class="operator">,</span> <span class="number">224</span>)<span class="operator">,</span> <span class="number">6</span>));
<span class="type">int</span> rad <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(trackPad<span class="operator">.</span>width()<span class="operator">,</span> trackPad<span class="operator">.</span>height()) <span class="operator">*</span> <span class="number">0.3</span>;
p<span class="operator">.</span>drawEllipse(centerPad<span class="operator">,</span> rad<span class="operator">,</span> rad);
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
p<span class="operator">.</span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>gray);
<span class="type"><a href="qpolygon.html">QPolygon</a></span> poly;
poly <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="operator">-</span><span class="number">30</span><span class="operator">,</span> <span class="number">0</span>);
poly <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="operator">-</span><span class="number">40</span>);
poly <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">30</span><span class="operator">,</span> <span class="number">0</span>);
p<span class="operator">.</span>translate(centerPad);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> <span class="number">4</span>; <span class="operator">+</span><span class="operator">+</span>i) {
p<span class="operator">.</span>rotate(<span class="number">90</span>);
p<span class="operator">.</span>translate(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span> <span class="operator">-</span> rad);
p<span class="operator">.</span>drawPolygon(poly);
p<span class="operator">.</span>translate(<span class="number">0</span><span class="operator">,</span> rad <span class="operator">-</span> <span class="number">20</span>);
}
}
p<span class="operator">.</span>end();
}
<span class="type">void</span> keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event) {
event<span class="operator">-</span><span class="operator">></span>accept();
<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)
angleDelta <span class="operator">=</span> <span class="number">1.3</span> <span class="operator">*</span> M_PI;
<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)
angleDelta <span class="operator">=</span> <span class="operator">-</span><span class="number">1.3</span> <span class="operator">*</span> M_PI;
<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)
moveDelta <span class="operator">=</span> <span class="number">2.5</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)
moveDelta <span class="operator">=</span> <span class="operator">-</span><span class="number">2.5</span>;
}
<span class="type">void</span> keyReleaseEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event) {
event<span class="operator">-</span><span class="operator">></span>accept();
<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)
angleDelta <span class="operator">=</span> (angleDelta <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> <span class="number">0</span> : angleDelta;
<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)
angleDelta <span class="operator">=</span> (angleDelta <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="number">0</span> : angleDelta;
<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)
moveDelta <span class="operator">=</span> (moveDelta <span class="operator">></span> <span class="number">0</span>) <span class="operator">?</span> <span class="number">0</span> : moveDelta;
<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)
moveDelta <span class="operator">=</span> (moveDelta <span class="operator"><</span> <span class="number">0</span>) <span class="operator">?</span> <span class="number">0</span> : moveDelta;
}
<span class="type">void</span> mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> centerPad<span class="operator">.</span>x() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>x();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dy <span class="operator">=</span> centerPad<span class="operator">.</span>y() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>y();
angleDelta <span class="operator">=</span> dx <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> M_PI <span class="operator">/</span> width();
moveDelta <span class="operator">=</span> dy <span class="operator">*</span> <span class="number">10</span> <span class="operator">/</span> height();
}
<span class="type">void</span> mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) {
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> centerPad<span class="operator">.</span>x() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>x();
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dy <span class="operator">=</span> centerPad<span class="operator">.</span>y() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>y();
angleDelta <span class="operator">=</span> dx <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> M_PI <span class="operator">/</span> width();
moveDelta <span class="operator">=</span> dy <span class="operator">*</span> <span class="number">10</span> <span class="operator">/</span> height();
}
<span class="type">void</span> mouseReleaseEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span>) {
angleDelta <span class="operator">=</span> <span class="number">0</span>;
moveDelta <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">private</span>:
<span class="type"><a href="qtime.html">QTime</a></span> watch;
<span class="type"><a href="qbasictimer.html">QBasicTimer</a></span> ticker;
<span class="type"><a href="qimage.html">QImage</a></span> buffer;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> angle;
<span class="type"><a href="qpointf.html">QPointF</a></span> playerPos;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> angleDelta;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> moveDelta;
<span class="type"><a href="qimage.html">QImage</a></span> textureImg;
<span class="type">int</span> textureCount;
<span class="type">bool</span> touchDevice;
<span class="type"><a href="qrect.html">QRect</a></span> trackPad;
<span class="type"><a href="qpoint.html">QPoint</a></span> centerPad;
<span class="type"><a href="qsize.html">QSize</a></span> bufferSize;
};
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
Raycasting w;
w<span class="operator">.</span>setWindowTitle(<span class="string">"Raycasting"</span>);
<span class="preprocessor">#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)</span>
w<span class="operator">.</span>showMaximized();
<span class="preprocessor">#else</span>
w<span class="operator">.</span>resize(<span class="number">640</span><span class="operator">,</span> <span class="number">480</span>);
w<span class="operator">.</span>show();
<span class="preprocessor">#endif</span>
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}</pre>
</div>
<!-- @@@demos/embedded/raycasting/raycasting.cpp -->
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