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<div class="title">cellgrid.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2005-2008 by the FIFE team *</span>
<a name="l00003"></a>00003 <span class="comment"> * http://www.fifengine.de *</span>
<a name="l00004"></a>00004 <span class="comment"> * This file is part of FIFE. *</span>
<a name="l00005"></a>00005 <span class="comment"> * *</span>
<a name="l00006"></a>00006 <span class="comment"> * FIFE is free software; you can redistribute it and/or *</span>
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public *</span>
<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either *</span>
<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version. *</span>
<a name="l00010"></a>00010 <span class="comment"> * *</span>
<a name="l00011"></a>00011 <span class="comment"> * This library is distributed in the hope that it will be useful, *</span>
<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of *</span>
<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *</span>
<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details. *</span>
<a name="l00015"></a>00015 <span class="comment"> * *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public *</span>
<a name="l00017"></a>00017 <span class="comment"> * License along with this library; if not, write to the *</span>
<a name="l00018"></a>00018 <span class="comment"> * Free Software Foundation, Inc., *</span>
<a name="l00019"></a>00019 <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *</span>
<a name="l00020"></a>00020 <span class="comment"> ***************************************************************************/</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">// Standard C++ library includes</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <cassert></span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="comment">// 3rd party library includes</span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="comment">// FIFE includes</span>
<a name="l00028"></a>00028 <span class="comment">// These includes are split up in two parts, separated by one empty line</span>
<a name="l00029"></a>00029 <span class="comment">// First block: files included from the FIFE root src directory</span>
<a name="l00030"></a>00030 <span class="comment">// Second block: files included from the same folder</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include "util/log/logger.h"</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="preprocessor">#include "cellgrid.h"</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="keyword">namespace </span>FIFE {
<a name="l00036"></a>00036 <span class="keyword">static</span> Logger _log(LM_CELLGRID);
<a name="l00037"></a>00037
<a name="l00038"></a>00038 CellGrid::CellGrid(<span class="keywordtype">bool</span> allow_diagonals):
<a name="l00039"></a>00039 FifeClass(),
<a name="l00040"></a>00040 m_matrix(),
<a name="l00041"></a>00041 m_inverse_matrix(),
<a name="l00042"></a>00042 m_xshift(0),
<a name="l00043"></a>00043 m_yshift(0),
<a name="l00044"></a>00044 m_xscale(1),
<a name="l00045"></a>00045 m_yscale(1),
<a name="l00046"></a>00046 m_rotation(0),
<a name="l00047"></a>00047 m_allow_diagonals(allow_diagonals) {
<a name="l00048"></a>00048 updateMatrices();
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050
<a name="l00051"></a>00051 CellGrid::~CellGrid() {
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordtype">void</span> CellGrid::getAccessibleCoordinates(<span class="keyword">const</span> ModelCoordinate& curpos, std::vector<ModelCoordinate>& coordinates) {
<a name="l00055"></a>00055 coordinates.clear();
<a name="l00056"></a>00056 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = curpos.x - 1; x <= curpos.x + 1; x++) {
<a name="l00057"></a>00057 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> y = curpos.y - 1; y <= curpos.y + 1; y++) {
<a name="l00058"></a>00058 ModelCoordinate pt;
<a name="l00059"></a>00059 pt.x = x;
<a name="l00060"></a>00060 pt.y = y;
<a name="l00061"></a>00061 <span class="keywordflow">if</span> (isAccessible(curpos, pt)) {
<a name="l00062"></a>00062 coordinates.push_back(pt);
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordtype">void</span> CellGrid::updateMatrices() {
<a name="l00069"></a>00069 m_matrix.loadRotate(m_rotation, 0.0, 0.0, 1.0);
<a name="l00070"></a>00070 m_matrix.applyScale(m_xscale,m_yscale, 1);
<a name="l00071"></a>00071 m_matrix.applyTranslate(m_xshift, m_yshift, 0);
<a name="l00072"></a>00072 m_inverse_matrix = m_matrix.inverse();
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074
<a name="l00075"></a>00075 ExactModelCoordinate CellGrid::toMapCoordinates(<span class="keyword">const</span> ModelCoordinate& layer_coords) {
<a name="l00076"></a>00076 <span class="keywordflow">return</span> toMapCoordinates(<a class="code" href="namespace_f_i_f_e.html#a95a124ca7a2f1001125bf17551e55fe7">intPt2doublePt</a>(layer_coords));
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keywordtype">int</span> CellGrid::orientation(<span class="keyword">const</span> ExactModelCoordinate& pt, <span class="keyword">const</span> ExactModelCoordinate& pt1, <span class="keyword">const</span> ExactModelCoordinate& pt2) {
<a name="l00080"></a>00080 <span class="keywordtype">double</span> o = (pt2.x - pt1.x) * (pt.y - pt1.y) - (pt.x - pt1.x) * (pt2.y - pt1.y);
<a name="l00081"></a>00081 <span class="keywordflow">if</span> (o > 0.0) {
<a name="l00082"></a>00082 <span class="keywordflow">return</span> 1;
<a name="l00083"></a>00083 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (o < 0.0) {
<a name="l00084"></a>00084 <span class="keywordflow">return</span> -1;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 <span class="keywordflow">return</span> 0;
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="keywordtype">bool</span> CellGrid::ptInTriangle(<span class="keyword">const</span> ExactModelCoordinate& pt, <span class="keyword">const</span> ExactModelCoordinate& pt1, <span class="keyword">const</span> ExactModelCoordinate& pt2, <span class="keyword">const</span> ExactModelCoordinate& pt3) {
<a name="l00090"></a>00090 <span class="keywordtype">double</span> o1 = orientation(pt1, pt2, pt);
<a name="l00091"></a>00091 <span class="keywordtype">double</span> o2 = orientation(pt2, pt3, pt);
<a name="l00092"></a>00092 <span class="keywordtype">double</span> o3 = orientation(pt3, pt1, pt);
<a name="l00093"></a>00093 <span class="keywordtype">bool</span> result = (o1 == o2) && (o2 == o3);
<a name="l00094"></a>00094 FL_DBG(_log, LMsg(<span class="stringliteral">"ptInTriangle, pt="</span>) << pt << <span class="stringliteral">" pt1="</span> << pt1 << <span class="stringliteral">" pt2="</span> << pt2 << <span class="stringliteral">" pt3="</span> << pt3 << <span class="stringliteral">" in="</span> << result);
<a name="l00095"></a>00095 <span class="keywordflow">return</span> result;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 }
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