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doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/cgi-bin/nel-search.cgi">Search</a> </center> +<hr><h1>track_bezier.h</h1><a href="track_bezier_h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 +00007 <font class="comment">/* Copyright, 2001 Nevrax Ltd. +</font>00008 <font class="comment"> * +</font>00009 <font class="comment"> * This file is part of NEVRAX NEL. +</font>00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify +</font>00011 <font class="comment"> * it under the terms of the GNU General Public License as published by +</font>00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option) +</font>00013 <font class="comment"> * any later version. +</font>00014 <font class="comment"> +</font>00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but +</font>00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of +</font>00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +</font>00018 <font class="comment"> * General Public License for more details. +</font>00019 <font class="comment"> +</font>00020 <font class="comment"> * You should have received a copy of the GNU General Public License +</font>00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the +</font>00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +</font>00023 <font class="comment"> * MA 02111-1307, USA. +</font>00024 <font class="comment"> */</font> +00025 +00026 +00027 <font class="preprocessor">#ifndef NL_TRACK_KEYFRAMER_H +</font>00028 <font class="preprocessor"></font><font class="preprocessor">#error "internal file included from track_keyframer.h" +</font>00029 <font class="preprocessor"></font><font class="preprocessor">#endif +</font>00030 <font class="preprocessor"></font> +00031 +00032 +00033 <font class="comment">// ***************************************************************************</font> +00034 <font class="comment">// ***************************************************************************</font> +00035 <font class="comment">// Bezier Keyframer.</font> +00036 <font class="comment">// ***************************************************************************</font> +00037 <font class="comment">// ***************************************************************************</font> +00038 +00039 +00040 <font class="comment">// *************************************************************************** +</font>00048 <font class="comment"></font>template<class CKeyT, class T> +<a name="l00049"></a><a class="code" href="class_CTrackKeyFramerBezier.html">00049</a> <font class="keyword">class </font><a class="code" href="class_CTrackKeyFramerBezier.html">CTrackKeyFramerBezier</a> : <font class="keyword">public</font> <a class="code" href="class_ITrackKeyFramer.html">ITrackKeyFramer</a><CKeyT> +00050 { +00051 <font class="keyword">public</font>: +00052 +<a name="l00054"></a><a class="code" href="class_CTrackKeyFramerBezier.html#a0">00054</a> <font class="keyword">virtual</font> <font class="keyword">const</font> IAnimatedValue& <a class="code" href="class_CTrackKeyFramerBezier.html#a0">getValue</a> ()<font class="keyword"> const +</font>00055 <font class="keyword"> </font>{ +00056 <font class="keywordflow">return</font> _Value; +00057 } +00058 +00059 <font class="keyword">protected</font>: +00060 +<a name="l00061"></a><a class="code" href="class_CTrackKeyFramerBezier.html#t0">00061</a> <font class="keyword">typedef</font> <font class="keyword">typename</font> CKeyT::TValueType TKeyValueType; +00062 +00063 +00065 <font class="comment">// @{</font> +00066 +<a name="l00068"></a><a class="code" href="class_CTrackKeyFramerBezier.html#b0">00068</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="class_CTrackKeyFramerBezier.html#b0">evalKey</a> ( <font class="keyword">const</font> CKeyT* previous, <font class="keyword">const</font> CKeyT* next, +00069 CAnimationTime datePrevious, CAnimationTime dateNext, +00070 CAnimationTime date )<font class="keyword"> +</font>00071 <font class="keyword"> </font>{ +00072 <font class="keywordflow">if</font>(previous && next && !previous->Step) +00073 { +00074 <font class="comment">// lerp from previous to cur.</font> +00075 date-= datePrevious; +00076 date*= previous->OODeltaTime; +00077 <a class="code" href="namespace_NLMISC.html#a177">NLMISC::clamp</a>(date, 0,1); +00078 +00079 <font class="comment">// Bezier interpolation.</font> +00080 <font class="keywordtype">float</font> s= date; +00081 <font class="keywordtype">float</font> s2 = s * s; +00082 <font class="keywordtype">float</font> s3 = s2 * s; +00083 <font class="keywordtype">float</font> u = 1.0f - s; +00084 <font class="keywordtype">float</font> u2 = u * u; +00085 <font class="keywordtype">float</font> u3 = u2 * u; +00086 +00087 <font class="comment">// compute Bezier control points from tangents.</font> +00088 TKeyValueType cp0, cp1; +00089 +00090 <font class="comment">// NB: loop case: dateNext is always > datePrevious....</font> +00091 cp0 = previous->Value + previous->OutTan * (dateNext-datePrevious) / 3.0f; +00092 cp1 = next->Value + next->InTan * (dateNext-datePrevious) / 3.0f; +00093 +00094 copyToValue(_Value.Value, previous->Value*u3 + cp0*3.0f*u2*s +00095 + cp1*3.0f*u*s2 + next->Value*s3); +00096 } +00097 <font class="keywordflow">else</font> +00098 { +00099 <font class="keywordflow">if</font> (previous) +00100 copyToValue(_Value.Value, previous->Value); +00101 <font class="keywordflow">else</font> +00102 <font class="keywordflow">if</font> (next) +00103 copyToValue(_Value.Value, next->Value); +00104 } +00105 } +00106 +<a name="l00108"></a><a class="code" href="class_CTrackKeyFramerBezier.html#b1">00108</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="class_CTrackKeyFramerBezier.html#b1">compile</a>()<font class="keyword"> +</font>00109 <font class="keyword"> </font>{ +00110 ITrackKeyFramer<CKeyT>::compile(); +00111 +00112 <font class="comment">// Nothing else to do!! Tangents are given from user.</font> +00113 } +00114 +00115 <font class="comment">// @}</font> +00116 +00117 <font class="keyword">private</font>: +<a name="l00118"></a><a class="code" href="class_CTrackKeyFramerBezier.html#o0">00118</a> CAnimatedValueBlendable<T> _Value; +00119 }; +00120 +00121 +00122 +00123 <font class="comment">// *************************************************************************** +</font><a name="l00131"></a><a class="code" href="class_CTrackKeyFramerBezier_ltCKeyBezierQuat_x_CQuat_gt.html">00131</a> <font class="comment"></font><font class="keyword">class </font><a class="code" href="class_CTrackKeyFramerBezier.html">CTrackKeyFramerBezier</a><CKeyBezierQuat, CQuat> : <font class="keyword">public</font> <a class="code" href="class_ITrackKeyFramer.html">ITrackKeyFramer</a><CKeyBezierQuat> +00132 { +00133 <font class="keyword">public</font>: +00134 +<a name="l00136"></a><a class="code" href="class_CTrackKeyFramerBezier_ltCKeyBezierQuat_x_CQuat_gt.html#a0">00136</a> <font class="keyword">virtual</font> <font class="keyword">const</font> IAnimatedValue& getValue ()<font class="keyword"> const +</font>00137 <font class="keyword"> </font>{ +00138 <font class="keywordflow">return</font> _Value; +00139 } +00140 +00141 <font class="keyword">protected</font>: +00142 +00144 <font class="comment">// @{</font> +00145 +<a name="l00147"></a><a class="code" href="class_CTrackKeyFramerBezier_ltCKeyBezierQuat_x_CQuat_gt.html#b0">00147</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> evalKey ( <font class="keyword">const</font> CKeyBezierQuat* previous, <font class="keyword">const</font> CKeyBezierQuat* next, +00148 CAnimationTime datePrevious, CAnimationTime dateNext, +00149 CAnimationTime date )<font class="keyword"> +</font>00150 <font class="keyword"> </font>{ +00151 <font class="keywordflow">if</font>(previous && next) +00152 { +00153 <font class="comment">// lerp from previous to cur.</font> +00154 date-= datePrevious; +00155 date*= previous->OODeltaTime; +00156 <a class="code" href="namespace_NLMISC.html#a177">NLMISC::clamp</a>(date, 0,1); +00157 +00158 <font class="comment">// quad slerp.</font> +00159 _Value.Value = CQuat::squad(previous->Value, previous->A, next->A, next->Value, date); +00160 } +00161 <font class="keywordflow">else</font> +00162 { +00163 <font class="keywordflow">if</font> (previous) +00164 copyToValue(_Value.Value, previous->Value); +00165 <font class="keywordflow">else</font> +00166 <font class="keywordflow">if</font> (next) +00167 copyToValue(_Value.Value, next->Value); +00168 } +00169 } +00170 +<a name="l00172"></a><a class="code" href="class_CTrackKeyFramerBezier_ltCKeyBezierQuat_x_CQuat_gt.html#b1">00172</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> compile()<font class="keyword"> +</font>00173 <font class="keyword"> </font>{ +00174 ITrackKeyFramer<CKeyBezierQuat>::compile(); +00175 +00176 <font class="comment">// makeclosest quaternions, Tangents Precompute.</font> +00177 sint nKeys= _MapKey.size(); +00178 <font class="keywordflow">if</font>(nKeys<=1) +00179 <font class="keywordflow">return</font>; +00180 +00181 TMapTimeCKey::iterator it; +00182 TMapTimeCKey::iterator itNext; +00183 TMapTimeCKey::iterator itPrev; +00184 +00185 it= _MapKey.begin(); <font class="comment">// first key.</font> +00186 itNext= it; itNext++; <font class="comment">// second key.</font> +00187 itPrev= _MapKey.end(); <font class="comment">// end key.</font> +00188 +00189 <font class="comment">// Compute all keys.</font> +00190 <font class="keywordflow">for</font>(;it!=_MapKey.end();) +00191 { +00192 +00193 CKeyBezierQuat &key= it->second; +00194 CQuat &cur= key.Value; +00195 +00196 <font class="keywordflow">if</font>(itPrev!= _MapKey.end()) +00197 { +00198 cur.makeClosest(itPrev->second.Value); +00199 } +00200 +00201 CQuat prev, next; +00202 +00203 <font class="comment">// compute prev / next.</font> +00204 <font class="keywordflow">if</font>(itPrev!= _MapKey.end()) +00205 prev= itPrev->second.Value; +00206 <font class="keywordflow">else</font> +00207 prev= itNext->second.Value; +00208 <font class="keywordflow">if</font>(itNext!= _MapKey.end()) +00209 next= itNext->second.Value; +00210 <font class="keywordflow">else</font> +00211 next= itPrev->second.Value; +00212 +00213 <font class="comment">// Compute A.</font> +00214 CQuat qm,qp,r; +00215 +00216 qm = CQuat::lnDif(cur, prev); +00217 qp = CQuat::lnDif(cur, next); +00218 r = -.25f*(qm+qp); +00219 key.A= cur*(r.exp()); +00220 +00221 <font class="comment">// Next key!!</font> +00222 itPrev= it; +00223 it++; +00224 +00225 <font class="keywordflow">if</font>(itNext!= _MapKey.end()) +00226 itNext++; +00227 } +00228 +00229 } +00230 +00231 <font class="comment">// @}</font> +00232 +00233 <font class="keyword">private</font>: +<a name="l00234"></a><a class="code" href="class_CTrackKeyFramerBezier_ltCKeyBezierQuat_x_CQuat_gt.html#o0">00234</a> CAnimatedValueBlendable<CQuat> _Value; +00235 }; +</div></pre> + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |