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<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>
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