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<hr><h1>track_bezier.h</h1><a href="track__bezier_8h.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><font class="keyword">template</font><<font class="keyword">class</font> CKeyT, <font class="keyword">class</font> T>
<a name="l00049"></a><a class="code" href="classCTrackKeyFramerBezier.html">00049</a> <font class="keyword">class </font><a class="code" href="classCTrackKeyFramerBezier.html">CTrackKeyFramerBezier</a> : <font class="keyword">public</font> ITrackKeyFramer<CKeyT>
00050 {
00051 <font class="keyword">public</font>:
00052
<a name="l00054"></a><a class="code" href="classCTrackKeyFramerBezier.html#a0">00054</a> <font class="keyword">virtual</font> <font class="keyword">const</font> IAnimatedValue& <a class="code" href="classCTrackKeyFramerBezier.html#a0">getValue</a> ()<font class="keyword"> const</font>
00055 <font class="keyword"> </font>{
00056 <font class="keywordflow">return</font> <a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>;
00057 }
00058
00059 <font class="keyword">protected</font>:
00060
<a name="l00061"></a><a class="code" href="classCTrackKeyFramerBezier.html#t0">00061</a> <font class="keyword">typedef</font> <font class="keyword">typename</font> CKeyT::TValueType <a class="code" href="classCTrackKeyFramerBezier.html#t0">TKeyValueType</a>;
00062
00063
00065 <font class="comment">// @{</font>
00066
<a name="l00068"></a><a class="code" href="classCTrackKeyFramerBezier.html#z835_0">00068</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classCTrackKeyFramerBezier.html#z835_0">evalKey</a> ( <font class="keyword">const</font> CKeyT* previous, <font class="keyword">const</font> CKeyT* next,
00069 <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> datePrevious, <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> dateNext,
00070 <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> date )
00071 {
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="namespaceNLMISC.html#a215">NLMISC::clamp</a>(date, 0,1);
00078
00079 <font class="comment">// Bezier interpolation.</font>
00080 <font class="keywordtype">float</font> <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>= date;
00081 <font class="keywordtype">float</font> s2 = <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a> * <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>;
00082 <font class="keywordtype">float</font> s3 = s2 * <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>;
00083 <font class="keywordtype">float</font> u = 1.0f - <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>;
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 <a class="code" href="classCTrackKeyFramerBezier.html#t0">TKeyValueType</a> 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(<a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.Value, previous->Value*u3 + cp0*3.0f*u2*<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>
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(<a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.Value, previous->Value);
00101 <font class="keywordflow">else</font>
00102 <font class="keywordflow">if</font> (next)
00103 copyToValue(<a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.Value, next->Value);
00104 }
00105 }
00106
<a name="l00108"></a><a class="code" href="classCTrackKeyFramerBezier.html#z835_1">00108</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classCTrackKeyFramerBezier.html#z835_1">compile</a>()
00109 {
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="classCTrackKeyFramerBezier.html#o0">00118</a> CAnimatedValueBlendable<T> <a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>;
00119 };
00120
00121
00122
00123 <font class="comment">// ***************************************************************************</font>
<a name="l00131"></a><a class="code" href="classCTrackKeyFramerBezier_3_01CKeyBezierQuat_00_01CQuat_01_4.html">00131</a> <font class="comment"></font><font class="keyword">class </font><a class="code" href="classCTrackKeyFramerBezier.html">CTrackKeyFramerBezier</a><CKeyBezierQuat, CQuat> : <font class="keyword">public</font> ITrackKeyFramer<CKeyBezierQuat>
00132 {
00133 <font class="keyword">public</font>:
00134
<a name="l00136"></a><a class="code" href="classCTrackKeyFramerBezier_3_01CKeyBezierQuat_00_01CQuat_01_4.html#a0">00136</a> <font class="keyword">virtual</font> <font class="keyword">const</font> IAnimatedValue& <a class="code" href="classCTrackKeyFramerBezier.html#a0">getValue</a> ()<font class="keyword"> const</font>
00137 <font class="keyword"> </font>{
00138 <font class="keywordflow">return</font> <a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>;
00139 }
00140
00141 <font class="keyword">protected</font>:
00142
00144 <font class="comment">// @{</font>
00145
<a name="l00147"></a><a class="code" href="classCTrackKeyFramerBezier_3_01CKeyBezierQuat_00_01CQuat_01_4.html#z836_0">00147</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classCTrackKeyFramerBezier.html#z835_0">evalKey</a> ( <font class="keyword">const</font> CKeyBezierQuat* previous, <font class="keyword">const</font> CKeyBezierQuat* next,
00148 <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> datePrevious, <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> dateNext,
00149 <a class="code" href="namespaceNL3D.html#a1">TAnimationTime</a> date )
00150 {
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="namespaceNLMISC.html#a215">NLMISC::clamp</a>(date, 0,1);
00157
00158 <font class="comment">// quad slerp.</font>
00159 <a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.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(<a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.Value, previous->Value);
00165 <font class="keywordflow">else</font>
00166 <font class="keywordflow">if</font> (next)
00167 copyToValue(<a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>.Value, next->Value);
00168 }
00169 }
00170
<a name="l00172"></a><a class="code" href="classCTrackKeyFramerBezier_3_01CKeyBezierQuat_00_01CQuat_01_4.html#z836_1">00172</a> <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classCTrackKeyFramerBezier.html#z835_1">compile</a>()
00173 {
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,<a class="code" href="driver__opengl__extension__def_8h.html#a385">r</a>;
00215
00216 qm = CQuat::lnDif(cur, prev);
00217 qp = CQuat::lnDif(cur, next);
00218 <a class="code" href="driver__opengl__extension__def_8h.html#a385">r</a> = -.25f*(qm+qp);
00219 key.A= cur*(<a class="code" href="driver__opengl__extension__def_8h.html#a385">r</a>.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="classCTrackKeyFramerBezier_3_01CKeyBezierQuat_00_01CQuat_01_4.html#o0">00234</a> CAnimatedValueBlendable<CQuat> <a class="code" href="classCTrackKeyFramerBezier.html#o0">_Value</a>;
00235 };
</pre></div>
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