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spline.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 2001 by Jorrit Tyberghein 00003 00004 This library is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This library is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public 00015 License along with this library; if not, write to the Free 00016 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 */ 00018 00019 #ifndef __CS_SPLINE_H__ 00020 #define __CS_SPLINE_H__ 00021 00028 #include "csextern.h" 00029 00034 class CS_CRYSTALSPACE_EXPORT csSpline 00035 { 00036 protected: 00037 int dimensions; 00038 int num_points; 00039 float* time_points; 00040 float* points; 00041 bool precalculation_valid; 00042 int idx; 00043 00044 public: 00046 csSpline (int d, int p); 00047 00049 virtual ~csSpline (); 00050 00052 int GetDimensionCount () const { return dimensions; } 00053 00055 int GetPointCount () const { return num_points; } 00056 00061 void InsertPoint (int idx); 00062 00066 void RemovePoint (int idx); 00067 00074 void SetTimeValues (float const* t); 00075 00079 void SetTimeValue (int idx, float t); 00080 00084 float const* GetTimeValues () const { return time_points; } 00085 00089 float GetTimeValue (int idx) const { return GetTimeValues ()[idx]; } 00090 00097 void SetDimensionValues (int dim, float const* d); 00098 00102 void SetDimensionValue (int dim, int idx, float d); 00103 00107 float const* GetDimensionValues (int dim) const 00108 { return &points[dim*num_points]; } 00109 00113 float GetDimensionValue (int dim, int idx) const 00114 { 00115 float const* d = &points[dim*num_points]; 00116 return d[idx]; 00117 } 00118 00122 void SetIndexValues (int idx, float const* d); 00123 00128 float* GetIndexValues (int idx) const; 00129 00133 virtual void Calculate (float time) = 0; 00134 00138 int GetCurrentIndex () const { return idx; } 00139 00144 virtual float GetInterpolatedDimension (int dim) const = 0; 00145 }; 00146 00150 class CS_CRYSTALSPACE_EXPORT csCubicSpline : public csSpline 00151 { 00152 private: 00153 bool derivatives_valid; 00154 float* derivative_points; 00155 00156 // The following values are calculated by Calculate() and 00157 // are used later by GetInterpolatedDimension(). 00158 float A, B, C, D; // For computation of a spline value. 00159 00160 private: 00161 void PrecalculateDerivatives (int dim); 00162 void PrecalculateDerivatives (); 00163 00164 public: 00166 csCubicSpline (int d, int p); 00167 00169 virtual ~csCubicSpline (); 00170 00174 virtual void Calculate (float time); 00175 00180 virtual float GetInterpolatedDimension (int dim) const; 00181 }; 00182 00186 class CS_CRYSTALSPACE_EXPORT csBSpline : public csSpline 00187 { 00188 private: 00189 // The following values are calculated by Calculate() and 00190 // are used later by GetInterpolatedDimension(). 00191 float t; 00192 00193 protected: 00195 virtual float BaseFunction (int i, float t) const; 00196 00197 public: 00199 csBSpline (int d, int p); 00200 00202 virtual ~csBSpline (); 00203 00207 virtual void Calculate (float time); 00208 00213 virtual float GetInterpolatedDimension (int dim) const; 00214 }; 00215 00219 class CS_CRYSTALSPACE_EXPORT csCatmullRomSpline : public csBSpline 00220 { 00221 protected: 00223 virtual float BaseFunction (int i, float t) const; 00224 00225 public: 00227 csCatmullRomSpline (int d, int p) : csBSpline (d, p) { } 00228 00230 virtual ~csCatmullRomSpline () {} 00231 00233 csCatmullRomSpline * Clone(); 00234 00235 }; 00236 00239 #endif // __CS_SPLINE_H__
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