csgeom/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 00032 class csSpline 00033 { 00034 protected: 00035 int dimensions; 00036 int num_points; 00037 float* time_points; 00038 float* points; 00039 bool precalculation_valid; 00040 int idx; 00041 00042 public: 00044 csSpline (int d, int p); 00045 00047 virtual ~csSpline (); 00048 00050 int GetDimensionCount () { return dimensions; } 00051 00053 int GetPointCount () { return num_points; } 00054 00059 void InsertPoint (int idx); 00060 00064 void RemovePoint (int idx); 00065 00072 void SetTimeValues (float* t); 00073 00077 void SetTimeValue (int idx, float t); 00078 00082 float* GetTimeValues () { return time_points; } 00083 00087 float GetTimeValue (int idx) { return GetTimeValues ()[idx]; } 00088 00095 void SetDimensionValues (int dim, float* d); 00096 00100 void SetDimensionValue (int dim, int idx, float d); 00101 00105 float* GetDimensionValues (int dim) { return &points[dim*num_points]; } 00106 00110 float GetDimensionValue (int dim, int idx) 00111 { 00112 float* d = &points[dim*num_points]; 00113 return d[idx]; 00114 } 00115 00119 virtual void Calculate (float time) = 0; 00120 00124 int GetCurrentIndex () { return idx; } 00125 00130 virtual float GetInterpolatedDimension (int dim) = 0; 00131 }; 00132 00136 class csCubicSpline : public csSpline 00137 { 00138 private: 00139 bool derivatives_valid; 00140 float* derivative_points; 00141 00142 // The following values are calculated by Calculate() and 00143 // are used later by GetInterpolatedDimension(). 00144 float A, B, C, D; // For computation of a spline value. 00145 00146 private: 00147 void PrecalculateDerivatives (int dim); 00148 void PrecalculateDerivatives (); 00149 00150 public: 00152 csCubicSpline (int d, int p); 00153 00155 virtual ~csCubicSpline (); 00156 00160 virtual void Calculate (float time); 00161 00166 virtual float GetInterpolatedDimension (int dim); 00167 }; 00168 00172 class csBSpline : public csSpline 00173 { 00174 private: 00175 // The following values are calculated by Calculate() and 00176 // are used later by GetInterpolatedDimension(). 00177 float t; 00178 00179 protected: 00181 virtual float BaseFunction (int i, float t); 00182 00183 public: 00185 csBSpline (int d, int p); 00186 00188 virtual ~csBSpline (); 00189 00193 virtual void Calculate (float time); 00194 00199 virtual float GetInterpolatedDimension (int dim); 00200 }; 00201 00205 class csCatmullRomSpline : public csBSpline 00206 { 00207 protected: 00209 virtual float BaseFunction (int i, float t); 00210 00211 public: 00213 csCatmullRomSpline (int d, int p) : csBSpline (d, p) { } 00214 00216 virtual ~csCatmullRomSpline () {} 00217 }; 00218 00221 #endif // __CS_SPLINE_H__ 00222
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