00001 // This is gel/vmal/vmal_operators.h 00002 #ifndef vmal_operators_h_ 00003 #define vmal_operators_h_ 00004 //-------------------------------------------------------------------------------- 00005 //: 00006 // \file 00007 // 00008 // \author 00009 // L. Guichard 00010 // \verbatim 00011 // Modifications: 00012 // Feb.2002 - Peter Vanroose - brief doxygen comment placed on single line 00013 // \endverbatim 00014 //-------------------------------------------------------------------------------- 00015 #include <vnl/vnl_double_3.h> 00016 00017 class vmal_operators 00018 { 00019 public: 00020 00021 vmal_operators(); 00022 00023 ~vmal_operators(); 00024 //----------------------------------------------------------------------------- 00025 //: Project the point (x0,y0) on the segment [(ax,ay),(bx,by)]. 00026 // (x,y) is the projected point. It returns the orthogonal distance. 00027 // (x,y)=(-1,-1) if the projected point does not belong to the segment. 00028 //----------------------------------------------------------------------------- 00029 static double project_point(double x0,double y0, 00030 double ax,double ay, 00031 double bx,double by, 00032 double *x,double *y); 00033 00034 //----------------------------------------------------------------------------- 00035 //: Project the point x on the segment [a,b]. 00036 // px is the projected point. It returns the orthogonal distance. 00037 // px=(-1,-1) if the projected point does not belong to the segment. 00038 //----------------------------------------------------------------------------- 00039 static bool project_point(vnl_double_3 &x, 00040 vnl_double_3 &a, 00041 vnl_double_3 &b, 00042 vnl_double_3 &px); 00043 00044 //----------------------------------------------------------------------------- 00045 //: Look if the two segments cross. 00046 //----------------------------------------------------------------------------- 00047 static bool cross_seg(double f1x,double f1y,double f2x,double f2y,//first segment 00048 double s1x,double s1y,double s2x,double s2y);//second segment 00049 00050 //----------------------------------------------------------------------------- 00051 //: Compute the crossing point "inter" of a segment and a line. 00052 // alpha is the angle between the two. 00053 // It returns true iff the line crosses the segment inside [start_seg,end_seg]. 00054 //----------------------------------------------------------------------------- 00055 static bool line_cross_seg(vnl_double_3 start_seg, vnl_double_3 end_seg, 00056 vnl_double_3 & line_equ, vnl_double_3 & inter, 00057 double &alpha); 00058 }; 00059 00060 #endif //vmal_operators_h_
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