d4/d06/get__distance__from__point__to__plane_8c_source.html

00001 // Function written by Oliver Grant, 2011
00002 #include <glylib.h>
00003 //#include <mylib.h>
00004 //#include <molecules.h>
00005 /************** get_distance_from_point_to_plane() ******************/
00006 double get_distance_from_point_to_plane(plane p, coord_3D pt, int absl){
00007
00008 double sum, sqroot, d;
00009
00010 sum=(p.A)*(pt.i) + (p.B)*(pt.j) + (p.C)*(pt.k);
00011 sqroot=sqrt(p.A*p.A + p.B*p.B + p.C*p.C);
00012 d=sum/sqroot;
00013
00014 //get absolute value
00015 if (absl==1){
00016         if (d<0) {d=d*(-1);}
00017         }
00018 return d;
00019 }