ignition/line_sign.m

   1 function signn=line_sign(x1,y1,x2,y2,x3,y3)\r
   2 \r
   3 % Volodymyr Kondratenko           August 2011\r
   4 \r
   5 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\r
   6 \r
   7 % Defines from which sideof the line going through (x1,y1,x2,y2) lies x3,y3\r
   8 % if sign is positive -> from one side, negative -> from another\r
   9 signn=(y3-y1)*(x2-x1)-(y2-y1)*(x3-x1);\r
  10 end\r
  11 \r
  12 \r
  13 \r
  14 \r
  15 \r
  16 \r