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...determine the 3rd point of an Equilateral Triangle from the other 2 points?
Autor: Arash Partow
Homepage: http://www.partow.net
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Tip Rating (5):  
     


procedure CreateEquilateralTriangle(x1, y1, x2, y2: Double; var x3, y3: Double);
const 
  
Sin60 = 0.86602540378443864676372317075294;
const 
  
Cos60 = 0.50000000000000000000000000000000;
begin
  
{ Translate for x1,y1 to be origin }
  
x2 := x2 - x1;
  y2 := y2 - y1;
  { Rotate 60 degrees and translate back }
  
x3 := ((x2 * Cos60) - (y2 * Sin60)) + x1;
  y3 := ((y2 * Cos60) + (x2 * Sin60)) + y1;
end;
(* End Of Create Equilateral Triangle *)


 

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