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...Determine the vertex angle made by two 2D segments?
Autor: Arash Partow
Homepage: http://www.partow.net
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Tip Rating (10):  
     


function VertexAngle(x1, y1, x2, y2, x3, y3: Double): Double;
var 
  
Dist: Double;
begin
  
(* Quantify coordinates *)
  
x1 := x1 - x2;
  x3 := x3 - x2;
  y1 := y1 - y2;
  y3 := y3 - y2;

  (* Calculate Lay Distance *)
  
Dist := (x1 * x1 + y1 * y1) * (x3 * x3 + y3 * y3);

  if Dist = 0 then Result := 0.0
  else
    
Result := ArcCos((x1 * x3 + y1 * y3) / sqrt(Dist)) * _180DivPI;
end;
(* End Of VertexAngle *)

// calcule l'angle de 2 droites bidimensionnelles


 

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