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...Perpendicular from Point to Segment in 2D?
Autor: Arash Partow
Homepage: http://www.partow.net
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Tip Rating (11):  
     


procedure PerpendicularPntToSegment(x1, y1, x2, y2, Px, Py: Double; var Nx, Ny: Double);
var 
  
R: Double;
  Dx: Double;
  Dy: Double;
begin
  
Dx := x2 - x1;
  Dy := y2 - y1;
  R  := ((Px - x1) * Dx + (Py - y1) * Dy) / Sqr(Dx * Dx + Dy * Dy);
  Nx := x1 + R * Dx;
  Ny := y1 + R * Dy;
end;
(* End PerpendicularPntSegment *)

// trouve la perpendiculaire entre un point et une droite (2D)


 

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