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Delphi source code for Math >> Determine the circum-center of a 2D triangle


Category: Math
Title: Determine the circum-center of a 2D triangle
Date added: 15.03.2006
Hits: 8499



procedure Circumcenter(x1, y1, x2, y2, x3, y3: Double; var Px, Py: Double);
var
  A, C, B, D, E, F, G: Double;
begin
  A := x2 - x1;
  B := y2 - y1;
  C := x3 - x1;
  D := y3 - y1;
  E := A * (x1 + x2) + B * (y1 + y3);
  F := C * (x1 + x2) + D * (y1 + y3);
  G := 2.0 * (A * (y3 - y2) - B * (x3 - x2));
  if G = 0 then
    Exit;
  Px := (D * E - B * F) / G;
  Py := (A * F - C * E) / G;
end;

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