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Article #17915: Calculating a point using angles and distance

 Question and Answer Database

FAQ2915D.txt   Calculating a point using angles and distance
Category   :Object Pascal
Platform    :All
Product    :All 32 bit  

How do I calculate the x and y coordinates of a point that is 
at some distance and angle away?

The following example shows how to convert a polar coordinate to a
rectangular coordinate:

procedure TForm1.Button1Click(Sender: TObject);
  Angle : Double;
  x : Double;
  y : Double;
  Distance : Double;
  Radians : Double;
   Distance := 100;
   Angle := 270;
   Radians := Angle * DegToRad;
   x := Round(Distance * Cos(Radians));
   y := Round(Distance * Sin(Radians));
   ShowMessage(FloatToStr(x) + ' ' + FloatToStr(y));

7/16/98 4:31:28 PM

Last Modified: 01-SEP-99