Deutsche Edition 1/Deutsche Edition 1.iso/amok/071-080/amok75/oberon3.0/o3demo2.lzh/Beispiele/Turtle.mod

Text File | 1992-08-22 | 533b | 30 lines

MODULE Turtle;

IMPORT D := Display, Dos;

VAR w: D.WindowPtr;

  PROCEDURE Draw(s: REAL);
  BEGIN
    IF s>2 THEN
      D.TurnLeft (w,36.9); Draw(s*0.8);
      D.TurnRight(w,90  ); Draw(s*0.6);
      D.TurnLeft (w,53.1);
    ELSE
      D.Forward(w,s);
    END;
  END Draw;

BEGIN
  NEW(w);
  IF D.OpenWindow(w,"Turtle-Grafik",0,0,512,256,NIL) THEN
    D.SetTurtlePos(w,w.width/4,w.height/4*3);
    D.SetTurtleDir(w,-90);
    D.Jam1(w);
    D.FrontPen(w,1);
    D.SetPen(w);
    Draw(w.width/3);
  END;
  Dos.Delay(200);
END Turtle.