uses GraphABC; 
const
  Angle = -Pi / 4;

procedure RLine(x, y, x1, y1: real) := Line(Round(x), Round(y), Round(x1), Round(y1)); 

procedure Draw(x, y, l: real; iterations: integer);
begin
  var lx := x + l * Cos(Angle);
  var ly := y + l * Sin(Angle);
  
  var angle1 := -Pi / 2 + Angle;
  var rx := x + l * Cos(angle1);
  var ry := y + l * Sin(angle1);
  
  RLine(x, y, lx, ly); 
  RLine(x, y, rx, ry);
  
  if iterations > 0 then 
  begin
    Dec(iterations);
    l := l / 2; 
    Draw(lx, ly, l, iterations); 
    Draw(rx, ry, l, iterations); 
  end; 
end;

begin
  LockDrawing();
  Draw(300, 300, 200, 7);
  Redraw();
end.