Кривая Минковского на языке Pascal

unit Unit1;
 
{$mode objfpc}{$H+}
 
interface
 
uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls,
  Buttons;
 
type
 
  { TForm1 }
 
  TForm1 = class(TForm)
    BitBtn1: TBitBtn;
    PaintBox1: TPaintBox;
    procedure BitBtn1Click(Sender: TObject);
 
    procedure Gor(x,y: integer);
    procedure Ver(x,y: integer);
    procedure Minkovsky(x,y: integer);
 
 
  private
    { private declarations }
  public
    { public declarations }
 
    end;
 
var
  Form1: TForm1;
    var i,x1,y1,k,n:LongInt;
implementation
 
{$R *.lfm}
 
{ TForm1 }
 
  procedure TForm1.Gor(x,y: integer);  // горизонтальный отрезок
  begin
    PaintBox1.Canvas.Line(x,y,x+k div 4,y);
    PaintBox1.Canvas.Line(x+k div 4,y+k div 4,x+k div 4+k div 4,y+k div 4);
    PaintBox1.Canvas.Line(x+k div 4+k div 4,y-k div 4,x+k-k div 4,y-k div 4);
    PaintBox1.Canvas.Line(x+k-k div 4,y,x+k,y);
    PaintBox1.Canvas.Line(x+k div 4,y,x+k div 4,y+k div 4);
    PaintBox1.Canvas.Line(x+k div 4+k div 4,y+k div 4,x+k div 4+k div 4,y-k div 4);
    PaintBox1.Canvas.Line(x+k-k div 4,y-k div 4,x+k-k div 4,y);
  end;
   procedure TForm1.Ver(x,y: integer); // вертикальный отрезок
  begin
      PaintBox1.Canvas.Line(x,y,x,y+k div 4);
      PaintBox1.Canvas.Line(x, y+k div 4, x-k div 4,y+k div 4);
      PaintBox1.Canvas.Line(x-k div 4, y+k div 4, x-k div 4,y+k div 4+k div 4);
      PaintBox1.Canvas.Line(x-k div 4,y+k div 4+k div 4, x+k div 4,y+k div 4+k div 4);
      PaintBox1.Canvas.Line(x+k div 4, y+k div 4+k div 4, x+k div 4, y+k-k div 4);
      PaintBox1.Canvas.Line(x+k div 4, y+k-k div 4, x, y+k-k div 4);
      PaintBox1.Canvas.Line(x, y+k-k div 4,x,y+k);
   end;
   procedure TForm1.Minkovsky(x,y: integer); // функция построения кривой
   begin
 
       Gor(x,y);
       Ver(x+k,y);
       Gor(x+k,y+k);
       Ver(x+2*k, y-k);
       Ver(x+2*k, y1);
       Gor(x+2*k,y-k);
       Ver(x+3*k, y-k);
       Gor(x+3*k, y);
 
   end;
   procedure TForm1.BitBtn1Click(Sender: TObject);
  begin
    k:=120;
     x1:=50; y1:=200;
     Minkovsky(x1,y1);
 
  end;
end.