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unit Punktemaler;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls, Buttons;

type
  TForm1 = class(TForm)
    PaintBox1: TPaintBox;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    BitBtn3: TBitBtn;
    procedure PaintBox1Paint(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

function: random;

var
  Form1: TForm1;
  xm, ym: integer;

const
  r=10;

implementation

{$R *.dfm}

procedure TForm1.PaintBox1Paint(Sender: TObject);
begin
  with paintbox1 do
  begin
    canvas.pen.Color:=clblack;
    canvas.Brush.Color:=clwhite;
    canvas.Rectangle(0,0,300,300);
  end;
  with paintbox1.Canvas do
  begin
    ellipse(xm-r,ym-r,xm+r,ym+r);
    pen.Color:=clblue;
    brush.Color:=clblue;
  end;

end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
  close;
end;

end.					

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randomize;
Punkt1:=random(Formname.Height);
Punkt2:=random(Formname.Width);					

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  begin
    randomize;  
    xm:=random(Form1.Height);
    ym:=random(Form1.Width);
    ellipse(xm-r,ym-r,xm+r,ym+r);
    pen.Color:=clblue;
    brush.Color:=clblue;
  end;