Как реализовать задачу (Создать в Delphi приложения, соответствующие следующим описаниям)

unit Unit1;
 
interface
 
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;
 
type
  TForm1 = class(TForm)
    PaintBox1: TPaintBox;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
 
    procedure Button1Click(Sender: TObject);
    procedure PaintBox1Paint(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
  S:string;
 a,b,Counter:integer ;
 
  X1,Y1:integer;
implementation
 
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
begin
 
if PaintBox1.Top -b/2<= (PaintBox1.Height-b)/2+Counter then
begin
S:='Test';
Counter:=Counter-1;
end
else
begin
S:='STOP';
end;
PaintBox1.Repaint;
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
if PaintBox1.Height-PaintBox1.Top-b/2  >= (PaintBox1.Height-b)/2+Counter then
begin
S:='Test';
Counter:=Counter+1;
end
else
begin
S:='STOP';
end;
PaintBox1.Repaint;
end;
 
procedure TForm1.Button3Click(Sender: TObject);
begin
 Form1.close;
end;
 
procedure TForm1.FormCreate(Sender: TObject);
begin
Counter:=0; //
S:='Test';
end;
 
procedure TForm1.PaintBox1Paint(Sender: TObject);
begin
 X1:= Round((PaintBox1.Width-a)/2);
 Y1:=Round((PaintBox1.Height-b)/2);
With PaintBox1.canvas do
begin
Rectangle(10,10,PaintBox1.Width-10,PaintBox1.Height-10) ;
if True then
if S='Test' then Font.Color:=ClBlue;
if S='STOP'then Font.Color:=clRed;
 
Font.size:=12;
a:=TextWidth(S) ;
b:=TextHeight(S);
TextOut(Round((PaintBox1.Width-a)/2),Round((PaintBox1.Height-b)/2)+Counter,S);
end;
end;
 
 
 
end.