Часы с плавно передвигающейся минутной стрелкой

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;
 
type
  TForm1 = class(TForm)
    Timer1: TTimer;
    Button1: TButton;
  procedure DrawArrows(DrawColor: TColor);
    procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
 
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
  CenterX, CenterY, Radius: integer;
  HourArrow,MinArrow, SecArrow: Integer;
  Hour, min, sec, msec: word;
  HourAngle, MinAngle, SecAngle: real;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
begin
CenterY:= Form1.ClientHeight div 2;
CenterX:= CenterY;
Radius:=CenterX - 20;
HourArrow:=Radius - 30;
MinArrow:= Radius - 20;
SecArrow:= Radius- 10;
end;
 
procedure TForm1.FormPaint(Sender: TObject);
var i: integer;
begin
with Form1.Canvas do begin
  Pen.Color:=clBlue;
  Pen.Width:=4;
  Brush.Color:=clWhite;
  Ellipse(20,20,20 + 2 * Radius, 20 +2 * Radius);
  Pen.Width:=2;
  for i:=0 to 11 do begin
    MoveTo(CenterX+Round((Radius-9) * Sin(i / 6 *pi)),
           CenterY- Round((Radius - 9) * Cos(i / 6 *pi)));
    LineTo(CenterX+Round((Radius)*sin(i/6 *pi)),
    CenterY-Round((Radius) * cos(i / 6 *pi)));
    end;
  Font.Height:=10;
  Font.Color:=clBlack;
  Brush.Color:=Form1.Color;
  TextOut(CenterX-TextWidth('12') div 2, CenterY - Radius - TextHeight('12') - 5,'12');
  TextOut(CenterX+Radius+5, CenterY - TextHeight('3'), '3');
  TextOut(CenterX-TextWidth('6') div 2, CenterY+Radius+5, '6');
  TextOut(CenterX - Radius - TextWidth('9') -5, CenterY -TextHeight('9'), '9');
  end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
if Button1.Caption = 'Старт' then begin
  DecodeTime(Time, Hour, min, sec, msec);
  HourAngle:=(Hour mod 12) / 12 *(2*pi);
  MinAngle:=min / 60 * (2* Pi);
  SecAngle:=sec/ 60 *(2*pi);
  DrawArrows(Clred);
  Button1.Caption:='Stop';
  Timer1.Enabled:=true;
  end
  else begin
    Button1.Caption:='Старт';
    Timer1.Enabled:=false;
    end;
end;
 
procedure TForm1.Timer1Timer(Sender: TObject);
begin
DrawArrows(ClWhite);
DecodeTime(Time, Hour, min, sec, msec);
  HourAngle:=(Hour mod 12) / 12 *(2*pi);
  MinAngle:=min / 60 * (2* Pi);
  SecAngle:=sec/ 60 *(2*pi);
  DrawArrows(clRed);
end;
 
procedure TForm1.DrawArrows(DrawColor: TColor);
begin
with Form1.Canvas do begin
  Pen.Color:=DrawColor;
  MoveTo(CenterX, CenterY);
  Pen.Width:=3;
  LineTo(CenterX+ Round(HourArrow * Sin(HourAngle)),
  CenterY - Round(HourArrow*cos(HourAngle)));
  MoveTo(CenterX, CenterY);
  Pen.Width:=2;
  LineTo(CenterX + Round(MinArrow * sin(MinAngle)),
  CenterY - Round(MinArrow * Cos(MinAngle)));
  MoveTo(CenterX, CenterY);
  Pen.Width:=1;
  LineTo(CenterX+Round(SecArrow*sin(SecAngle)),
  CenterY - Round(SecArrow * Cos(SecAngle)));
  end;
end;
 
end.

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  DrawArrows(ClWhite);
  DecodeTime(Time, Hour, min, sec, msec);
  HourAngle := (Hour mod 12) / 12 *(2*pi) + (min / 3600 *(2*pi));
  MinAngle:=min / 60 * (2* Pi) + (sec / 3600 *(2*pi));
  SecAngle:=sec/ 60 *(2*pi);
  DrawArrows(clRed);
end;