unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, StdCtrls;
type
TForm1 = class(TForm)
Timer1: TTimer;
StartB: TButton;
StopB: TButton;
PaintBox1: TPaintBox;
procedure FormCreate(Sender: TObject);
procedure StartBClick(Sender: TObject);
procedure StopBClick(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
y,x:integer;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
y:=0;
end;
procedure TForm1.StartBClick(Sender: TObject);
begin
Timer1.Enabled:=True;
end;
procedure TForm1.StopBClick(Sender: TObject);
begin
Timer1.Enabled:=False
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
if y=0 then x:=random (PaintBox1.Width);
if ((PaintBox1.Canvas.Pixels[x,y+1]=clWhite) or (y = PaintBox1.Height))
then
begin
PaintBox1.Canvas.Pixels[x,y]:=clWhite;
y:=0;
end
else
begin
PaintBox1.Canvas.Pixels[x,y]:=clHighlight;
y:=y+1;
PaintBox1.Canvas.Pixels[x,y]:=clWhite;
end;
end;
end.
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