unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DXClass, DXDraws, ComCtrls;

type
  TForm1 = class(TForm)
    DXDraw1: TDXDraw;
    TrackBar1: TTrackBar;
    procedure FormCreate(Sender: TObject);
    procedure TrackBar1Change(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  DXDraw1.Align := alClient;
  TrackBar1.Align := alBottom;
  TrackBar1.Height := 22;
  TrackBar1.ShowSelRange := False;
  TrackBar1.Max := 255;
end;

procedure TForm1.TrackBar1Change(Sender: TObject);
begin
  DXDraw1.Surface.Fill(0);
  DXDraw1.Surface.Lock;
  DXDraw1.Surface.Noise(DXDraw1.Surface.ClientRect, TrackBar1.Position);
  DXDraw1.Surface.UnLock;
  DXDraw1.Flip;
end;

end.