unit1.pas

《Delphi百例》源码?禗elphi百例》源码

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Image1: TImage;
    Button1: TButton;
    ProgressBar1: TProgressBar;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  NewBitmap:tbitmap;
  i,j:integer;
  kl:longint;
  rr,gg,bb:byte;
  res:byte;
begin
  NewBitmap:=tbitmap.create;
  NewBitmap.Width:=image1.Width;
  NewBitmap.height:=image1.height;
  ProgressBar1.Max:=image1.Width+1;
  for i:=0 to image1.Width+1 do
  begin
    for j:=0 to image1.height+1 do
    begin
      kl:=ColorToRGB(image1.Canvas.Pixels[i,j]);
      rr:=byte(kl);
      gg:=byte(kl shr 8);
      bb:=byte(kl shr 8);
      res:=(rr+gg+bb) div 3;
      NewBitmap.Canvas.Pixels[i,j]:=rgb(res,res,res);
    end;
    ProgressBar1.Position:=i;
  end;//for do
  Image1.Canvas.Draw(0,0,NewBitmap);
  NewBitmap.free;
end; 

end.