unit1.pas

来自「《深入Delphi的多媒体编程》实例源代码」· PAS 代码 · 共 51 行

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Image1: TImage;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
   procedure DivideCanvas(formBegX,ImageBaseX,HalfImageWidth:Integer);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
procedure TForm1.DivideCanvas(formBegX,ImageBaseX,HalfImageWidth:Integer);
var x,y:integer;
begin
 for x:=0 to HalfImageWidth-1 do
 begin
   for y:=0 to Image1.Height-1 do
   begin
     Canvas.Pixels[formBegX+x,y]:=Image1.Canvas.Pixels[ImageBaseX+x,y];
   end;
 end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
 HalfImageWidth:Integer;
begin
 HalfImageWidth:=Image1.Width div 2;
 DivideCanvas(0,0,HalfImageWidth);
 {复制图像的左半部分}
 DivideCanvas(HalfImageWidth+50,HalfImageWidth,HalfImageWidth);
{复制图像的右半部分}
end;

end.