分割图片的例子 回复 "小熊宝" 的问题

问题来源: http://www.cnblogs.com/del/archive/2009/01/30/1381263.html#1439476

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这个例子是把一张图片平均分成了 4 份, 顺序是: 左、右、上、下; 没使用循环操作, 显得有点笨, 但容易理解.

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
const
  path = 'c:\temp\test.bmp'; {先准备好测试图片}
var
  bit: TBitmap;
  bits: array[0..3] of TBitmap; {假如分成 4 份}
  i,w,h: Integer;
begin
  bit := TBitmap.Create;
  bit.LoadFromFile(path);
  w := bit.Width div 2;
  h := bit.Height div 2;

  for i := 0 to 3 do
  begin
    bits[i] := TBitmap.Create;
    bits[i].SetSize(w, h);
  end;

  BitBlt(bits[0].Canvas.Handle, 0, 0, w, h, bit.Canvas.Handle, 0, 0, SRCCOPY);
  BitBlt(bits[1].Canvas.Handle, 0, 0, w, h, bit.Canvas.Handle, w, 0, SRCCOPY);
  BitBlt(bits[2].Canvas.Handle, 0, 0, w, h, bit.Canvas.Handle, 0, h, SRCCOPY);
  BitBlt(bits[3].Canvas.Handle, 0, 0, w, h, bit.Canvas.Handle, w, h, SRCCOPY);

  for i := 0 to 3 do
  begin
    bits[i].SaveToFile(ChangeFileExt(path, Format('.%.3d.bmp', [i+1])));
    bits[i].Free;
  end;

  bit.Free;
end;

end.