問題來源:
http://www.cnblogs.com/del/archive/2009/01/30/1381263.html#1439476
這個(gè)例子是把一張圖片平均分成了 4 份, 順序是: 左、右、上、下; 沒使用循環(huán)操作, 顯得有點(diǎn)笨, 但容易理解.
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'; {先準(zhǔn)備好測(cè)試圖片}
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.
