图片的合并与缩放 - 回复 "錢亞兵" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/12/30/1316584.html#1417644

---

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{将两个图片横向合并}
procedure TForm1.Button1Click(Sender: TObject);
var
  bit, bit1, bit2: TBitmap;
  h: Integer;
begin
  bit := TBitmap.Create;
  bit1 := TBitmap.Create;
  bit2 := TBitmap.Create;

  bit1.LoadFromFile('c:\temp\test1.bmp');
  bit2.LoadFromFile('c:\temp\test2.bmp');

  h := bit1.Height; if bit2.Height > h then h := bit2.Height;
  bit.SetSize(bit1.Width + bit2.Width, h);

  bit.Canvas.Draw(0, 0, bit1);
  bit.Canvas.Draw(bit1.Width, 0, bit2);

  bit.SaveToFile('c:\temp\test.bmp');

  bit.Free;
  bit1.Free;
  bit2.Free;
end;

{将图片缩小至 1/4}
procedure TForm1.Button2Click(Sender: TObject);
const
  r = 0.25;
var
  bit1, bit2: TBitmap;
begin
  bit1 := TBitmap.Create;
  bit2 := TBitmap.Create;

  bit1.LoadFromFile('c:\temp\test.bmp');

  bit2.SetSize(Trunc(bit1.Width * r), Trunc(bit1.Height * r));
  bit2.Canvas.StretchDraw(Rect(0,0,bit2.Width,bit2.Height), bit1);

  bit2.SaveToFile('c:\temp\test.bmp');

  bit1.Free;
  bit2.Free;
end;

end.