本例效果圖:
代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DXDraws, StdCtrls, DXClass;
type
TForm1 = class(TForm)
DXDraw1: TDXDraw;
DXImageList1: TDXImageList;
Button1: TButton;
Button2: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var
pic1,pic2: TPictureCollectionItem;
procedure TForm1.FormCreate(Sender: TObject);
const
ImgPath1 = 'C:TempBack.jpg';
ImgPath2 = 'C:TempDelphiX.bmp';
begin
DXImageList1.DXDraw := DXDraw1;
pic1 := TPictureCollectionItem(DXImageList1.Items.Add);
pic1.Picture.LoadFromFile(ImgPath1);
pic2 := TPictureCollectionItem(DXImageList1.Items.Add);
pic2.Picture.LoadFromFile(ImgPath2);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
r: TRect;
begin
r := Bounds((DXDraw1.Width - pic2.Width) div 2,
(DXDraw1.Height - pic2.Height),
pic2.Width,
pic2.Height);
DXDraw1.Surface.Fill(0);
pic1.StretchDraw(DXDraw1.Surface, DXDraw1.ClIEntRect, 0);
pic2.DrawAdd(DXDraw1.Surface, r, 0);
DXDraw1.Flip;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
r: TRect;
begin
r := Bounds((DXDraw1.Width - pic2.Width) div 2,
(DXDraw1.Height - pic2.Height),
pic2.Width,
pic2.Height);
DXDraw1.Surface.Fill(0);
pic1.StretchDraw(DXDraw1.Surface, DXDraw1.ClIEntRect, 0);
pic2.DrawSub(DXDraw1.Surface, r, 0);
DXDraw1.Flip;
end;
end.
