Delphi与DirectX之DelphiX(11)

本例效果图:

代码文件:

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:\Temp\Back.jpg';
　ImgPath2 = 'C:\Temp\DelphiX.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.