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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi 與 DirectX 之 DelphiX(12): TPictureCollectionItem.DrawAlpha

Delphi 與 DirectX 之 DelphiX(12): TPictureCollectionItem.DrawAlpha

編輯:Delphi

 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, ComCtrls;
type
 TForm1 = class(TForm)
  DXDraw1: TDXDraw;
  DXImageList1: TDXImageList;
  TrackBar1: TTrackBar;
  procedure FormCreate(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
var
 PicItem: TPictureCollectionItem;
procedure TForm1.FormCreate(Sender: TObject);
const
 ImgPath1 = 'C:TempDelphiX.bmp';
begin
 DXImageList1.DXDraw := DXDraw1;
 PicItem := TPictureCollectionItem(DXImageList1.Items.Add);
 PicItem.Picture.LoadFromFile(ImgPath1);
 TrackBar1.Max := 255;
 TrackBar1.Min := 0;
 TrackBar1.Height := 22;
 TrackBar1.ShowSelRange := False;
 TrackBar1.Align := alBottom;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
var
 r: TRect;
begin
 r := Bounds((DXDraw1.Width - PicItem.Width) div 2,
       (DXDraw1.Height - PicItem.Height) div 2,
        PicItem.Width,
        PicItem.Height);
 DXDraw1.Surface.Fill(0);
 PicItem.DrawAlpha(DXDraw1.Surface, r, 0, TrackBar1.Position);
 DXDraw1.Flip;
end;
end.


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