Delphi與DirectX之DelphiX(18)：TDXDraw中描繪圖片的命令

前面的繪圖命令都是來自TDXImageList,

准確地說是來自TDXImageList.Items 所包含的TPictureCollectionItem對象.

那TDXDraw本身有沒有繪圖命令呢?

TDXDraw本身沒有繪圖命令, 但它的有繪圖表面(TDirectDrawSurface), 譬如: Surface、Primary;

TDXDraw的繪圖表面有更多的繪圖命令, 另外TDXDraw可以多個繪圖表面.

TDirectDrawSurface的繪圖命令和 TPictureCollectionItem的繪圖命令最大的區別是它們的圖像來源;

TDirectDrawSurface的圖像來源必須是另一個已繪制好的TDirectDrawSurface 對象.

這裡列舉的只是TDirectDrawSurface和TPictureCollectionItem 類似的描繪圖片的命令:
TDirectDrawSurface.Draw();
TDirectDrawSurface.StretchDraw();
TDirectDrawSurface.DrawAdd();
TDirectDrawSurface.DrawAlpha();
TDirectDrawSurface.DrawSub();
TDirectDrawSurface.DrawAddCol();
TDirectDrawSurface.DrawAlphaCol();
TDirectDrawSurface.DrawSubCol();
TDirectDrawSurface.DrawRotate();
TDirectDrawSurface.DrawRotateAdd();
TDirectDrawSurface.DrawRotateAdd();
TDirectDrawSurface.DrawRotateAlpha();
TDirectDrawSurface.DrawRotateSub();
TDirectDrawSurface.DrawRotateAddCol();
TDirectDrawSurface.DrawRotateAlphaCol();
TDirectDrawSurface.DrawRotateCol();
TDirectDrawSurface.DrawRotateSubCol();
TDirectDrawSurface.DrawWaveX();
TDirectDrawSurface.DrawWaveXAdd();
TDirectDrawSurface.DrawWaveXAlpha();
TDirectDrawSurface.DrawWaveXSub();
TDirectDrawSurface.DrawWaveY();
TDirectDrawSurface.DrawWaveYAdd();
TDirectDrawSurface.DrawWaveYAlpha();
TDirectDrawSurface.DrawWaveYSub();

本例效果圖:

代碼文件:

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DXDraws, StdCtrls;
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
PicItem: TPictureCollectionItem;
procedure TForm1.FormCreate(Sender: TObject);
const
ImgPath1 = 'C:\Temp\DelphiX.bmp';
begin
DXImageList1.DXDraw := DXDraw1;
PicItem := TPictureCollectionItem(DXImageList1.Items.Add);
PicItem.Picture.LoadFromFile(ImgPath1);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
MySurface: TDirectDrawSurface;
begin
MySurface := TDirectDrawSurface.Create(DXDraw1.DDraw);
PicItem.Restore; {Surface.Draw的矩形范圍好像能直接作用到列表中的圖片, 需要恢復一下}
MySurface.SetSize(PicItem.Width, PicItem.Height);
MySurface.Fill(0);
PicItem.Draw(MySurface, 0, 0, 0);
DXDraw1.Surface.Fill(0);
DXDraw1.Surface.Draw((DXDraw1.Width - MySurface.Width) div 2,
(DXDraw1.Height - MySurface.Height) div 2,
MySurface);
DXDraw1.Flip;
FreeAndNil(MySurface);
end;
procedure TForm1.Button2Click(Sender: TObject);
var
MySurface: TDirectDrawSurface;
m,n: Integer;
begin
m := 40; n := 15;
MySurface := TDirectDrawSurface.Create(DXDraw1.DDraw);
PicItem.Restore; {Surface.Draw的矩形范圍好像能直接作用到列表中的圖片, 需要恢復一下}
MySurface.SetSize(PicItem.Width, PicItem.Height);
MySurface.Fill(0);
PicItem.Draw(MySurface, 0, 0, 0);
DXDraw1.Surface.Fill(0);
DXDraw1.Surface.Draw((DXDraw1.Width - MySurface.Width) div 2 + m,
(DXDraw1.Height - MySurface.Height) div 2 + n,
Bounds(m, n, MySurface.Width - m*2, MySurface.Height - n*2),
MySurface);
DXDraw1.Flip;
FreeAndNil(MySurface);
end;
end.