Delphi 与 DirectX 之 DelphiX(18): TDXDraw 中描绘图片的命令

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所属分类:[开发技巧]

前面的绘图命令都是来自 TDXImageList,
准确地说是来自 TDXImageList.Items 所包含的 TPictureCollectionItem 对象.

那 TDXDraw 本身有没有绘图命令呢?
TDXDraw 本身没有绘图命令, 但它的有绘图表面(TDirectDrawSurface), 譬如: Surface、Primary;
TDXDraw 的绘图表面有更多的绘图命令, 另外 TDXDraw 可以多个绘图表面.

TDirectDrawSurface 的绘图命令和 TPictureCollectionItem 的绘图命令最大的区别是它们的图像来源;
TDirectDrawSurface 的图像来源必须是另一个已绘制好的 TDirectDrawSurface 对象.

 

这里列举的只是 TDirectDrawSurface 和 TPictureCollectionItem 类似的描绘图片的命令:


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();

 

文件代码:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    DXDraw1: TDXDraw;
    Button1: TButton;
    Button2: TButton;
    DXImageList1: TDXImageList;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
var
  PicItem: TPictureCollectionItem;

procedure TForm1.Button1Click(Sender: TObject);
var
  MySurface: TDirectDrawSurface;
begin
  MySurface := TDirectDrawSurface.Create(DXDraw1.DDraw);     {Surface.Draw 的矩形范围好像能直接作用到列表中的图片, 需要恢复一下}
  PicItem.Restore;
  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;
  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;

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;

end.

文件下载:

 

200902101443428726.rar

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