Delphi 与 DirectX 之 DelphiX(10): TPictureCollectionItem.StretchDraw - 绘制到指定矩形

本例效果图:

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代码文件:

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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

  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);

begin

  DXDraw1.Surface.Fill(0);

  PicItem.StretchDraw(DXDraw1.Surface, DXDraw1.Surface.ClientRect, 0);

  DXDraw1.Flip;

end;



procedure TForm1.Button2Click(Sender: TObject);

var

  r: TRect;

begin

  r.Left := (DXDraw1.Width - PicItem.Width) div 2;

  r.Top := (DXDraw1.Height - PicItem.Height) div 2;

  r.Right := r.Left + PicItem.Width;

  r.Bottom := r.Top + PicItem.Height;



  DXDraw1.Surface.Fill(0);

  PicItem.StretchDraw(DXDraw1.Surface, r, 0);

  DXDraw1.Flip;

end;



end.