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

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所属分类:[开发技巧]

本例效果图:

代码文件:

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);
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;

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.
 

10图片绘制到指定矩形.rar

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