Delphi 与 DirectX 之 DelphiX(26): TDIB 的主要载体 – TDXPaintBox

TDXPaintBox 和 TPaintBox 一样拥有重要的属性 Canvas;

现在要关心的是 TDXPaintBox 另一个主要属性: DIB(TDIB 对象);
在下面学习 TDIB 时, 应该会大量用到这个 TDXPaintBox.

虽然叫它 TDXPaintBox, 但我觉得它更像 TImage, 只是把 TImage.Picture 换做了 TDXPaintBox.DIB.

在设计时可以给 TDXPaintBox 的 DIB 对象添加图片, 不过本例是运行时添加的; 运行效果图:

代码文件:

     unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    DXPaintBox1: TDXPaintBox;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  w,h:Integer;

procedure TForm1.Button1Click(Sender: TObject);
begin
  DXPaintBox1.Width := w div 2;
  DXPaintBox1.Height := w div 2;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  DXPaintBox1.Width := ClientWidth;
  DXPaintBox1.Height := ClientHeight;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  DXPaintBox1.Width := w;
  DXPaintBox1.Height := h ;
end;

procedure TForm1.FormCreate(Sender: TObject);
const
  ImgPath1 = 'C:\Temp\DX.jpg';
begin
  DXPaintBox1.Left := 0;
  DXPaintBox1.Top := 0 ;

  DXPaintBox1.DIB.LoadFromFile(ImgPath1);
  w := DXPaintBox1.DIB.Width ;
  h := DXPaintBox1.DIB.Height;
  DXPaintBox1.Width := w ;
  DXPaintBox1.Height := h ;
  DXPaintBox1.Stretch := True;
end;

end.
文件下载:

200902121524588822.rar