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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi 與 DirectX 之 DelphiX(26): TDIB 的主要載體 - TDXPaintBox

Delphi 與 DirectX 之 DelphiX(26): TDIB 的主要載體 - TDXPaintBox

編輯:Delphi

 TDXPaintBox 和 TPaintBox 一樣擁有重要的屬性 Canvas;

  現在要關心的是 TDXPaintBox 另一個主要屬性: DIB(TDIB 對象);

  在下面學習 TDIB 時, 應該會大量用到這個 TDXPaintBox.

  雖然叫它 TDXPaintBox, 但我覺得它更像 TImage, 只是把 TImage.Picture 換做了 TDXPaintBox.DIB.

  在設計時可以給 TDXPaintBox 的 DIB 對象添加圖片, 不過本例是運行時添加的; 運行效果圖:

  另外, 這是本例中的圖片, 應右鍵另存到 C:TempDX.jpg :

  代碼文件:

unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, DIB, StdCtrls;
type
 TForm1 = class(TForm)
  DXPaintBox1: TDXPaintBox;
  Button1: TButton;
  Button2: TButton;
  Button3: TButton;
  procedure FormCreate(Sender: TObject);
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  procedure Button3Click(Sender: TObject);
 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:TempDX.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.

  窗體文件:

object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 165
 ClIEntWidth = 225
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 OnCreate = FormCreate
 PixelsPerInch = 96
 TextHeight = 13
 object DXPaintBox1: TDXPaintBox
  Left = 8
  Top = 8
  Width = 81
  Height = 73
  AutoStretch = False
  Center = False
  KeepASPect = False
  Stretch = False
  VIEwWidth = 0
  VIEwHeight = 0
 end
 object Button1: TButton
  Left = 23
  Top = 132
  Width = 60
  Height = 25
  Caption = 'Button1'
  TabOrder = 0
  OnClick = Button1Click
 end
 object Button2: TButton
  Left = 89
  Top = 132
  Width = 60
  Height = 25
  Caption = 'Button2'
  TabOrder = 1
  OnClick = Button2Click
 end
 object Button3: TButton
  Left = 157
  Top = 132
  Width = 60
  Height = 25
  Caption = 'Button3'
  TabOrder = 2
  OnClick = Button3Click
 end
end


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