Delphi 与 DirectX 之 DelphiX(86): TDIB.DrawOn();

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, DIB, StdCtrls;



type

  TForm1 = class(TForm)

    DXPaintBox1: TDXPaintBox;

    procedure FormCreate(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

    procedure DXPaintBox1MouseUp(Sender: TObject; Button: TMouseButton;

      Shift: TShiftState; X, Y: Integer);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



var

  dib: TDIB;



procedure TForm1.DXPaintBox1MouseUp(Sender: TObject; Button: TMouseButton;

  Shift: TShiftState; X, Y: Integer);

begin

  DXPaintBox1.DIB.Fill(clGray);

  dib.DrawOn(dib.ClientRect, DXPaintBox1.DIB.Canvas, -X, -Y);

  DXPaintBox1.Repaint;

end;



procedure TForm1.FormCreate(Sender: TObject);

const

  ImgPath1 = 'C:\Temp\DX.jpg';

begin

  dib := TDIB.Create;

  dib.LoadFromFile(ImgPath1);

  DXPaintBox1.Width := dib.Width;

  DXPaintBox1.Height := dib.Height;

  DXPaintBox1.DIB.SetSize(dib.Width, dib.Height, 24);

  DXPaintBox1.DIB.Fill(clGray);

end;



procedure TForm1.FormDestroy(Sender: TObject);

begin

  dib.Free;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 142

  ClientWidth = 163

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  OnDestroy = FormDestroy

  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

    OnMouseUp = DXPaintBox1MouseUp

  end

end