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

本例效果圖:

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;
　　 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.

窗體文件:

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