Delphi與DirectX之DelphiX(93): TDIB.DrawDarken();(2)

窗體文件:

object Form1: TForm1
　 Left = 0
　 Top = 0
　 Caption = 'Form1'
　 ClIEntHeight = 204
　 ClIEntWidth = 254
　 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
　 end
　 object Button1: TButton
　　 Left = 8
　　 Top = 174
　　 Width = 60
　　 Height = 25
　　 Caption = 'Button1'
　　 TabOrder = 0
　　 OnClick = Button1Click
　 end
　 object Button2: TButton
　　 Left = 121
　　 Top = 174
　　 Width = 60
　　 Height = 25
　　 Caption = 'Button2'
　　 TabOrder = 1
　　 OnClick = Button2Click
　 end
　 object Button3: TButton
　　 Left = 187
　　 Top = 174
　　 Width = 60
　　 Height = 25
　　 Caption = 'Button3'
　　 TabOrder = 2
　　 OnClick = Button3Click
　 end
　 object ColorDialog1: TColorDialog
　　 Left = 208
　　 Top = 136
　 end
end