再學GDI+[10]: DrawClosedCurve - 繪制閉合曲線(2)

窗體文件:object Form1: TForm1
　Left = 0
　Top = 0
　Caption = 'Form1'
　ClIEntHeight = 188
　ClIEntWidth = 264
　Color = clBtnFace
　Font.Charset = DEFAULT_CHARSET
　Font.Color = clWindowText
　Font.Height = -11
　Font.Name = 'Tahoma'
　Font.Style = []
　OldCreateOrder = False
　Position = poDesktopCenter
　OnCreate = FormCreate
　OnMouseUp = FormMouseUp
　OnPaint = FormPaint
　PixelsPerInch = 96
　TextHeight = 13
　object Button1: TButton
　　Left = 181
　　Top = 155
　　Width = 75
　　Height = 25
　　Caption = 'Button1'
　　TabOrder = 0
　　OnClick = Button1Click
　end
　object TrackBar1: TTrackBar
　　Left = 8
　　Top = 155
　　Width = 167
　　Height = 25
　　TabOrder = 1
　　OnChange = TrackBar1Change
　end
end