'Points格式：
'Points（0）：X
'Points（1）：Y
'Points（2）：H
'...公式：Area=1/2*(x1*y2-x2*y1+x2*y3-x3*y2+... ...+xn*x1-x1*yn)
Private Function Area(Points() As Double) As Double      '计算Points()区域面积
    Dim L As Long
    L = UBound(Points) - 3
    Dim T1 As Long
    Dim S As Double
    S = 0
    For T1 = 0 To L Step 3
        S = S + Points(T1) * Points(T1 + 4) - Points(T1 + 1) * Points(T1 + 3)
    Next T1
    S = S + Points(T1) * Points(1) - Points(T1 + 1) * Points(0)
    Area = Abs(S / 2)
End Function