为何运行结果不是直线与圆弧相切
过三点 cp1 、cp2、 cp3作曲线，其中cp1 、cp2段为直线，cp2 、cp3段为圆弧，且圆弧与直线相切，有以下程序段：sub test()
Dim cp1(1), cp2(1), cp3(1) As Double
Dim ang1 As Double, ang2 As Double, ang As Double
Dim cp(5) As Double
cp1(0) = pnts1(0): cp1(1) = pnts1(1)
cp2(0) = pnts(0): cp2(1) = pnts(1)
cp3(0) = mc(0) + d / 2 + m + r: cp3(1) = mc(1) + r * (1 - Cos(r0))
cp(0) = cp1(0): cp(1) = cp1(1)
cp(2) = cp2(0): cp(3) = cp2(1)
cp(4) = cp3(0): cp(5) = cp3(1)
ang1 = ThisDrawing.Utility.AngleFromXAxis(cp1, cp2)
ang2 = ThisDrawing.Utility.AngleFromXAxis(cp2, cp3)
ang = ang2 - ang1
Dim pl As AcadLWPolyline
Set pl = ThisDrawing.ModelSpace.AddLightWeightPolyline(cp)
pl.SetBulge 1, Tan(ang / 2)
end sub
程序段中， mc(0) 、 d 、m 、r、 mc(1) 、r0、pnts1(0）、pnts1(1)
pnts(0)、pnts(1)值已给出。为何运行结果不是直线与圆弧相切，而仅是直线段？
请大家帮忙看看！！ 凸度的概念有错吧，它是弓高与半弦长的比值。 伊凡老师，凸度没错阿！我检查过了，可就是结果不正确，到底怎末回事呀？？ 你看看3楼的链接
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