用插补的方法把"B样条曲线"进行插补输出到雕刻机进行刻绘?

clh2321890

小弟在做AutoCAD的图形输出。
我现在需要用插补的方法把"B样条曲线"进行插补输出到雕刻机进行刻绘。现在遇到困难。
我的算法如下：
Dim n As Integer '样条曲线控制点数
Dim u(5), v(5) As Double 'x,y坐标

Private Sub Command3_Click()
Picture1.Scale (0, 0)-(800, 600)
u(0) = 57: v(0) = Picture1.ScaleHeight - 83
u(1) = 190: v(1) = Picture1.ScaleHeight - 442
u(2) = 259: v(2) = Picture1.ScaleHeight - 5
u(3) = 461: v(3) = Picture1.ScaleHeight - 505
u(4) = 449: v(4) = Picture1.ScaleHeight - 123
n = 5

b_spLine n

End Sub

Private Sub b_spLine(n As Integer)
Dim i, j, k As Integer
Dim b(4, 10), x(10), y(10) As Double
num = 10
For i = 1 To 10
t = i / num
b(0, i) = (1 - t) * (1 - t) * (1 - t) / 6
b(1, i) = (t - 2) * t * t / 2 + 2 / 3
b(2, i) = (1 + t - t * t) * t / 2 + 1 / 6
b(3, i) = t * t * t / 6
Next i
For i = 1 To n
x(i) = u(i - 1): y(i) = v(i - 1)
Next i

x(0) = 2 * x(1) - x(2): y(0) = 2 * y(1) - y(2)
x(n + 1) = 2 * x(n) - x(n - 1): y(n + 1) = 2 * y(n) - y(n - 1)
Picture1.PSet (x(1), y(1))
For i = 0 To n - 2
For j = 1 To 10
xe = 0: ye = 0
For k = 0 To 3
xe = xe + b(k, j) * x(i + k): ye = ye + b(k, j) * y(i + k)
Next k
Picture1.Line -(xe, ye)
Next j
Next i
End Sub

该算法是利用AUTOCAD的DXF文件中的控制点数据进行插补的，可是画出的图形与AUTOCAD中的图形不完全相同。望有经验的帮帮我，万分着急！

rusher

Dim u(5), v(5) As Double 'x,y坐标
vb里这样定义好象是有问题的吧？