Curve through points - can the points be locked?

 From:  mikerogers74
3520.1 
Hi All,

I've attached a simple image which I hope illustrates what I'd like to achieve. I want to draw a curve which passes through a series of points. In the attached pic, the tips of the triangles serve as these points. What I'd like to do is manipulate the control points to change the shape of the curve but still ensure that the curve passes through the 4 points. Is this possible in any way?

Thanks

Mike
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