I made some small changes in the tension algorithm, so the spline is not quite as ‘tight’ as in earlier previews. The following screenshot illustrates a tension setting of 0.3 (which seems to be a good starting point).
An autoClose parameter was also added. If true, then an additional knot is added to the spline to create a closed shape. There is no attempt to match tangents at the join between the first and last knots. This allows for the creation of shapes that are different from a closed cubic Bezier spline. The following screenshot shows my pathetic attempt at something resembling a teardrop shape (I’m sure a real designer could do much better).
One or two more tests and the demo (and code) should be released in a day or two, although I’ll probably make one more change to the tension algorithm.
The Algorithmist 