This is a very interesting idea, but I don't know what it is called and am fairly certain that Inkscape does not currently support it. The problem is that there will be some ambiguity as to how to impose these constraints. For example if you have a line segment with 5 points ABCDE, and you start pulling on A to make the line longer. Initially you will be able to deal with this just by adjusting B alone. But at some point ABC will be a straight line, so you will now have to adjust C as well. So now there is ambiguity, should you adjust C on the assumption that ABC remains straight, Or should you adjust both B and C simultaneously to deal with the change in A? And what happens when the entire line ABCDE is completely straight? Should all stretching movement now be forbidden or should the entire line move as a straight line? And when you start to compress the straight line length by moving A inwards, should you adjust only B, or should you perhaps move all the points equally to introduce curvature to the whole line? Anyways, I would be very interested to see if anyone has ever tackled this problem.
Alvin Penner
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