Fusion
Four lines, length constrained to be equal to a projected line.
All lines, vertices etc are black.
Sketch icon also confirms the fully constrained state:
Yet it is still possible to drag the vertices:
Workaround:
- Delete the equality constraint with the projected line,
- Define driven dimension on the projected line,
- Apply driving dimension to one of the new lines,
- Use the driven dimension to drive the driving dimension.
This does not invalidate the bug.
The lines are shown fully constrained, but obviously they are not. That is the actual bug!
Mr. @TrippyLighting, you are underestimating me! 😉
But you are right that there also are multiple other bugs wrt geometry being shown (or not shown) as fully constrained if it shouldn't, or wrt not being able to drag even if it's underconstrained, etc... I think the sketcher must have a very messy implementation wrt constraints solving.
Anyway, in this particular case each line has its equality constraint, so each length should be defined:
The endpoints of the lines are coincident to the circles, and the projected sketch is also fully constrained:
Furthermore, refer to the workaround I posted: if you delete one equality constraint and replace it with an equality relation between dimensions, then suddenly it works correctly.
Regards,
Johan
Having a chain of constraints depending on a previous equal constraint has always tended to lead to problems. If you make all the lines equal to the projected line it works correctly.
Like this you can't drag the endpoint.
Even making only 2 lines equal to the projected line work as the chain of constrains is shorter.
Mark Hughes
Owner, Hughes Tooling
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Ahh, thanks for the explanatory highlighting. I did not dig that deep into it.
I'd have a rather esoteric feature request. Color cycling for constraint pairs!
