Polyline snapping

[TiTaNiuM sAMuRai]

Rounded rectangles now snap (per Object constraint) to the ends of the arcs / beziers that make up the rounded corners, instead of the theoretical _corners_.Along the same line, there is an odd and inconsistent behavior from snapping to a 'composed' polygon comprised of an arc in between -- and tangent to -- two lines. Whereas the reshape command shows a theoretical corner, and I can draw out that handle as though it was an arc, and the object snapping identifies 'arc' at the arc ends, BUT it also indicates 'centre' at the (get this):midpoints of theoretical lines which would define the curve of a bezier, exactly what happens when you Add Surface with an arc (i.e. the arc turns into a couple of beziers).

Why the half-half behavior? Why doesn't Compose turn an arc into an arc vertex? Does this have to do with tangency?

[Matthew Giampapa]

Compose does turn arcs into arc vertices of polylines.

Rounded rectangles are a special case because they can have all kind's or different aspect ratios for the curves. If it is a symmetrical ratio... then VectorWorks should be treating them as arc's when you convert them to polylines, otherwise it's a series of polylines.

Just play with various rounded rectangles and the decompose command to see what each is made of.

Your right about the change from 8->9 and the corner snaps. I'll check to see if this is going to be called a regression bug or a design change. My guess is it's a design change.

Matthew GiampapaNNA Technical Support

[TiTaNiuM sAMuRai]

"object snapping identifies 'arc' at the arc ends, BUT it also indicates 'centre' at the (get this):midpoints of theoretical lines which would define the curve of a bezier, exactly what happens when you Add Surface with an arc (i.e. the arc turns into a couple of beziers)"

I agree that it's likely a design change, yet I'm not complaining about IT, per se (there are ups and down to both 'arc vertex' and 'corner vertex-but-rounded-sorta'). I just want to know why it says 'Centre' where it does. THAT item doesn't appear to be deliberate...

[Matthew Giampapa]

The corner snapping is not a design change, it's a regression bug. Probably too late at this point but that is what maintenance release are for.

The center prompt is being caused by a separate bug with Bezier vertices in polylines. That was introduced when we changed how snapping works inside symbols.

Basically, a rounded rectangle corner is broken up into 3 Bezier polylines, at the last vertice of the polyline you get a center prompt instead of a point prompt.

In investigating this, we also discovered a new bug with the decompose command in the development version.

Let me know if you have further questions,Matthew GiampapaNNA Technical Support