Convert lines to a closed polygon?

[enderw88]

I know I can convert a single line to a polygon (option on the WT polygon tool) but is there a way to convert a series of lines to a polygon? In particular i want to convert a complex series of lines to a polygon so that I can measure centroid and inertias.

Thus far I have been manually building a polygon over the existing lines.

[Peter Severin Carlsen]

You can select the lines you want to form the polygon and use the powercadd command "attach" under the "tool" menu. As long as the lines meet at their end points you will get a polygon. If you want to preserve the original lines you can always copy and paste them on a separate layer or off to the side and work on the copy there.

Of course you can also you flood the area that you want to form a polygon and you end up with a polygon. The flood tool sometimes even works with lines simply crossing, but I've found that where there are multiple cures as in an aluminum window frame extrusion, it often gets confused.

And I bet others have ways I've never discovered or thought of.

[enderw88]

Thank you. That worked well.

It even works for a different problem I was having: If you draw a closed polygon with rounded corners using lines and arcs, the centroid tool will not work. But, if you "ungroup" the polygon, select the lines and curves and "attach" them the centroid tool works perfectly.

If you draw a closed rounded polygon using "beziers" the controid tool complains that there are open shapes.

[Alfred Scott]

Centroid works fine on a rounded rectangle here. Perhaps you are confusing this with the Slot tool that will place the lines and arcs as a group (no good for Centroid) or Beziers (good for Centroid).

There's also the Join tool.

Alfred