Re: buffer

[Alexey Botchkov]

> so here goes: does this function also do line-buffering?
Yes, it does. Point buffering should work also.

> and if so, does the buffer polygon have a curved, circle segment shape near the line's vertices?

Yep.

>are holes in polygons considered, in the way that as much as the outline contour of the polygon is moved outwards by the amount of the buffer's size, the holes' contours are moved inwards by the same value?

Right. It should work that way.

> are holes that eventually will disappear considered?

Well if the hole is covered by the 'buffer' are it's going to disappear in the result. What do You mean 'considered'?

> are negative buffer sizes supported?
Yes. The area of a resulting polygon will be smaller and holes respectively bigger.