thank you, this is useful to me, but now my problem is that i have some
AcDbArc entities in my drawing,
and they should joint each other at their end points, with some problem,
they did not, so my task is to write
a program to have them joint. With AcDbLine element it is a simple task, i
just need to call the APIs like
AcDbLine::setStartPoint() or AcDbLine::setEndPoint(), but with AcDbArc,
i don't know how to do.
If i use three point (start, middle, end) of the Arc to get its radius,
center, start angle and end angle, then set
these to the arc, i am worry about that after doing this, the end points
will not equall to the end points before
exactly, i use these arcs to do polygon topology so it is important to me to
have these arcs joint each other,
how should i do?