by apjjr » Mon Jan 19, 2009 9:53 pm
Thanks, Andrew. I see what is going on, now. The angle is not relative to my start point. I started with a line going from lower left to upper right. I wanted an arc with a center 1235 to the upper left of that line. I understand now that the resulting arc is relative to QCAD's zero line, not the angle from the end of my starting line to the center of the arc. So, to get my angle, I subtract 90 from the angle of the line back to zero and subtract the angle of arc I want from that. I tried that and it worked. Whew! And that'll depend on which quadrant I'm in, too. This is for drawing land platts for real estate. I can make it work, but its a little awkward at this point. The information I start with is the length of the required arc, the radius and a line with which to be tangent. I calculate the angle for QCAD. I entered '@1230<-49.59' to get my 1 deg of arc. My starting line was at -140.59 deg. That would be 140.59-90-1=49.59.
- Alex