[Pcb-bugs] [Bug 699248] Re: Rat line calculations miss some lines

[Andrew P. <69...@bu...>]

The problem is that when calculating rat lines, pcb completely ignores
non-manhattan lines. See rats.c line 485:

 480       /* now add other possible attachment points to the subnet */
 481       /* e.g. line end-points and vias */
 482       /* don't add non-manhattan lines, the auto-router can't route to them */
 483       ALLLINE_LOOP (PCB->Data);
 484       {
 485         if (TEST_FLAG (DRCFLAG, line)
 486             && ((line->Point1.X == line->Point2.X)
 487                 || (line->Point1.Y == line->Point2.Y)))

Removing the check for manhattan lines fixes this bug, but it makes the
autorouter segfault. It is not clear to me how to proceed, but there is
probably no simple solution.

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https://bugs.launchpad.net/bugs/699248

Title:
  Rat line calculations miss some lines

Status in PCB: Printed Circuit Board CAD package:
  Confirmed

Bug description:
  This bug has popped up quite frequently during the past years, but
  I've never reported it.

  Many times I notice the rat line optimizer sometimes "misses" the last
  line in a chain of lines, and draws the rat line to the next line (see
  attached file, where one of the rat lines isn't drawn to the last line
  in the sequence.

  After digging a bit into the code, it looks like the last line in the
  chain doesn't pass the:

  TEST_FLAG (DRCFLAG, line)

  test in rats.c:492, and thus it is never added to the subnet.  I'm
  assuming this error is actually traced back to when the line is first
  drawn (?).  Regardless, I don't have the experience with the PCB code
  to trace this problem any further...hopefully someone smarter than me
  can figure out why some lines are doing this.  I can't find a
  reproducable method of drawing a line that shows this bug...but
  drawing a line with the "45 degree forcing" on (and clicking on a
  point that actually makes two lines) seems to make the bug show up
  more often then not.

  Cheers--

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