[Pcb-bugs] [Bug 1013358] [NEW] Auto-enforce-DRC : cannot draw with exact clearance

[Sirichai P. <sir...@hi...>]

Public bug reported:

[Problem]
I'm using pcb-gtk on Ubuntu 12.04. For example, I set global clearance to 10 mil, set grid size to 10 mil and draw the first 10 mil line somewhere on PCB. When Auto-enforce-DRC is turned on, I could not draw a second line 20 mil away from the first line. 

[Further details]
However when I tried to draw a second line >20 mil away from the first line and using the enabled Auto-enforce-DRC to draw a 45-degree line to the first line and continue the second line on parallel with the first line ( \_ ), the parallel line could be placed on exact 20-mil away from the first line.  

Then if I try to draw the third line over the second line (snap to the
center of the second line), I can successfully draw the third line on
exact 20-mil away from the first line (still could not on the other side
of the first line). However If I save file.pcb and close the program and
reopen the file again, I could not draw the third line over the second
line (snap to the center of the second line).

I routed half of my PCB using Auto-enforce-DRC enabled. After I closed
and reopened file.pcb again on the next day, DRC reports clearance error
on lines with exact 10 mil spaced. Also It is very difficult to modify
those lines (on dense PCB).

Thank you very much

** Affects: pcb
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1013358

Title:
  Auto-enforce-DRC : cannot draw with exact clearance

Status in PCB: Printed Circuit Board CAD package:
  New

Bug description:
  [Problem]
  I'm using pcb-gtk on Ubuntu 12.04. For example, I set global clearance to 10 mil, set grid size to 10 mil and draw the first 10 mil line somewhere on PCB. When Auto-enforce-DRC is turned on, I could not draw a second line 20 mil away from the first line. 

  [Further details]
  However when I tried to draw a second line >20 mil away from the first line and using the enabled Auto-enforce-DRC to draw a 45-degree line to the first line and continue the second line on parallel with the first line ( \_ ), the parallel line could be placed on exact 20-mil away from the first line.  

  Then if I try to draw the third line over the second line (snap to the
  center of the second line), I can successfully draw the third line on
  exact 20-mil away from the first line (still could not on the other
  side of the first line). However If I save file.pcb and close the
  program and reopen the file again, I could not draw the third line
  over the second line (snap to the center of the second line).

  I routed half of my PCB using Auto-enforce-DRC enabled. After I closed
  and reopened file.pcb again on the next day, DRC reports clearance
  error on lines with exact 10 mil spaced. Also It is very difficult to
  modify those lines (on dense PCB).

  Thank you very much

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