How to get rectilinear core coordinates

If having the points associated with the polygon that surrounds the core box would be helpful, you could process the coordinates that come back from 'dbGet top.fplan.rows.box'.  For instance:

unset -nocomplain polys points
foreach rect [dbGet top.fplan.rows.box] {
  foreach {llx lly urx ury} $rect {break}
  foreach x [list $llx $urx] {
    foreach y [list $lly $ury] {
      if {! [info exists points($x,$y)]} {
        set points($x,$y) 0
      } else {
        incr points($x,$y)
      }
    }
  }
}
foreach xy [array names points] {
  if {$points($xy) == 0} {
    lappend polys [split $xy ,]
  }
}

...Now the 'polys' list contains the points corresponding to the core polygon. 

Jason

If having the points associated with the polygon that surrounds the core box would be helpful, you could process the coordinates that come back from 'dbGet top.fplan.rows.box'.  For instance:

unset -nocomplain polys points
foreach rect [dbGet top.fplan.rows.box] {
  foreach {llx lly urx ury} $rect {break}
  foreach x [list $llx $urx] {
    foreach y [list $lly $ury] {
      if {! [info exists points($x,$y)]} {
        set points($x,$y) 0
      } else {
        incr points($x,$y)
      }
    }
  }
}
foreach xy [array names points] {
  if {$points($xy) == 0} {
    lappend polys [split $xy ,]
  }
}

...Now the 'polys' list contains the points corresponding to the core polygon. 

Jason