[Magic-dev] Viewing metal layers without seeing via cuts

[R. Timothy Edwards]

Philippe,

> Unfortunately, it would significantly alter the semantics of the "see" 
> command.  I expect (and my .magicrc file reflects this) to be able to 
> turn individual tyle types on and off via the "see" command, in 
> particular with respect to the "select visible" command I implemented 
> years ago.  For instance, I wouldn't want "see no ; see m4" to show 
> metal 4 where the vias are, because then I wouldn't be able to select 
> only the metal 4 for copy/move/stretch.

The change I implemented doesn't affect the semantics of the "see"
command except that if you do "see no *; see m4" followed by
"select visible", then you would get a selection including all metal4
but *not* m4c or m5c.  Then probably the sane thing to do is to change
the effect of "select visible" such that where m4c or m5c are present,
metal4 is copied into the select buffer.  That way, "select visible"
continues to select what is visible.  Normally, I would think that if
you do "see no *; see m4", you want to see unbroken m4 nets, and if
you then do "select visible", then you want to select unbroken m4 nets.
I expect the suggested change to "select visible" to be a bit more
involved than the one to the display routine.

						---Tim

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| Dr. R. Timothy Edwards (Tim)   | email: tim at opencircuitdesign.com    |
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