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Date: Mon, 19 Dec 2011 10:15:09 -0800
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Useful things (in gschem)
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On Sun, 18 Dec 2011 09:01:45 -0700
John Doty <jpd AT noqsi DOT com> wrote:

> 
> On Dec 18, 2011, at 6:23 AM, Karl Hammar wrote:
> 
> >> 
> >> If you do mean letting gschem auto-draw the nets, I'd say that
> >> if a net is too complicated to draw manually, it's probably
> >> better to use the aforementioned net-labelling symbols anyway.
> > 
> > Why do people use auto-routers...
> 
> They use auto-routers for boards because board layout only needs
> to make electrical sense, not visual sense.

Also consider how much more complex it is to route a PCB than
to draw lines on a schematic!

For instance, the length of your schematic lines is irrelevant and
crossings of lines is free; on the other hand, PCB traces cannot
cross without introducing vias, each of which may have a negative
electrical impact, consumes board space, and obstructs routing on
other layers at that point.

On schematics, you can “warp” from one place to another using named
nets (pin/port symbols) and power/ground symbols; we can only wish
for that on a PCB.

Any help from a computer tool to design a *good* PCB layout would
certainly be a benefit, but it's unlikely a schematic capture tool
can really make a *good* (i.e., easy to read) schematic.

Regards,
Colin