gEDA-user: PCB polygon & rectangle practicalities

[Dave N6NZ <n6nz@xxxxxxxx>]

In fooling with various practice layouts (partial layouts, actually) I 
think I have the basics of polygons and rectangles sorted out.  Now I'm 
wondering about the practicalities is adjoining poly's.

Here is the situation: In my design, there wants to be a polygon patch 
of analog ground that will have nothing routed through it, although 
there will be a few clearance vias and thermal-relief joined vias.  This 
polygon will be on the solder side (2 sided design) and will be an 
island in what I hope will be a fairly continuous chunk of digital 
ground plane, although I'm planning the solder side as my Y-axis routing 
layer, so there will be lots of traces cleared out through it.

Anyway the point is, while the analog ground patch is easy to draw as a 
poly, the digital ground wants to be a simple rectangle with an island 
in it. I presume that the best way to make that happen is to lay down 
the AGND poly, and then draw several rectangles/poly's for GND until the 
composite is the shape I want.  So... do I need to overlap the GND 
poly's so that they will join up? Or can I just turn on the grid and 
draw to the snaps and count on "touching" to be enough to actually join 
them?  Are there some gotcha's here that I haven't thought of that I am 
going to trip over? Manufacturability issues?

-dave


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