Re: gEDA-user: PCB format wishlist

[DJ Delorie <dj@xxxxxxxxxxx>]

> Why arc and circle are not merged? Because the diameter of the arc
> is the center of the bent line; however, the diameter of a circle is
> the edge.

I.e. you're listing a *stroked* arc vs a *filled* circle?

I like the idea of using geometric shapes at the lowest level, but for
most PCBs this is *way* too low-level to be efficient.  We need some
way of arbitrarily grouping shapes, grouping groups, etc, and creating
some sort of macro/library/callout for those groups, so that we don't
end up (for example) redefining a pad stack for every one of hundreds
of pins.

If our PCB file format had the concept of a "grouping function" that
could define named macros that took named parameters, with some simple
math and control logic, we could then use those macros to define new
primitives.  So a function that defined a standard pad stack for a pin
could be later called with a few simple parameters for each needed
pin.

This same grouping function becomes our element library :-)


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