For those on Macintosh, I highly recommend OmniGraffle, which is a
general-purpose "boxes and lines" drawing program.
The lines "rubber band" as you move entities, and it maintains "not connected"
arcs if you have lines paramaterized for that.
Here's an example, not electronic, but a schematic for Veggie Van Gogh's
vegetable oil fuel system:
http://www.veggievangogh.com/Van/VVGFuel.jpg
:::: Utilize Another's Wants. The energy of desire promises more than the
inertia of possession. -- Baltasar Gracian
:::: Jan Steinman, EcoReality Co-op ::::
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