John Beard 527faddbfd GAL: provide constants for LoD HIDE/SHOW and a scale helper
Saves a mishmash of local HIDE/SHOW defs along with various literals.

Also provide a function that computes the scale at which a given
IU size becomes (notionally) a certain size on screen. While this
is a simple division, it's a bit opaque in terms of meaning.

Also it means the divide by zero case can be more universally
defended-against, which has traditionally been a bug opportunity.
2025-01-02 22:59:31 +08:00
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