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snapshot: a new debug tool

I might have finally hit on the right approach: a hotkey that dumps information. Doesn't swamp me with data, and also doesn't perturb anything.

y_of_schema1 returns consistent results as I pan around. I'm just not actually printing the lines at that y. I'm printing it at that y/Viewport.zoom.

What might be confusing here is that I started out with a simple mental model:

  • perform computations in surface coordinates (sx,sy)
  • render in viewport coordinates (vx,vy)

But for text quality reasons I need to perform many computations in "scaled surface" coordinates.

Viewport coordinates are both offset and scaled relative to surface coordinates. Scaled surface = just scaled relative to surface, not offset.

I don't have a clear mental model here for when to use this.

I did already use it in one place with my simple mental model: you have to scale distances like rect.w and rect.h but it's incorrect to offset them. Maybe I'm getting this wrong somehow.

Created by  Kartik K. Agaram  on October 25, 2023
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