text needs to adapt to window size

[jaredmales]

if xyz text covers fps, should hide fps. there is probably a broader issue with understanding viewport size and image location.

[jaredmales]

This could be done as part of fontLuminance. When fontMetrics gives a width, make sure it will fit in window from starting coord to be set in geom. If not, either change geom or change font size, or all of the above as needed to fit.

Maybe font size shouldn't change, just the x,y coord.