TODO - GUI and UX

Quick n easy

try showing traffic signals by little boxes at the end of lanes
- red circle means right turn on red OK, red right arrow means nope, green means normal turns ok, green arrow means protected left, crosswalk hand or stick figure
if a lane could feasibly have multiple turn options but doesnt, print "ONLY"
color roads as solid black when zoomed out, and make intersections similar (except for stop sign / signal)
audit all panics
tune text color, size, padding
sort the top menus
click cycle diagram to edit duration
lane edit validity
make it easy to see current lane when changing it

revamp stop sign editor
toggle rewind mode
- sim stuff feels like a modal menu that's kinda omniprescent, but gets hidden sometimes
yellow or flashing red/yellow for yields
text box entry: highlight char looks like replace mode; draw it btwn chars

render overlapping peds reasonably
draw moving / blocked colors (gradually more red as they wait longer)
render cars with textures?
rooftops
- https://thumbs.dreamstime.com/b/top-view-city-street-asphalt-transport-people-walking-down-sidewalk-intersecting-road-pedestrian-81034411.jpg
- https://thumbs.dreamstime.com/z/top-view-city-seamless-pattern-streets-roads-houses-cars-68652655.jpg
general inspiration
- https://gifer.com/en/2svr
- https://www.fhwa.dot.gov/publications/research/safety/05078/images/fig6.gif
color tuning
- neutral (white or offwhite) color and make noncritical info close to that. http://davidjohnstone.net/pages/lch-lab-colour-gradient-picker, chroma < 50
use new arrows for drawing...
- triangle and base have a gap; why?!
  - only for turn icons?
  - draw as one polygon when fixed
- dashed thickness is way off
- last dash shouldnt appear?

speed
- show FPS or some kind of measure of lag
- sleep better in the event loop
  - first make UserInput borrow state and not need to consume
- optimize zoomed-out experience... one polygon per road
  - make sure the quadtree isn't the limiting factor though
quality
- need padding around text
- text entry needs to draw the cursor differently
- better arrows (then debug the legend plugin)
- time for a car texture?
more speculative performance ideas
- experiment with batching and not passing colors
- specialized shaders for common shapes like circles?
- try https://docs.rs/dymod/0.1.0/dymod/ to link in a release-mode ezgui crate?