TODO - GUI and UX

Fix existing stuff

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
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
traffic signal cycles go offscreen sometimes!
mouseover shouldnt even be possible in lot of modes, like when a menu is active

optionally limit canvas scrolling/zooming to some map bounds
top menu doesnt know when we have a more urgent input thing going!
cant use G for geom debug mode and contextual polygon debug
on a menu with preselected thing, clicking ANYWHERE does stuff...
X on all menus
when dragging, dont give mouse movement to UI elements
start context menu when left click releases and we're not dragging
dont draw context menu off-screen
can we change labels in modal or top menu? show/hide
stacked modal menus
- should quit key for modal menus match key that started it?
- launch floodfill from context menu while following an agent... shouldnt be allowed
- can coexist: show score, search, hide
- some abstraction to just declare set_mode, give the extra width and height besides the menu, and get back a screenpt to start drawing at
bold hotkey letters

swap direction of one-way
convert between one- and two-way if there's enough space
collapse smaller roads/neighborhoods and just show aggregate stats about them (in/out flow, moving/blocked within)
undo support for edits

depict residential bldg occupany size somehow
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?
- then debug the legend plugin

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
quality
- need padding around text
- text entry needs to draw the cursor differently
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?