Radar Display

Uses the PICO-8 Math and T libraries.
#include ./math.lua
#include ./t.lua

function _init()
  beam = vec2(0,-1)
  blip = vec2(80,64)

  t_every(1/60, rot_beam)
  t_every(1, move_blip)
end

function rot_beam()
  beam:rot(d2r(-6))
end

function move_blip()
  blip:add(0, 1)
end

function _update()
  t_step()
end

function _draw()
  cls()

  circfill(64,64,50,1)

  local x, y = blip:unpack()
  rectfill(x-1, y-1, x+1, y+1, 7)

  x, y = beam:clone():mul(48):add(64,64):unpack()
  line(64, 64, x, y, 12)
end