tesselode

--[[
	moves rectangle A by (dx, dy) and checks for a collision
	with rectangle B.

	if no collision occurs, returns false.

	if a collision does occur, returns:
	- the time within the movement when the collision occurs (from 0-1)
	- the x component of the normal vector
	- the y component of the normal vector

tesselode

local function async(f)
	local co
	local function await(promise)
		if promise:isFinished() then return end
		promise:after(function()
			local success, message = coroutine.resume(co)
			if not success then error(message) end
		end)
		coroutine.yield()
	end

tesselode

local function sign(x)
	return x < 0 and -1 or 1
end

local function signedPower(x, n)
	return sign(x) * (math.abs(x) ^ n)
end

local regularFont = love.graphics.newFont('font/CourierPrime-Bold.ttf', 48)

tesselode

// based on https://stackoverflow.com/a/1084899
// Vec2 is from the vek crate

type Entrance = Vec2<f32>;
type Exit = Vec2<f32>;

fn line_segment_and_circle_intersections(
	line_segment_start: Vec2<f32>,
	line_segment_end: Vec2<f32>,
	circle_center: Vec2<f32>,