test_overlapping_intervals = function()
	check(overlapping_intervals(0, 1, -20, 21), 'within')
end

test_straddles_interval = function()
	check(straddles_interval(-20, 21, 0), '1')
end

test_overlapping_areas = function()
	check(
		overlapping_areas(
			{x=0, y=0, w=1, h=1},
			{x=0, y=0, w=1, h=1}),
		'identical')
end

Spawn_candidates = {}

draw_debug_definitions = function()
	for k,def in pairs(Definitions) do
		App.color{r=1, g=0, b=0}
--		love.graphics.rectangle('line', vx(def.x-20), vy(def.y-20), scale(620), scale(30))
		love.graphics.rectangle('line', vx(def.x-20), vy(def.y-20), scale(def.w+20), scale(def.h+60))
	end
	for _,cand in ipairs(Spawn_candidates) do
		App.color{r=0.4, g=0.8, b=0.4}
		love.graphics.rectangle('line', vx(cand.x), vy(cand.y), scale(800), scale(140))
		love.graphics.print(cand.name, vx(cand.x), vy(cand.y))
	end
end

Show_debug = false

draw_debug = function()
	draw_debug_definitions()
end

overlaps_any_definition = function(box)
	for k,def in pairs(Definitions) do
		if overlapping_areas(box, def) then
			print(def.key)
			box.name = def.key
			return true
		end
	end
end

-- return true if a is less than some distance from b
overlapping_areas = function(a, b)
	return overlapping_intervals(a.x, a.x+a.w, b.x-20, b.x+b.w+20)
		and overlapping_intervals(a.y, a.y+a.h, b.y-20, b.y+b.h+60)  -- leave more space below existing definitions
end

overlapping_intervals = function(alo,ahi, blo,bhi)
	return straddles_interval(alo,ahi, blo)
		or straddles_interval(alo,ahi, bhi)
		or straddles_interval(blo, bhi, alo)
		or straddles_interval(blo, bhi, ahi)
end

straddles_interval = function(lo,hi, border)
	return lo <= border and hi >= border
end

	return {
		x = math.random(Viewport.x, Viewport.x+Viewport.w),
		y = math.random(Viewport.y, Viewport.y+Viewport.h),
	}

	Spawn_candidates = {}
	for _=1,10 do
		local result = {w=600, h=100}
		result.x = math.random(Viewport.x, Viewport.x+Viewport.w)
		result.x = round(result.x/100)*100
		result.y = math.random(Viewport.y, Viewport.y+Viewport.h)
		if _ == 10 or not overlaps_any_definition(result) then
			result.w, result.h = nil
			result.x = result.x + 100
			result.y = result.y + 20
			return result
		end
		table.insert(Spawn_candidates, result)
	end

	if Show_debug then draw_debug() end

	if chord == 'C-=' then

	if chord == 'f5' then
		Show_debug = not Show_debug
	elseif chord == 'C-=' then

		new_definition()

		animate(new_definition)

	refresh_debug_animations()

end

end