pico8-0hh1/visuals.lua

local overlays = {}

function get_main_color(tint)
	if tint == BLUE then
		return 12
	elseif tint == YELLOW then
		return 8
	else
		return 1
	end
end

function get_shade_color(tint)
	if tint == BLUE then
		return 13
	elseif tint == YELLOW then
		return 4
	else
		return 1
	end
end

function spawn_tile_transition(x, y, w, h, from_tint, to_tint)
	local p = #patterns
	local from_color = get_main_color(from_tint)
	local to_color = get_main_color(to_tint)
	add(overlays, {
		_draw = function(self)
			fillp()
			rectfill(x, y, x + w, y + h, from_color)
			fillp(patterns[p\1]+0b0.1)
			rectfill(x, y, x + w, y + h, to_color)
			p -= 1
			if p < 1 then
				del(overlays, self)
			end
		end
	})
end