pico-8 cartridge // http://www.pico-8.com
version 41
__lua__

function _init()
	yyl:init()
end

function _update60()
	yyl:update()
end

function _draw()
	cls()
	yyl:draw()
end



-->8
-- yoyodyne intro v1
-- by yoyodyne

yyl = {
	ps = {},
	filled = {},
	ex = 0,
	ey = 128,
	vx = 0,
	vy = -1,
	done = false,
	maxt = 30,
	
}

function dist(x1, y1, x2, y2)
	return sqrt(
		(x2-x1)^2 + (y2-y1)^2
	)
end

function yyl:init()
	for x=0,128 do
		for y=0,100 do
			seq = 128*y + x
			
			-- y stem
			if y >= 50 and x < 54 and x > 46 then
				self.filled[seq] = 8
				self.filled[seq-6] = 12
			end
			if y >= 50 and x > 75 and x < 82 then
				self.filled[seq] = 8
				self.filled[seq+6] = 12
			end
			-- arms of y
			if y < 50 and y > 10 then
				if abs(x-y) < 4 then
					self.filled[seq] = 8
					self.filled[seq-6] = 12
				end
				if abs(128-x-y) < 4 then
					self.filled[seq] = 8
					self.filled[seq+6] = 12
				end
			end
			
			-- green o
			local od = dist(x, y, 64, 30)
			if od > 10 and od <= 15 then
				self.filled[seq] = 11
			end
			
			-- blue o
			if od > 15 and od < 20 then
				self.filled[seq] = 12
			end

		end
	end
end

function yyl:chk_stop(p)
	-- round to nearest whole
	seq = 128*flr(p.y+0.5) + flr(p.x+0.5)
	if self.filled[seq] == p.c then
		p.vx = 0
		p.vy = 0
		p.x = flr(p.x+0.5)
		p.y = flr(p.y+0.5)
		self.filled[seq] = true
		-- note! there is a bug
		-- nearby, filled is set
		-- incorrectly sometimes
		-- not sure why
	end
end

function yyl:fill_it_in()
	-- reset filled as workaround
	-- for chk_stop bug
	yyl:init()
	for i,c in pairs(self.filled) do
			y = flr(i/128)
			x = i-(128*y)
			add(self.ps, {x=x,y=y,c=c,vy=0,vx=0})
	end
	self.done = true
end

function yyl:update()
	if not self.done then
		-- emit pixels
		for c in all{8, 11, 12} do
			add(self.ps, 
				{x=self.ex, y=self.ey, c=c,
				 vy=(rnd(2)+8)*self.vy,
				 vx=(rnd(2)+8)*self.vx}
			)
		end
		
		-- fill it in?
		if t() > self.maxt then
			self:fill_it_in()
		end
	
		-- move emitter
		if self.ey == 128 and self.ex < 128 then
			self.ex += 1
			self.vx = 0
			self.vy = -1
		elseif self.ex == 128 and self.ey > 0 then
			self.ey -= 1
			self.vx = -1
			self.vy = 0
		elseif self.ey == 0 and self.ex > 0 then
			self.ex -= 1
			self.vx = 0
			self.vy = 1
		else
			self.ey += 1
			self.vx = 1
			self.vy = 0
		end
	end
	
	-- update pixels
	for i, p in pairs(self.ps) do
		if p.vy != 0 or p.vx != 0 then
			p.x += p.vx
			p.y += p.vy
			self:chk_stop(p)
			
			if p.y < 0 or p.y > 128 or p.x < 0 or p.x > 128 then
				deli(self.ps, i)
			end
		end
	end

end

function yyl:draw()
	for p in all(self.ps) do
		pset(p.x, p.y, p.c)
	end
	if self.done then
		print("d", 64, 52, 11)
		print("y", 64, 58, 11)
		print("n", 64, 64, 11)
		print("e", 64, 70, 11)
	end
end
__gfx__
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