function love.load() -- do global variables get declared here?
	windowwidth = 1000
	windowheight = 1000
	sucess = love.window.setMode(windowwidth, windowheight)
	x = 30
	y = 50
	z = math.sin(math.pi/3)
	cx = 0
	cy = 0
end
function love.update(dt) -- added dt as a parameter ... is dt 1/framerate?

	if love.keyboard.isDown("up") then
		a = a*2
	end
	if love.keyboard.isDown("down") then
		a = a/2
	end
	if love.keyboard.isDown("left") then
		b = b*2
	end
	if love.keyboard.isDown("right") then
		b = b/2
	end

end
function love.draw() -- render to window
	-- y = asin(bx + c)
	love.graphics.setColor(200/255, 215/255, 0/255)
	delthe = math.pi/60 -- 3 degrees
	a = 20
	x = 0
	p = 1
	b = 3
	ps = 4 -- phase shift of 4
	odeg = math.pi/180
	for theta = -32*math.pi, 32*math.pi, odeg do

		love.graphics.line(x, a*math.sin(b*(theta))+windowwidth/2, x+odeg, a*math.sin(b*theta+odeg)+windowwidth/2)
		-- phaseshift = 3 for an interesting pattern
		--		love.graphics.line(x, a*math.sin(theta/ps)+windowwidth/2, x+odeg, a*math.sin(theta/ps+odeg)+windowwidth/2)


		x = x + 0.1
	end
	love.update()
end