tic80-stuff/awesome/screenshake.lua

-- title:  shaker
-- author: pixelbath
-- desc:   reference for screenshake effect

shake=0

wobbleDirection = 0
shakeAmount = 0

function wobbleScreen()
	shakeAmount=math.max(0,(shakeAmount-0.5))
	if shakeAmount>0 then
		t=time()/20
		offsetX=shakeAmount*math.cos(wobbleDirection)*math.sin(t)
		offsetY=shakeAmount*math.sin(wobbleDirection)*math.sin(t)
		poke(0x3ff9, offsetX)
		poke(0x3ffa, offsetY)
	end
end

function TIC()
	cls()
	map()
	print("Press B to shake!", 60, 100)
	if btnp(5) then
		shakeAmount=shakeAmount+10
		wobbleDirection=math.random()*2*math.pi
	end

	shakeScreen()
end


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