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epilepsy-screensaver.lua

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+-- trippy screensaver
+-- LDDestroier
+
+local delay = 0.05
+
+local function dist(x1, y1, x2, y2)
+	return math.sqrt((x1 - x2)^2 + ((y1 - y2)^2 / 0.6666))
+end
+
+local char_lookup = "     -=@@=-"
+
+local function render(tick, _x, _y, width, height)
+	local line
+	local buffer = {}
+	local stick = math.sin(math.rad(tick))
+	local cx = stick                    * ((width  - 5) / 2) + (width  / 2)
+	local cy = math.cos(math.rad(tick)) * ((height - 5) / 2) + (height / 2)
+	local i
+	for y = _y, height do
+		line = ""
+		for x = _x, width do
+			i = (math.floor(
+				((stick + 1) / 3) * dist(x - tick, y - tick / 2, cx, cy) ^ 2 - tick
+			) % #char_lookup) + 1
+			line = line .. (char_lookup:sub(i, i) or " ")
+		end
+		term.setCursorPos(_x, y)
+		term.write(line)
+	end
+end
+
+local evt
+local tickTimer = os.startTimer(delay)
+local tick = 0
+
+while true do
+	evt = {os.pullEvent()}
+
+	if evt[1] == "timer" and evt[2] == tickTimer then
+		render(tick, 1, 1, term.getSize())
+		tick = (tick + 0.25) % 720
+		tickTimer = os.startTimer(delay)
+	
+	elseif evt[1] == "key" and evt[2] == keys.q then
+		sleep(0.05)
+		break
+	end
+end
+
+term.clear()
+term.setCursorPos(1, 1)
+print("Fucker")