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screensaver.lua

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+local scr_x, scr_y = term.getSize()
+local mx, my = scr_x/2, scr_y/2
+local debugMode = false
+
+-- rainbow pattern
+local palette = {"e","1","4","5","d","9","b","a","2"}
+
+local distance = function(x1, y1, x2, y2)
+	return math.sqrt( (x2 - x1) ^ 2 + (y2 - y1) ^ 2 )
+end
+
+local round = function(num)
+	return math.floor(num + 0.5)
+end
+
+local render = function(iterate, xscroll, yscroll)
+	local buffer, cx, cy = {{},{},{}}
+	for y = 1, scr_y do
+		buffer[1][y] = {}
+		buffer[2][y] = {}
+		buffer[3][y] = {}
+		for x = 1, scr_x do
+			cx = ((x - mx) > 0 and 1 or -1) * (math.abs(x - mx) ^ 1.2) / 1.5
+			cy = ((y - my) > 0 and 1 or -1) * (math.abs(y - my) ^ 1.2)
+
+			buffer[1][y][x] = "\127"
+			--buffer[1][y][x] = ("FUCK"):sub(1+(cx%4),1+(cx%4))
+
+			buffer[2][y][x] = palette[1 + round(
+				iterate + distance( cx - xscroll, cy - yscroll, 0, 0 )
+			) % #palette] or " "
+
+			buffer[3][y][x] = palette[1 + round(
+				iterate + distance( cx + xscroll, cy + yscroll, 0, 0 )
+			) % #palette] or " "
+		end
+	end
+
+	for y = 1, scr_y do
+		term.setCursorPos(1,y)
+		if debugMode then
+			term.write(#buffer[1][y]..", "..#buffer[2][y]..", "..#buffer[3][y])
+		else
+			term.blit(
+				table.concat(buffer[1][y]),
+				table.concat(buffer[2][y]),
+				table.concat(buffer[3][y])
+			)
+		end
+	end
+end
+
+local main = function()
+	term.clear()
+	local wave = 0
+	while true do
+		render(
+			wave,
+			math.sin(math.rad(wave * 2)) * scr_x * 0.4,
+			math.cos(math.rad(wave * 3.5)) * scr_y * 0.4
+		)
+		wave = (wave + 1) % (360 * 7)
+		sleep(0.05)
+	end
+end
+
+local waitForInput = function()
+	local evt
+	sleep(0.25)
+	os.pullEvent("key")
+end
+
+parallel.waitForAny(main, waitForInput)
+term.clear()
+term.setCursorPos(1,1)
+sleep(0.05)