//@version=6
indicator('MAC', overlay = true)

//MAC
MAC = input(100)
incr = input(10)
src = input(close)

//Calculations
var ma = 0.
var alpha = 0.
var k = 1 / incr

upper = ta.highest(MAC)
lower = ta.lowest(MAC)
init_ma = ta.sma(src, MAC)
cross = ta.cross(src, ma)

alpha := cross ? 2 / (MAC + 1) : src > ma and upper > upper[1] ? alpha + k : src < ma and lower < lower[1] ? alpha + k : alpha
ma := nz(ma[1] + alpha[1] * (src - ma[1]), init_ma)
plot(ma, color = color.new(color.black, 0), linewidth = 2)