// v2024_A-1_2lines
// 28/04.2023

//@version=5
//=++==============================================================++=
indicator('Contrast', overlay=true)
src = input(close, title='Source')
//dis      = input(false, type = input.bool, title="Contr?")

_coeff = input(defval=0.0, title='Coefficient')

var float alpha = math.atan(_coeff) / 3.14159265 + 0.5

//=++==============================================================++=
x = 0.0
y = 0.0
z = 0.0

if bar_index > 0
    x := (1.0 - alpha) * src + alpha * x[1]
    y := -alpha * x + x[1] + alpha * y[1]
    z := -alpha * y + y[1] + alpha * z[1]
    z

t = 2 * x - 0.5 * y - 0.5 * z
c = -x + y + z

//=++==============================================================++=
plot(t, title='Trend', color=color.new(color.red, 20), linewidth=1, style=plot.style_line)
plot(c, title='Contr', color=color.new(color.blue, 20), linewidth=1, style=plot.style_line)