//@version=5
indicator(title="nori channel", shorttitle="nori channel", overlay=true, timeframe="", timeframe_gaps=true)
src = input(close, title="Source")
var Group1 = "ma"
ma_len1  = input.int(20, minval=1, title="Length",group=Group1)
color1   = input.color(color.red,group=Group1)

ma_len2 = input.int(40, minval=1, title="Length",group=Group1)
color2   = input.color(color.blue,group=Group1)

ma_len3  = input.int(75, minval=1, title="Length",group=Group1)
color3   = input.color(color.orange,group=Group1)

ma_len4  = input.int(200, minval=1, title="Length",group=Group1)
color4   = input.color(color.green,group=Group1)

var Group2 = "ribbon"
color_up = input.color(color.red, title="MA up", group=Group2)
color_down = input.color(color.blue, title="MA down", group=Group2)
color_transp = input.int( 85, minval=0, title="透明度", group=Group2)

//各MAを計算
ma1  = ta.sma(src, ma_len1)
ma2  = ta.sma(src, ma_len2)
ma3  = ta.ema(src, ma_len3)
ma4  = ta.sma(src, ma_len4)


//各MAを描画
plt1 = plot(ma1, color=color1, title="20sma")
plt2 = plot(ma2, color=color2, title="40sma")
plot(ma3, color=color3, title="75ema")
plot(ma4, color=color4, title="200sma")

//リボンを塗る
flag_ma = ma1 > ma2
fill_color1 = color.new( color_up, transp=color_transp )
fill_color2 = color.new( color_down, transp=color_transp )

fill(plt1,plt2, flag_ma ? fill_color1 : fill_color2 )