Color a single bar based on MA color change

Hi, I'm new to Pine Script and learning to write some simple codes. I've made a HMA script that changes color based on direction. Here's the code:

study(title=HMA, overlay=true)
src = input(close, title=Source)
len = input(20, title=HMA Length)
hma1 = hma(src, len)
hmacolor = change(hma1)>=0 ? color.green : color.red
plot(hma1, color=hmacolor, title=HMA)

I'm able to change the series of bar color using the following code:

barcolor(change(hma1)>=0 ? color.green : color.red)

but what i'd like instead, is to be able to change just a single bar's color(as a signal) when the direction/color of HMA changes.

Any help will be greatly appreciated.

Thanks

Try this

study(title=HMA, overlay=true)
src = input(close, title=Source)
len = input(20, title=HMA Length)
hma1 = hma(src, len)
hmacolor = change(hma1)>=0 ? color.green : color.red
plot(hma1, color=hmacolor, title=HMA)

condition = crossover(hma1, 0) ? color.green : crossunder(hma1, 0) ? color.red : na
barcolor(condition)