Notice!This is documentation for v4, which is no longer actively maintained.
For up-to-date documentation, see the latest version.
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Barcoloring a series with barcolor

The
barcolor
annotation function lets you specify the color of bars. The coloring can
be conditional. The following script renders inside and outside bars
in different colors:

//@version=4
study("barcolor example", overlay=true)
isUp() => close > open
isDown() => close <= open
isOutsideUp() => high > high[1] and low < low[1] and isUp()
isOutsideDown() => high > high[1] and low < low[1] and isDown()
isInside() => high < high[1] and low > low[1]
barcolor(isInside() ? color.yellow : isOutsideUp() ? color.aqua : isOutsideDown() ? color.purple : na)

As you can see, the na value leaves bars as is.

barcolor works whether the script is running in overlay=true mode or
not.