Bar Coloring

isBullMarubozu = close == high and open == low
isBearMarubozu = close == low  and open == high
barcolor(isBullMarubozu ? color.lime : isBearMarubozu ? color.red : na,
         title="Marubozu")

• Returns from this call stack per bar — each bar paints independently.
• offset shifts the painted bar n positions left/right.

• Highlighting bars that match a pattern (engulfings, outside bars, high-volume candles).
• Showing a long/short regime by colouring every bar that qualifies.
• Painting a "quality" overlay over a transparent base series.

Use bgcolor() instead when you want a tint behind the whole bar area rather than a colour on the candle itself.

A translucent barcolor() blends with the pane background, not with the original candle colour — the override repaints the body from scratch over the pane background. If you need the original candle's hue to show through, use bgcolor() instead.

avgBody = ta.sma(math.abs(close - open), 20)

upBig   = close > open and (close - open) > 2 * avgBody
dnBig   = close < open and (open - close) > 2 * avgBody
inside  = high <= high[1] and low >= low[1]

barcolor(upBig   ? color.lime      :
         dnBig   ? color.red       :
         inside  ? color.gray      : na,
         title="Pattern bar")

• Backgrounds
• Colors
• Bar plotting — plotcandle for custom candles