I am trying to highlight in background of my chart, when the market is flat.

Obviously, I am doing something wrong, since the background is "completely" green.

Would appreciate your expertise.

// --- Flatmarket START ---
// Calculate price range over a 10-bar period
price_range = high[20] - low[20]

// Set the threshold for flat market
threshold = 0.5 * price_range

// Check if the market is flat
flatMarket = (price_range <= threshold)
trendingMarket =  (price_range >= threshold)

// Check if the market is flat
bgcolor(flatMarket ? color.red : trendingMarket ? color.green : na)

It doesn’t work

>Solution :

Your math is off here.

price_range = high[20] - low[20] will always be a positive number because high is always greater than low. Say it is 10.

threshold will always be less than price_range because you do threshold = 0.5 * price_range. In our example threshold will be 5.

Therefore, flatMarket will always be false and trendingMarket will always be true.

flatMarket = (price_range <= threshold)  // 10 <= 5 -> false
trendingMarket =  (price_range >= threshold)  // 10 >= 5 -> true

This is why your background color is always green because flatMarket is always false and trendingMarket is always true in your bgcolor() call.

bgcolor(flatMarket ? color.red : trendingMarket ? color.green : na)