changing color of indicator based on certain market criteria

[spectastic]

I'd like to modify the stocks above 50 MA breath indicator to be color coded where it's one color when qqq 10 MA is above the 20 MA, and another color when it's below. New to thinkscript, but any ideas how to execute this?

 

[mashume]

I don't know what the 50 MA breadth indicator is, but I've subbed in a simple moving average to illustrate:

def qqq_Close = close(symbol = "QQQ");
def qqq_ma_10 = SimpleMovingAvg(price = qqq_Close, length = 10);
def qqq_ma_20 = SimpleMovingAvg(price = qqq_Close, length = 20);
def qqq_10_above_20 = if qqq_ma_10 > qqq_ma_20 then 1 else 0;
plot indicator = SimpleMovingAvg(CLOSE, 50);
indicator.AssignValueColor(if qqq_10_above_20 == 1 then color.green else color.red);

Explanation:
First, we define a qqq_close by using the symbol attribute. Then we can create series of the qqq moving average. Once we have the two moving averages, we compare them and assign 1 to qqq_10_above_20 if it is true, and zero if it is not. I like to be explicit in code and not rely on implicit true and false. Just the way I roll.
Once we have that value, we can plot any indicator and use the AssignValueColor() property of the plot to set the color based on the current value of the qq_10_abote_20 series. if it is 1, then the 10 is above the 20 and we plot the indicator in green. If it is not 1 (then it is 0) then we plot the indicator line in red.

Hope that helps.

-mashume