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How to draw an horizontal segment line using QS language

Updated on 2020-01-10 11:25:47

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This lesson will show you how to draw an horizontal line that starts at a particular bar in the past and ends at the last bar.
The line will show the last 25 bars low (25 is approx. a month).

- First we need to calculate the 25 bars low using the "llv" function
- Next we need to get the low at the last bar and this is done using the "lastvalue" function
- Next we will add a condition that will return the low if the analyzed bar is within the last 25 bars or zero otherwise
- Next we will convert each zero into NaN (Not a numeric) so that the line is not displayed at any bar that has zero as value

For the above step, you will need to download the following function: ZeroToNan

- Finally, we will plot the line and give it a red color using the "plot" function

Here is the complete code:

a = llv(low, 25);
a = lastvalue(a);
a = iff(count() > TotalBars() - 25, a, 0);
a = zerotonan(a);
plot(a, "", colorRed);

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