How to draw a horiz line?

The horzline attribute only allows fixed numbers to be entered. (not calculations). Therefore, to get around the problem, we just return the calculation as a normal plot, but in such a way that it always returns the same result and appears as a horizontal line. (this is how people usually achieve horizontal lines in Metastock scripts).

Eg:

{Fixed horizontal line}
[horzline=20,80]

{Calculated horizontal line)
5*10;

{Calculated horizontal line based on price info }
lastvalue( Low * 0.9)

If you want to draw some fixed horizontal lines, use the horzline attribute. Eg: [horzline=20,80]

If you want to draw a calculated line, just make the calculation and return it as a result. Eg:
3*5;

If you want to make the calculation based on current prices, etc, then use the lastvalue function. Eg:
lastvalue( Low * 0.9);

This will calculate the result for the last bar and return that result on every bar.