AmCharts Negative Base Line Trend

Question

Within a AmCharts Line Chart (Javascript) there is a setting to change the colour of the line to be different when it is negative as opposed to it being positive. Quite handy.

There is also a setting to change the base negative value from 0 to something else, say -20 or 150.

What I have is 2 line graphs, one a target line (straight gradient of 1:4) and the other is output production.

Does anyone know if there is a way to have the negativeBase value be something other than a flat number? say a formula or something like that? I would like the product line to change colour depending if it is above or below the target gradient line.

Sorry no current JS Fiddle as the production data is for a private firm.

Answer 1

No, this is not possible (I am the author of amCharts). I would suggest creating two lines, one above another. One could have full data and another one, which is above, only the data which needs to be in a different color.

Answer 2

you can use something like this

var var1=somevalue;
var var2=someothervalue;

now you can use formula in the negative base

 "negativeBase": var1*var2,