I know it's possible to have a custom fill for point marks based on a conditional:
What I would like to is have the the line series change colour based on a conditional. So the portions of the line above a set value were one colour, and below that value another.
For instance, every time my Y value got above 0, the line's colour would change to red. And when the Y value went below zero, the line colour would turn blue.
Is this possible? The only way I thought of that might work is to draw annotation lines over top of portions of the line series.
Thanks for your help.