@DabDab There is no display buffer for this data type, at least not yet. So for the moment, the only way I can think of is to draw a dummy one in a panel. And if you want the ruler, it's easy to add. But if you want the ruler AND the dots, you'll need some math depending on the selected curve...
@Christoph-Hart BTW, it would be good to have the curve selector as parameter (after the more important things you already have of course :) )