JavaFX lineChart can't do a geometric figure

Question

I need to do a geometric figure in a LineChart like this :

The problem is to connect 1 to 2 (in the descending way). For now, I use a series for the top of the figure and another one for the bottom, but it will be better to just use one series for all, someone have an idea?

Answer 1

Just find the solution, you can change the sorting of the lineChart with setAxisSortingPolicy and put it to SortingPolicy.NONE, it will work after