How to get or use ChartFX internal point data?

[Xmaker]

I'm developing S/W by ChartFX's Curve Line.

I want to get x point like under attached Image.

**

I must find x value contact of y value ( y == 0 ).

But, ChartFX alredy known x value (x = 2.2) like attached Image.

How to get or use x value ?

It is possible?

Thank you.

[Frank]

Sorry, I don't understand what X-Value you are talking about.

[Xmaker]

Sorry, I can't english very well.

ex) I have 4 Point Data

[Points] 

X1 = 1, Y1 = -5

X2 = 2, Y2 = 10

X3 = 3, Y3 = 20

X4 = 4, Y4 = 21

 

This poins shown by ChartFX Curve Graph.

but, I can't find any X Position when Y Position is 0.

Of curse, Needs any spline algorithm .

But, I found X Position when Mouse move on X Axis of ChartFX.

I think easily use ChartFX's Internal Data than any spline algorithm.

I have a sample source. Do you want a sample source??

Thank you.

[Frank]

We use .NET's Graphics.DrawCurve to draw this curve.

We do not have a public API that will return you the corresponding Y for a given x in this curve.

I guess you can google the formula they use and obtain it this way.