Get Y value of series from the X Cursor position where a ChartArea is clicked on

Question

I would like to get the Y Value for a series corresponding to the X position of a ChartArea that the user has clicked-upon.

I have tried to capture the X position o

Answer 1

First convert the mouse click position to a relative position:

x= 100.0 * e.X / chart.Width

Then convert relative position to axis position:

double xMin= axis.Minimum;
double xMax= axis.Maximum;
double pMin= axis.GetPosition(xMin);
double pMax= axis.GetPosition(xMax);
xx= (x-pMin) * (xMax-xMin) / (pMax-pMin) + xMin;

Then use the axis position to probe the series (eg interpolate or nearest point as you like)