I am relatively new at data visualization. I have a line chart, however I know only few points on chart, and these points are linked with Cubic interpolation. I have built a similar chart like that: https://www.chartjs.org/samples/latest/charts/line/interpolation-modes.html. My question is that, is it solvable to find the line's values, for example when x is 4.5? I haven't really found any information about my issue, so I thought maybe somebody dealt with similar task.
I am open for any other solutions and for any other Javascipt libraries.
Thank you very much!