Crosshair only accurate when using default CurveType.MonotoneX in AreaChart

[dennisadriaans]

When using VisArea, the VisCorsshair is only accurate when using the default CurveType.

Any tips on how to make it accurate with all CurveTypes?

[lee00678]

Hi @dennisadriaans, we follow the d3 curveType algorithm. Sometimes, when you choose a curveType like Basis, the area will be curved away from the original data position. Crosshair, however, will render the Y value in the dataset. That's why you see the difference. I'd say in this case, the crosshair is showing the accurate data.

[dennisadriaans]

Thanks for your reply, @lee00678. Is there any way to correct or adjust the values so that both of the small dots in the image match the curve? It's a little hard to see in the image as I see it now, but the two dots that are the crosshairs (right?) are a bit off.

[lee00678]

@dennisadriaans, I'm not sure if there's a straight forward way to easily make crosshair match the line. You may be able to achieve it by applying B-spline on your dataset. But I'm not sure if that's what you want because that changes the original data. Is there a reason you don't want to use MonotoneX?