XYChart: mouse cursor behaviour associated with different X axis types

[zoony]

Moving an unsnapped (or snapped) mouse cursor around an XYChart with a ValueAxis, DateAxis or a CategoryAxis as the x-axis.

Behaviour

• Unsnapped cursor
  • X ValueAxis & X DateAxis
    • no y-value bubble displayed
  • X CategoryAxis
    • y-value Bubble displayed
• Snapped cursor
  • y-value bubble displayed for each type of x-axis
  • X ValueAxis
    • in the demo case linked below the dataset used showed the following
      • cursor jumps between widely separated x values as mouse is moved in the x-direction. This is most noticeable at a constant y value close to the max & in the region of peaks in the data
      • zoom in far enough (e.g. using zoom in button) and the cursor snaps to all data points
  • X DateAxis & X CategoryAxis
    • cursor snaps to all x values at the full x-range (at least seems to)

Setup

• A single series in an XYChart tested using each of the following axes combinations:
  • one Y ValueAxis & one X ValueAxis
  • one Y ValueAxis & one X DateAxis
  • one Y ValueAxis & one X CategoryAxis

Notes

• I've set up a demo page comparing the 3 types of x-axes with the same dataset.
• There is a checkbox to toggle cursor snapped status
  • Unsure of how to safely unsnap after snapping the mouse cursor
    • chart.cursor.snapToSeries = [] results in the two x-hairs lines not connecting anymore...

Demo page only

https://typescript-amchart-autoscale-on-zoom-27gvrz.stackblitz.io/

Demo source + output page

https://stackblitz.com/edit/typescript-amchart-autoscale-on-zoom-27gvrz

[martynasma]

I'm afraid, there's currently no way to disable cursor snapping dynamically, once it has been enabled. Sorry.

If we implement it at some point, I will let you know.

[zoony]

Bugs

If the cursor is unsnapped, the y-value bubble is not displayed when using either an X ValueAxis or an X DateAxis but is displayed when using an X CategoryAxis.

If the cursor is snapped when using an X ValueAxis, the snap jumps between widely separated x values as the mouse is moved in the x-direction. This can be seen in the demo page linked above. Snapping to each data point does occur after zooming in to display only a comparatively small number of data points.