The Zoomer plugin has some problems when using the mouse wheel

[ichaus-we]

I noticed some problems with the Zoomer plugin when using the mouse-wheel.

All of these can be reproduced with the ZoomerSample and chart-fx 11.3.0.
I uploaded some desktop videos (with audio).

Note: If using the mouse-wheel to zoom, the point under the mouse-pointer should not move but be the center of the zoom operation.

Issues:
1. On the first mouse-wheel action, the graph jumps vertically. Expected behaviour would be that the point under the mouse-pointer stays where it is, as it is the case for follow-up mouse wheel action, as well as it is the case for the horizontal axis.
Seems to be related to issue #508.
Fixed with #660

vertical_initial_jump.mp4

2. If limiting zooming to one axis, then zooming with the mouse wheel, then limiting to the other axis (without a reset-to-origin), and then turning the mouse wheel, it will result in panning instead of zooming.
   I noticed that auto-ranging is turned off after mouse wheel action, only if the zoom stack is empty (like after reset-to-origin). Expected behaviour would be to always turn off auto-ranging after a mouse wheel action, after constraining zoom to that axis

change_axis_without_reset.mp4

3. If the mouse wheel is operated quickly, the point under the mouse-pointer moves away but it should not.

quick_mouse_wheel_zoom.mp4

4. After some zooming like for issue 2, zoom-to-origin will not reset the zoom state correctly.

zoom_to_origin.mp4

Hopefully these issues can get fixed easily.

Greetings,
Markus

[wirew0rm]

Thank you for the very detailed reports, that will help a lot with reproducing and fixing the issues:+1:. I'll try to follow this up, but it might take me a while to find the time to dig into this.

[ichaus-we]

Update;
Release 11.3.1 with #660 fixes sub-issue 1 of this issue ('On the first mouse-wheel action, the graph jumps vertically').
Still open are issues 2, 3 and 4.