Point selection doesn't work at high zoom?

🐛 Bug

When really zoomed in—pixel level—the point selection tool doesn’t always select points.

https://user-images.githubusercontent.com/76622105/141532392-27a10d87-4e7b-4813-b5a5-c18e89e49daf.mp4

To Reproduce

Steps to reproduce the behavior:

1. Open Astronaut sample
2. Add points layer
3. Make a few points
4. Zoom in on the points, select one and move it.
5. Repeat 4, zoom in, use Select tool to move points.

Expected behavior

Points should “light up” on hover and be selectable at high zooms, just as at low zoom.

Environment

napari: 0.4.12 Platform: macOS-12.0.1-arm64-arm-64bit System: MacOS 12.0.1 Python: 3.9.6 | packaged by conda-forge | (default, Jul 6 2021, 08:51:19) [Clang 11.1.0 ] Qt: 5.15.2 PyQt5: 5.15.4 NumPy: 1.21.0 SciPy: 1.7.0 Dask: 2021.06.2 VisPy: 0.7.0

OpenGL:

• GL version: 2.1 Metal - 76.1
• MAX_TEXTURE_SIZE: 16384

Screens:

• screen 1: resolution 1680x1050, scale 2.0

Plugins:

• Measurements (skimage regionprops): 0.1.10
• StarDist: 2021.10.25
• Utilities (skimage regionprops): 0.1.10
• aicsimageio-in-memory: 0.4.1
• aicsimageio-out-of-memory: 0.4.1
• animation: 0.0.2
• clEsperanto: 0.10.7
• console: 0.0.4
• napari-tools-menu: 0.1.3
• ome-types: 0.2.6
• scikit-image: 0.4.12
• svg: 0.1.5

Additional context

I noticed this same behavior using main when testing the new points cursor.

Also, why isn’t the zoom/pan function automatically active when using the Select tool? It seems like it should be, at least to my intuition.

[brisvag]

Automatically adjusting zoom would require (as you expected) a similar fix as the one required by #3734 . That’s not trivial, cause we need access to the camera zoom from the layer, afaik.

Changing default size is not really a solution, since that would depend on what other underlying data is there and how the camera initializes its zoom depending on it… I think the only good solution is to simply rework how points are rendered 😕

Closing; further discussion should go to #2894 or vispy/vispy#2078.

[psobolewskiPhD]

Ok, what about a kludge where on mac the size is reduced with zoom? I mean your example size=1 on my end is perfectly functional both at astronaut high zoom. In fact, smaller points at high zoom seem more useful!

Otherwise, maybe change the default size to maybe 2 or 3 so the effect is less likely to be triggered? Those are both functional at default zoom for astronaut on my end.

Edit: also i meant close the issue since it’s sort of a dupe.