here’s my need:
I need to draw several square grids on the map, and each grid may contain multiple points. The darkness of the grid color represents the number of points. The size of the grid remains the same when zooming in or out the map. For example, there may be 100 points in a grid of 1:100 scale, and only 50 points in the same grid when zoomed in to 1:10. Is there any open-source library that can achieve the above functions?

example pic

for now I didn’t find useful open lib