Hover the blank(empty) spots

[AIMPED]

@Stunkata I don´t think that is possible with plotly. Even in dash the hoverData is only triggered, if hovering over an actual data point.

The only idea I had a while back to achieve something similar can be found here:

How to add new data point to Graph/canvas by single mouse click?

I understand. This is interesting! This is the solution I had in mind. If you do the callback clientside this could work quite well IMHO. But there is still room for improvement I guess. import json from dash import Dash, dcc, html, Input, Output, State import dash_bootstrap_components as dbc from dash.exceptions import PreventUpdate import plotly.express as px import numpy as np # create image and plotly express object fig = px.imshow( np.zeros(shape=(90, 160, 4)) ) fig.add_scatter( …