How to get x and y axis value when we hover the mouse

[AIMPED]

Hey @vicho29 welcome to the forums.

I’m not sure I understand you correctly, but you want to show the spike lines all the time, no matter if there’s a scatter marker or not?

Something like this?

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( …