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"""# 🛸 On Click Callback
Once all cells are executed, click anywhere to get the closest star name. Be patient and the associated photometric points appear after a few seconds.
Powered by \
[ipyaladin](https://github.com/cds-astro/ipyaladin) and \
[Panel](https://panel.holoviz.org/index.html).
Check out the [**App Gallery**](./)
"""
import panel as pn
import requests
from ipyaladin import Aladin
from ipywidgets import Layout
pn.extension("ipywidgets", sizing_mode="stretch_width")
LoadingIndicator = "Loading..."
aladin = Aladin(
layout=Layout(width="100%"),
height=800,
target="M 36",
fov=0.3,
show_fullscreen_control=False,
)
info = pn.pane.HTML("<h2>Click the widget</h2>")
image = pn.pane.PNG(embed=True, sizing_mode="fixed")
box = pn.Column(aladin, info, image)
def process_result(data: dict) -> None:
"""Process the result of a click event on the Aladin widget.
Parameters
----------
data : dict
The data returned by the click event.
"""
box.loading = True
info.value = ""
ra = data["ra"]
dec = data["dec"]
query = (
f"SELECT TOP 1 main_id, ra, dec, DISTANCE(POINT('ICRS', {ra}, {dec}), "
f"POINT('ICRS', ra, dec)) as d FROM basic "
f"WHERE CONTAINS(POINT('ICRS', ra, dec), CIRCLE('ICRS', {ra}, {dec}, {aladin.fov.deg / 10}))=1 "
"ORDER BY d ASC"
)
r = requests.get(
"http://simbad.u-strasbg.fr/simbad/sim-tap/sync",
params={
"query": query,
"request": "doQuery",
"lang": "adql",
"format": "json",
"phase": "run",
},
)
obj_name = ""
obj_coo = None
obj_data = r.json()["data"]
if len(obj_data) == 0:
return
obj_name = obj_data[0][0]
obj_coo = [obj_data[0][1], obj_data[0][2]]
info.object = f"<h2>{obj_name}</h2><br><br>"
image.object = f"https://cdsportal.u-strasbg.fr/cgi-bin/PhotVizPreview/plot?ra={obj_coo[0]}&dec={obj_coo[1]}&radius_arcsec=5&w=200&h=150&point_size=4"
box.loading = False
aladin.set_listener("click", process_result)
pn.template.FastListTemplate(
site="ipyaladin and Panel",
site_url="./",
title="On Click Callback",
sidebar=[
pn.pane.PNG(
"https://avatars.githubusercontent.com/u/26145382?s=200&v=4",
link_url="https://cds.unistra.fr/",
),
__doc__,
],
main=[box],
accent="#296bb5",
main_layout=None,
).servable()
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