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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() | |