Mercurial > libervia-backend
view sat/tools/common/utils.py @ 3168:1cb232c9e845
quick frontends (widgets): added widgetNew and widgetDelete listeners:
- `widgetNew` is called when a brand new widget is created (not when a new instance is
created if there is already an existing one)
- `widgetDelete` is called when all instances of a widget (with a given widget_hash) have
been deleted.
author | Goffi <goffi@goffi.org> |
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date | Wed, 12 Feb 2020 19:46:14 +0100 |
parents | 9d0df638c8b4 |
children | 1649bbe8d07e |
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#!/usr/bin/env python3 # SàT: a XMPP client # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. """Misc utils for both backend and frontends""" def per_luminance(red, green, blue): """Caculate the perceived luminance of a RGB color @param red(int): 0-1 normalized value of red @param green(int): 0-1 normalized value of green @param blue(int): 0-1 normalized value of blue @return (float): 0-1 value of luminance (<0.5 is dark, else it's light) """ # cf. https://stackoverflow.com/a/1855903, thanks Gacek return 0.299 * red + 0.587 * green + 0.114 * blue