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| author | Stefano Karapetsas <[email protected]> | 2011-12-11 12:55:19 +0100 |
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| committer | Stefano Karapetsas <[email protected]> | 2011-12-11 12:55:19 +0100 |
| commit | 51175189c6d7313a3b84019e39496f957c4e6164 (patch) | |
| tree | e4c2c130fa3140bca28685ef900f04a012e53dcd /src/egg-discrete.c | |
| download | mate-power-manager-51175189c6d7313a3b84019e39496f957c4e6164.tar.bz2 mate-power-manager-51175189c6d7313a3b84019e39496f957c4e6164.tar.xz | |
moved from Mate-Extra
Diffstat (limited to 'src/egg-discrete.c')
| -rw-r--r-- | src/egg-discrete.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/egg-discrete.c b/src/egg-discrete.c new file mode 100644 index 0000000..a051282 --- /dev/null +++ b/src/egg-discrete.c @@ -0,0 +1,162 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- + * + * Copyright (C) 2007-2008 Richard Hughes <[email protected]> + * + * Licensed under the GNU General Public License Version 2 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <glib.h> + +#include "egg-debug.h" +#include "egg-discrete.h" + +/** + * egg_discrete_from_percent: + * @percentage: The percentage to convert + * @levels: The number of discrete levels + * + * We have to be carefull when converting from %->discrete as precision is very + * important if we want the highest value. + * + * Return value: The discrete value for this percentage. + **/ +guint +egg_discrete_from_percent (guint percentage, guint levels) +{ + /* check we are in range */ + if (percentage > 100) + return levels; + if (levels == 0) { + egg_warning ("levels is 0!"); + return 0; + } + return ((gfloat) percentage * (gfloat) (levels - 1)) / 100.0f; +} + +/** + * egg_discrete_to_percent: + * @hw: The discrete level + * @levels: The number of discrete levels + * + * We have to be carefull when converting from discrete->%. + * + * Return value: The percentage for this discrete value. + **/ +guint +egg_discrete_to_percent (guint discrete, guint levels) +{ + /* check we are in range */ + if (discrete > levels) + return 100; + if (levels == 0) { + egg_warning ("levels is 0!"); + return 0; + } + return (guint) ((gfloat) discrete * (100.0f / (gfloat) (levels - 1))); +} + +/** + * egg_discrete_to_fraction: + * @hw: The discrete level + * @levels: The number of discrete levels + * + * We have to be careful when converting from discrete->fractions. + * + * Return value: The floating point fraction (0..1) for this discrete value. + **/ +gfloat +egg_discrete_to_fraction (guint discrete, guint levels) +{ + /* check we are in range */ + if (discrete > levels) + return 1.0; + if (levels == 0) { + egg_warning ("levels is 0!"); + return 0.0; + } + return (guint) ((gfloat) discrete / ((gfloat) (levels - 1))); +} + +/*************************************************************************** + *** MAKE CHECK TESTS *** + ***************************************************************************/ +#ifdef EGG_TEST +#include "egg-test.h" + +void +egg_discrete_test (gpointer data) +{ + guint value; + gfloat fvalue; + EggTest *test = (EggTest *) data; + + if (!egg_test_start (test, "EggDiscrete")) + return; + + /************************************************************/ + egg_test_title (test, "convert discrete 0/10 levels"); + value = egg_discrete_to_percent (0, 10); + if (value == 0) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "conversion incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "convert discrete 9/10 levels"); + value = egg_discrete_to_percent (9, 10); + if (value == 100) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "conversion incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "convert discrete 20/10 levels"); + value = egg_discrete_to_percent (20, 10); + if (value == 100) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "conversion incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "convert discrete 0/10 levels"); + fvalue = egg_discrete_to_fraction (0, 10); + if (fvalue > -0.01 && fvalue < 0.01) { + egg_test_success (test, "got %f", fvalue); + } else { + egg_test_failed (test, "conversion incorrect (%f)", fvalue); + } + + /************************************************************/ + egg_test_title (test, "convert discrete 9/10 levels"); + fvalue = egg_discrete_to_fraction (9, 10); + if (fvalue > -1.01 && fvalue < 1.01) { + egg_test_success (test, "got %f", fvalue); + } else { + egg_test_failed (test, "conversion incorrect (%f)", fvalue); + } + + egg_test_end (test); +} + +#endif + |