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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* Copyright (C) 2007-2008 Richard Hughes <richard@hughsie.com>
* Copyright (C) 2012-2021 MATE Developers
*
* 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-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) {
g_warning ("levels is 0!");
return 0;
}
return (guint) ((((gfloat) percentage * (gfloat) (levels - 1)) / 100.0f) + 0.5f);
}
/**
* 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) {
g_warning ("levels is 0!");
return 0;
}
return (guint) (((gfloat) discrete * (100.0f / (gfloat) (levels - 1))) + 0.5f);
}
/**
* 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) {
g_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
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