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Diffstat (limited to 'src/egg-precision.c')
| -rw-r--r-- | src/egg-precision.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/egg-precision.c b/src/egg-precision.c new file mode 100644 index 0000000..02f0cce --- /dev/null +++ b/src/egg-precision.c @@ -0,0 +1,193 @@ +/* -*- 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-precision.h" + +/** + * egg_precision_round_up: + * @value: The input value + * @smallest: The smallest increment allowed + * + * 101, 10 110 + * 95, 10 100 + * 0, 10 0 + * 112, 10 120 + * 100, 10 100 + **/ +gint +egg_precision_round_up (gfloat value, gint smallest) +{ + gfloat division; + if (fabs (value) < 0.01) + return 0; + if (smallest == 0) { + egg_warning ("divisor zero"); + return 0; + } + division = (gfloat) value / (gfloat) smallest; + division = ceilf (division); + division *= smallest; + return (gint) division; +} + +/** + * egg_precision_round_down: + * @value: The input value + * @smallest: The smallest increment allowed + * + * 101, 10 100 + * 95, 10 90 + * 0, 10 0 + * 112, 10 110 + * 100, 10 100 + **/ +gint +egg_precision_round_down (gfloat value, gint smallest) +{ + gfloat division; + if (fabs (value) < 0.01) + return 0; + if (smallest == 0) { + egg_warning ("divisor zero"); + return 0; + } + division = (gfloat) value / (gfloat) smallest; + division = floorf (division); + division *= smallest; + return (gint) division; +} + +/*************************************************************************** + *** MAKE CHECK TESTS *** + ***************************************************************************/ +#ifdef EGG_TEST +#include "egg-test.h" + +void +egg_precision_test (gpointer data) +{ + guint value; + EggTest *test = (EggTest *) data; + + if (!egg_test_start (test, "EggPrecision")) + return; + + /************************************************************/ + egg_test_title (test, "limit precision down 0,10"); + value = egg_precision_round_down (0, 10); + if (value == 0) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision down 4,10"); + value = egg_precision_round_down (4, 10); + if (value == 0) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision down 11,10"); + value = egg_precision_round_down (11, 10); + if (value == 10) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision down 201,2"); + value = egg_precision_round_down (201, 2); + if (value == 200) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision down 100,10"); + value = egg_precision_round_down (100, 10); + if (value == 100) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision up 0,10"); + value = egg_precision_round_up (0, 10); + if (value == 0) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision up 4,10"); + value = egg_precision_round_up (4, 10); + if (value == 10) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision up 11,10"); + value = egg_precision_round_up (11, 10); + if (value == 20) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision up 201,2"); + value = egg_precision_round_up (201, 2); + if (value == 202) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + /************************************************************/ + egg_test_title (test, "limit precision up 100,10"); + value = egg_precision_round_up (100, 10); + if (value == 100) { + egg_test_success (test, "got %i", value); + } else { + egg_test_failed (test, "precision incorrect (%i)", value); + } + + egg_test_end (test); +} + +#endif + |