diff options
Diffstat (limited to 'libdimension')
| -rw-r--r-- | libdimension/Makefile.am | 1 | ||||
| -rw-r--r-- | libdimension/dimension/patterns.h | 1 | ||||
| -rw-r--r-- | libdimension/gradient.c | 50 |
3 files changed, 52 insertions, 0 deletions
diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am index 8558a48..7875682 100644 --- a/libdimension/Makefile.am +++ b/libdimension/Makefile.am @@ -66,6 +66,7 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS) \ error.c \ finish_combination.c \ geometry.c \ + gradient.c \ inlines.c \ interior.c \ light.c \ diff --git a/libdimension/dimension/patterns.h b/libdimension/dimension/patterns.h index c6dc08a..cd4aa35 100644 --- a/libdimension/dimension/patterns.h +++ b/libdimension/dimension/patterns.h @@ -26,5 +26,6 @@ #define DIMENSION_PATTERNS_H dmnsn_pattern *dmnsn_new_checker_pattern(); +dmnsn_pattern *dmnsn_new_gradient_pattern(dmnsn_vector orientation); #endif /* DIMENSION_PATTERNS_H */ diff --git a/libdimension/gradient.c b/libdimension/gradient.c new file mode 100644 index 0000000..6bcb3b8 --- /dev/null +++ b/libdimension/gradient.c @@ -0,0 +1,50 @@ +/************************************************************************* + * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of The Dimension Library. * + * * + * The Dimension Library is free software; you can redistribute it and/ * + * or modify it under the terms of the GNU Lesser General Public License * + * as published by the Free Software Foundation; either version 3 of the * + * License, or (at your option) any later version. * + * * + * The Dimension Library 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 * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +#include "dimension.h" + +/* + * Gradient pattern + */ + +static double +dmnsn_gradient_pattern_fn(const dmnsn_pattern *gradient, dmnsn_vector v) +{ + dmnsn_vector *orientation = gradient->ptr; + double n = fmod(dmnsn_vector_dot(*orientation, v), 1.0); + if (n < -dmnsn_epsilon) + n += 1.0; + return n; +} + +dmnsn_pattern * +dmnsn_new_gradient_pattern(dmnsn_vector orientation) +{ + dmnsn_pattern *gradient = dmnsn_new_pattern(); + + dmnsn_vector *payload = dmnsn_malloc(sizeof(dmnsn_vector)); + *payload = dmnsn_vector_normalize(orientation); + + gradient->pattern_fn = &dmnsn_gradient_pattern_fn; + gradient->free_fn = &dmnsn_free; + gradient->ptr = payload; + + return gradient; +} |