From 7b09710392d35fb55b52031d447a542d99fc6b4b Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Tue, 19 Aug 2014 17:10:03 -0400 Subject: Modularize the libdimension codebase. --- libdimension/pattern/gradient.c | 56 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 libdimension/pattern/gradient.c (limited to 'libdimension/pattern/gradient.c') diff --git a/libdimension/pattern/gradient.c b/libdimension/pattern/gradient.c new file mode 100644 index 0000000..f7a2b97 --- /dev/null +++ b/libdimension/pattern/gradient.c @@ -0,0 +1,56 @@ +/************************************************************************* + * Copyright (C) 2010-2014 Tavian Barnes * + * * + * 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 * + * . * + *************************************************************************/ + +/** + * @file + * Gradient pattern. + */ + +#include "dimension/pattern.h" + +/// Gradient pattern type. +typedef struct dmnns_gradient { + dmnsn_pattern pattern; + dmnsn_vector orientation; +} dmnsn_gradient; + +/// Gradient pattern callback. +static double +dmnsn_gradient_pattern_fn(const dmnsn_pattern *pattern, dmnsn_vector v) +{ + const dmnsn_gradient *gradient = (const dmnsn_gradient *)pattern; + double n = fmod(dmnsn_vector_dot(gradient->orientation, v), 1.0); + if (n < -dmnsn_epsilon) { + n += 1.0; + } + return n; +} + +dmnsn_pattern * +dmnsn_new_gradient_pattern(dmnsn_pool *pool, dmnsn_vector orientation) +{ + dmnsn_gradient *gradient = DMNSN_PALLOC(pool, dmnsn_gradient); + gradient->orientation = dmnsn_vector_normalized(orientation); + + dmnsn_pattern *pattern = &gradient->pattern; + dmnsn_init_pattern(pattern); + pattern->pattern_fn = dmnsn_gradient_pattern_fn; + return pattern; +} -- cgit v1.2.3