From e2d6da1e349d84b491dbbea40a34200c2d58dfe6 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Mon, 8 Nov 2010 01:11:51 -0500 Subject: Add gradient pattern. --- libdimension/gradient.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 libdimension/gradient.c (limited to 'libdimension/gradient.c') 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 * + * * + * 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 * + * . * + *************************************************************************/ + +#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; +} -- cgit v1.2.3