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authorTavian Barnes <tavianator@gmail.com>2010-11-08 01:11:51 -0500
committerTavian Barnes <tavianator@gmail.com>2010-11-08 01:11:51 -0500
commite2d6da1e349d84b491dbbea40a34200c2d58dfe6 (patch)
tree2db3b7378415e6a4d0edc63c12a1fd4f7afb2c6f /libdimension
parent809c882062182afef2f68c4440194111ec4142ab (diff)
downloaddimension-e2d6da1e349d84b491dbbea40a34200c2d58dfe6.tar.xz
Add gradient pattern.
Diffstat (limited to 'libdimension')
-rw-r--r--libdimension/Makefile.am1
-rw-r--r--libdimension/dimension/patterns.h1
-rw-r--r--libdimension/gradient.c50
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;
+}