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-rw-r--r--libdimension/pattern.c56
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diff --git a/libdimension/pattern.c b/libdimension/pattern.c
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+/*************************************************************************
+ * Copyright (C) 2009-2010 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"
+
+/* Allocate a dummy pattern */
+dmnsn_pattern *
+dmnsn_new_pattern(void)
+{
+ dmnsn_pattern *pattern = dmnsn_malloc(sizeof(dmnsn_pattern));
+ pattern->trans = dmnsn_identity_matrix();
+ pattern->free_fn = NULL;
+ return pattern;
+}
+
+/* Delete a pattern */
+void
+dmnsn_delete_pattern(dmnsn_pattern *pattern)
+{
+ if (pattern->free_fn) {
+ (*pattern->free_fn)(pattern->ptr);
+ }
+ dmnsn_free(pattern);
+}
+
+/* Precompute the transformation matrix inverse */
+void
+dmnsn_pattern_init(dmnsn_pattern *pattern)
+{
+ pattern->trans_inv = dmnsn_matrix_inverse(pattern->trans);
+}
+
+/* Invoke the pattern callback with the right transformation */
+double
+dmnsn_pattern_value(const dmnsn_pattern *pattern, dmnsn_vector v)
+{
+ v = dmnsn_transform_vector(pattern->trans_inv, v);
+ return (*pattern->pattern_fn)(pattern, v);
+}