Add pattern framework, impelement checker pattern.

1 files changed, 56 insertions, 0 deletions

diff --git a/libdimension/pattern.c b/libdimension/pattern.c
new file mode 100644
index 0000000..0be017f
--- /dev/null
+++ b/libdimension/pattern.c
@@ -0,0 +1,56 @@
+/*************************************************************************
+ * 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);
+}