1 files changed, 78 insertions, 0 deletions
diff --git a/lib/bounding-box.c b/lib/bounding-box.c
new file mode 100644
index 0000000..25f0b74
--- /dev/null
+++ b/lib/bounding-box.c
@@ -0,0 +1,78 @@
+/* bounding-box.c: definitions for bounding box operations.
+
+Copyright (C) 1992 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "config.h"
+
+#include "bounding-box.h"
+
+
+/* See the comments at `get_character_bitmap' in gf_input.c for why the
+   width and height are treated asymmetrically.  */
+
+const bounding_box_type
+dimensions_to_bb (dimensions_type dimensions)
+{
+  bounding_box_type answer;
+
+  MIN_ROW (answer) = 0;
+  MIN_COL (answer) = 0;
+  MAX_ROW (answer) = MAX ((int) DIMENSIONS_HEIGHT (dimensions) - 1, 0);
+  MAX_COL (answer) = MAX (DIMENSIONS_WIDTH (dimensions), 0);
+
+  return answer;
+}
+
+
+/* Dimensions can't be negative, even though bounding boxes can, so we
+   have to check.  */
+   
+const dimensions_type
+bb_to_dimensions (bounding_box_type bb)
+{
+  dimensions_type d;
+  
+  DIMENSIONS_WIDTH (d) = MAX (BB_WIDTH (bb), 0);
+  DIMENSIONS_HEIGHT (d) = MAX (BB_HEIGHT (bb), 0);
+  
+  return d;
+}
+
+
+/* If the point P lies outside of any of the current bounds in BB,
+   update BB.  */
+
+void
+update_real_bounding_box (real_bounding_box_type *bb, real_coordinate_type p)
+{
+  if (p.x < MIN_COL (*bb)) MIN_COL (*bb) = p.x;
+  if (p.x > MAX_COL (*bb)) MAX_COL (*bb) = p.x;
+  if (p.y < MIN_ROW (*bb)) MIN_ROW (*bb) = p.y;
+  if (p.y > MAX_ROW (*bb)) MAX_ROW (*bb) = p.y;
+    
+}
+
+
+void
+update_bounding_box (bounding_box_type *bb, coordinate_type p)
+{
+  if (p.x < MIN_COL (*bb)) MIN_COL (*bb) = p.x;
+  if (p.x > MAX_COL (*bb)) MAX_COL (*bb) = p.x;
+  if (p.y < MIN_ROW (*bb)) MIN_ROW (*bb) = p.y;
+  if (p.y > MAX_ROW (*bb)) MAX_ROW (*bb) = p.y;
+    
+}