draft for arc iterators to unify code.

Just moving code to work home, nothing to see here.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_graph.h b/source/blender/blenlib/BLI_graph.h
index 160c2e04cf5..12ca87577d5 100644
--- a/source/blender/blenlib/BLI_graph.h
+++ b/source/blender/blenlib/BLI_graph.h
@@ -60,6 +60,24 @@ typedef struct BArc {
 	int symmetry_flag;
 } BArc;
 
+struct BArcIterator;
+
+typedef float* (*PeekPointFct)(struct BArcIterator* iter, int n);
+typedef float* (*NextPointFct)(struct BArcIterator* iter);
+typedef float* (*CurrentPointFct)(struct BArcIterator* iter);
+typedef float* (*PreviousPointFct)(struct BArcIterator* iter);
+typedef int	   (*StoppedFct)(struct BArcIterator* iter);
+
+typedef struct BArcIterator {
+	PeekPointFct		peek;
+	NextPointFct		next;
+	CurrentPointFct		current;
+	PreviousPointFct	previous;
+	StoppedFct			stopped;
+	
+	int length;
+} BArcIterator;
+
 /* Helper structure for radial symmetry */
 typedef struct RadialArc
 {