From 753056d4e82094fe8993c0efade081600b14359b Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Mon, 19 Mar 2012 01:57:42 +0000
Subject: BMesh utility functions, not used yet, - BM_edge_loop_pair incase you
 need the loops rather then the faces. - BM_edge_ordered_verts_ex() - accepts
 a loop argument. - BM_edge_length_calc() - simple length calc, useful if the
 edge is in some array, saves assigning a var and using len_v3v2().

---
 source/blender/bmesh/intern/bmesh_queries.c | 49 ++++++++++++++++++++++++++---
 source/blender/bmesh/intern/bmesh_queries.h |  4 +++
 2 files changed, 49 insertions(+), 4 deletions(-)

(limited to 'source/blender/bmesh')

diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c
index 341bb877f93..53b393b3140 100644
--- a/source/blender/bmesh/intern/bmesh_queries.c
+++ b/source/blender/bmesh/intern/bmesh_queries.c
@@ -258,6 +258,14 @@ BMVert *BM_edge_other_vert(BMEdge *e, BMVert *v)
 	return bmesh_edge_other_vert_get(e, v);
 }
 
+/**
+ * Returms edge length
+ */
+float BM_edge_length_calc(BMEdge *e)
+{
+	return len_v3v3(e->v1->co, e->v2->co);
+}
+
 /**
  * Utility function, since enough times we have an edge
  * and want to access 2 connected faces.
@@ -283,6 +291,31 @@ int BM_edge_face_pair(BMEdge *e, BMFace **r_fa, BMFace **r_fb)
 	}
 }
 
+/**
+ * Utility function, since enough times we have an edge
+ * and want to access 2 connected loops.
+ *
+ * \return TRUE when only 2 faces are found.
+ */
+int BM_edge_loop_pair(BMEdge *e, BMLoop **r_la, BMLoop **r_lb)
+{
+	BMLoop *la, *lb;
+
+	if ((la = e->l) &&
+	    (lb = la->radial_next) &&
+	    (lb->radial_next == la))
+	{
+		*r_la = la;
+		*r_lb = lb;
+		return TRUE;
+	}
+	else {
+		*r_la = NULL;
+		*r_lb = NULL;
+		return FALSE;
+	}
+}
+
 /**
  *	Returns the number of edges around this vertex.
  */
@@ -599,11 +632,14 @@ BMLoop *BM_face_vert_share_loop(BMFace *f, BMVert *v)
  * BM_face_create_ngon() on an arbitrary array of verts,
  * though be sure to pick an edge which has a face.
  */
-void BM_edge_ordered_verts(BMEdge *edge, BMVert **r_v1, BMVert **r_v2)
+void BM_edge_ordered_verts_ex(BMEdge *edge, BMVert **r_v1, BMVert **r_v2,
+                              BMLoop *edge_loop)
 {
-	if ((edge->l == NULL) ||
-	    (((edge->l->prev->v == edge->v1) && (edge->l->v == edge->v2)) ||
-	     ((edge->l->v == edge->v1) && (edge->l->next->v == edge->v2)))
+	BLI_assert(edge_loop->e == edge);
+
+	if ((edge_loop == NULL) ||
+	    (((edge_loop->prev->v == edge->v1) && (edge_loop->v == edge->v2)) ||
+	     ((edge_loop->v == edge->v1) && (edge_loop->next->v == edge->v2)))
 	    )
 	{
 		*r_v1 = edge->v1;
@@ -615,6 +651,11 @@ void BM_edge_ordered_verts(BMEdge *edge, BMVert **r_v1, BMVert **r_v2)
 	}
 }
 
+void BM_edge_ordered_verts(BMEdge *edge, BMVert **r_v1, BMVert **r_v2)
+{
+	BM_edge_ordered_verts_ex(edge, r_v1, r_v2, edge->l);
+}
+
 /**
  * Calculates the angle between the previous and next loops
  * (angle at this loops face corner).
diff --git a/source/blender/bmesh/intern/bmesh_queries.h b/source/blender/bmesh/intern/bmesh_queries.h
index 2524d090a4e..4bccd869dd4 100644
--- a/source/blender/bmesh/intern/bmesh_queries.h
+++ b/source/blender/bmesh/intern/bmesh_queries.h
@@ -37,7 +37,9 @@ int     BM_edge_in_face(BMFace *f, BMEdge *e);
 int     BM_vert_in_edge(BMEdge *e, BMVert *v);
 int     BM_verts_in_edge(BMVert *v1, BMVert *v2, BMEdge *e);
 
+float   BM_edge_length_calc(BMEdge *e);
 int     BM_edge_face_pair(BMEdge *e, BMFace **r_fa, BMFace **r_fb);
+int     BM_edge_loop_pair(BMEdge *e, BMLoop **r_la, BMLoop **r_lb);
 BMVert *BM_edge_other_vert(BMEdge *e, BMVert *v);
 BMLoop *BM_face_other_edge_loop(BMFace *f, BMEdge *e, BMVert *v);
 BMLoop *BM_face_other_vert_loop(BMFace *f, BMVert *v_prev, BMVert *v);
@@ -78,5 +80,7 @@ BMVert *BM_edge_share_vert(BMEdge *e1, BMEdge *e2);
 BMLoop *BM_face_vert_share_loop(BMFace *f, BMVert *v);
 
 void    BM_edge_ordered_verts(BMEdge *edge, BMVert **r_v1, BMVert **r_v2);
+void    BM_edge_ordered_verts_ex(BMEdge *edge, BMVert **r_v1, BMVert **r_v2,
+                                 BMLoop *edge_loop);
 
 #endif /* __BMESH_QUERIES_H__ */
-- 
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