Index: trunk/src/obj_arc.c
===================================================================
--- trunk/src/obj_arc.c	(revision 38423)
+++ trunk/src/obj_arc.c	(revision 38424)
@@ -102,13 +102,12 @@
 	return pcb_arc_alloc_id(layer, pcb_create_ID_get());
 }
 
-/* computes the bounding box of an arc */
-static rnd_box_t pcb_arc_bbox_(const pcb_arc_t *Arc, int mini)
+/* computes the centerline bounding box of an arc */
+rnd_box_t pcb_arc_bbox_cline(const pcb_arc_t *Arc)
 {
 	double ca1, ca2, sa1, sa2;
 	double minx, maxx, miny, maxy, delta;
 	rnd_angle_t ang1, ang2;
-	rnd_coord_t width;
 	rnd_box_t res;
 
 	/* first normalize angles: ang1 < ang2, both angles between 0 and 720 */
@@ -155,6 +154,17 @@
 	res.Y1 = Arc->Y + Arc->Height * miny;
 	res.Y2 = Arc->Y + Arc->Height * maxy;
 
+	return res;
+}
+
+/* computes the bounding box of an arc */
+static rnd_box_t pcb_arc_bbox_(const pcb_arc_t *Arc, int mini)
+{
+	rnd_box_t res;
+	rnd_coord_t width;
+
+	res = pcb_arc_bbox_cline(Arc);
+
 	if (!mini) {
 		width = (Arc->Thickness + Arc->Clearance) / 2;
 		/* Adjust for our discrete polygon approximation */
Index: trunk/src/obj_arc.h
===================================================================
--- trunk/src/obj_arc.h	(revision 38423)
+++ trunk/src/obj_arc.h	(revision 38424)
@@ -68,8 +68,8 @@
 void pcb_arc_flip_side(pcb_layer_t *layer, pcb_arc_t *arc);
 void pcb_arc_scale(pcb_arc_t *arc, double sx, double sy, double sth);
 rnd_box_t pcb_arc_mini_bbox(const pcb_arc_t *arc);
+rnd_box_t pcb_arc_bbox_cline(const pcb_arc_t *Arc); /* bounding box of the centerline */
 
-
 /*** hash and eq ***/
 int pcb_arc_eq(const pcb_host_trans_t *tr1, const pcb_arc_t *a1, const pcb_host_trans_t *tr2, const pcb_arc_t *a2);
 unsigned int pcb_arc_hash(const pcb_host_trans_t *tr, const pcb_arc_t *a);