Index: trunk/src/obj_arc.c
===================================================================
--- trunk/src/obj_arc.c	(revision 714)
+++ trunk/src/obj_arc.c	(revision 715)
@@ -32,6 +32,7 @@
 #include <librnd/hid/hid_inlines.h>
 #include "geo.h"
 #include <gengeo2d/carc.h>
+#include <gengeo2d/sarc.h>
 
 static void camv_arc_free_fields(camv_any_obj_t *obj)
 {
@@ -57,11 +58,19 @@
 
 static void camv_arc_bbox(camv_any_obj_t *obj)
 {
-	TODO("real arc bbox");
-	obj->arc.bbox.x1 = obj->arc.cx - obj->arc.r - obj->arc.thick;
-	obj->arc.bbox.x2 = obj->arc.cx + obj->arc.r + obj->arc.thick;
-	obj->arc.bbox.y1 = obj->arc.cy - obj->arc.r - obj->arc.thick;
-	obj->arc.bbox.y2 = obj->arc.cy + obj->arc.r + obj->arc.thick;
+	g2d_sarc_t a;
+	g2d_box_t box;
+
+	a.c.c.x = obj->arc.cx;
+	a.c.c.y = obj->arc.cy;
+	a.c.r = obj->arc.r;
+	a.c.start = (180-obj->arc.start) / RND_RAD_TO_DEG;
+	a.c.delta = -obj->arc.delta / RND_RAD_TO_DEG;
+	a.s.width = obj->arc.thick;
+	box = g2d_sarc_bbox(&a);
+
+	obj->arc.bbox.x1 = box.p1.x; obj->arc.bbox.y1 = box.p1.y;
+	obj->arc.bbox.x2 = box.p2.x; obj->arc.bbox.y2 = box.p2.y;
 	obj->arc.bbox_valid = 1;
 }