diff --git a/trigonometric/bounding-box.c b/trigonometric/bounding-box.c
index f97b7c5..93c595e 100644
--- a/trigonometric/bounding-box.c
+++ b/trigonometric/bounding-box.c
@@ -56,3 +56,26 @@ void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t
 	box->vectors.upper_right.x = xmax;
 	box->vectors.upper_right.y = ymax;
 }
+
+void bounding_box_update_box(union bounding_box *destination, union bounding_box *update)
+{
+	if (!destination || !update)
+		return;
+
+	destination->vectors.lower_left.x = MIN(destination->vectors.lower_left.x,
+						update->vectors.lower_left.x);
+	destination->vectors.lower_left.y = MIN(destination->vectors.lower_left.y,
+						update->vectors.lower_left.y);
+	destination->vectors.upper_right.x = MAX(destination->vectors.upper_right.x,
+						update->vectors.upper_right.x);
+	destination->vectors.upper_right.y = MAX(destination->vectors.upper_right.y,
+						update->vectors.upper_right.y);
+}
+
+void bounding_box_prepare_empty(union bounding_box *box)
+{
+	box->vectors.lower_left.x = DBL_MAX;
+	box->vectors.lower_left.y = DBL_MAX;
+	box->vectors.upper_right.x = DBL_MIN;
+	box->vectors.upper_right.y = DBL_MIN;
+}
diff --git a/trigonometric/bounding-box.h b/trigonometric/bounding-box.h
index 7712cd5..33e7d39 100644
--- a/trigonometric/bounding-box.h
+++ b/trigonometric/bounding-box.h
@@ -39,5 +39,7 @@ union bounding_box {
 typedef void (*conv_generic_to_vector_2d_t)(void *, struct vector_2d *);
 
 void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
+void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
+void bounding_box_prepare_empty(union bounding_box *box);
 
 #endif /* _BOUNDING_BOX_H_ */