diff --git a/main-window.c b/main-window.c
index b9e2ba8..564fa52 100644
--- a/main-window.c
+++ b/main-window.c
@@ -242,8 +242,6 @@ static void on_convert_clicked(gpointer button, gpointer user)
 		goto ret_layer_destroy;
 	}
 
-
-
 	/* save file dialog */
 	dialog = gtk_file_chooser_dialog_new((sett.renderer == RENDERER_LATEX_TIKZ
 					      ? "Save LaTeX File" : "Save PDF"),
diff --git a/trigonometric/bounding-box.c b/trigonometric/bounding-box.c
index 3499ce4..648ac1b 100644
--- a/trigonometric/bounding-box.c
+++ b/trigonometric/bounding-box.c
@@ -135,12 +135,26 @@ static void calculate_path_miter_points(struct vector_2d *a, struct vector_2d *b
 
 void bounding_box_calculate_path_box(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
 {
-
+	printf("Error! Function bounding_box_calculate_path_box not yet implemented!\n");
 }
 
 void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt)
 {
+	struct vector_2d point;
 
+	if (!destination || !pt) {
+		return;
+	}
+
+	if (!conv_func)
+		conv_func(pt, &point);
+	else
+		(void)vector_2d_copy(&point, (struct vector_2d *)pt);
+
+	destination->vectors.lower_left.x = MIN(destination->vectors.lower_left.x, point.x);
+	destination->vectors.lower_left.y = MIN(destination->vectors.lower_left.y, point.y);
+	destination->vectors.upper_right.x = MAX(destination->vectors.upper_right.x, point.x);
+	destination->vectors.upper_right.y = MAX(destination->vectors.upper_right.y, point.y);
 }
 
 /** @} */
diff --git a/trigonometric/vector-operations.c b/trigonometric/vector-operations.c
index 4cdbca4..0666056 100644
--- a/trigonometric/vector-operations.c
+++ b/trigonometric/vector-operations.c
@@ -76,18 +76,17 @@ struct vector_2d *vector_2d_copy(struct vector_2d *opt_res, struct vector_2d *ve
 
 	if (!vec)
 		return NULL;
-	if (opt_res) {
-		opt_res->x = vec->x;
-		opt_res->y = vec->y;
-		return opt_res;
-	} else {
+
+	if (opt_res)
+		res = opt_res;
+	else
 		res = vector_2d_alloc();
-		if (res) {
-			res->x = vec->x;
-			res->y = vec->y;
-		}
-		return res;
+
+	if (res) {
+		res->x = vec->x;
+		res->y = vec->y;
 	}
+		return res;
 }
 
 struct vector_2d *vector_2d_alloc(void)