diff --git a/draw.view.tree b/draw.view.tree
index bbd597f..cc484f3 100644
--- a/draw.view.tree
+++ b/draw.view.tree
@@ -17,7 +17,7 @@ $hyoo_draw $mol_book2
 					grid <= grid
 					map <= map
 					yard <= yard
-					shift?val <=> center?val $mol_vector_2d /
+					shift?val <=> center?val $mol_vector_2d<number> /
 						0
 						0
 					zoom?val <=> zoom?val 1
diff --git a/pane/pane.view.tree b/pane/pane.view.tree
index 99742ac..93dc436 100644
--- a/pane/pane.view.tree
+++ b/pane/pane.view.tree
@@ -3,15 +3,15 @@ $hyoo_draw_pane $mol_plot_pane
 	tool \pencil
 	grid false
 	map false
-	yard $hyoo_sync_yard
+	yard $hyoo_sync_yard<any>
 	reset?event null
 	auto /
 		<= peer_update null
 		<= figure_current null
-	shift?val $mol_vector_2d /
+	shift?val $mol_vector_2d<number> /
 		0
 		0
-	scale?val $mol_vector_2d /
+	scale?val $mol_vector_2d<number> /
 		<= zoom
 		<= zoom
 	Map $mol_plot_map_tiles