diff --git a/src/hexmap.rs b/src/hexmap.rs
index 1d7dcad..5ae2550 100644
--- a/src/hexmap.rs
+++ b/src/hexmap.rs
@@ -82,6 +82,10 @@ impl HexMap {
         Vec2 { x, y }
     }
 
+    fn coord_to_idx(&self, coord: Vec2<i32>) -> usize {
+        (coord.x + coord.y * self.size.x) as usize
+    }
+
     pub fn coord_to_pixel(&self, coord: Vec2<i32>) -> Vec2<i32> {
         Vec2 {
             x: coord.x * self.pix_tile_off.x,
@@ -110,6 +114,10 @@ impl HexMap {
         self.size
     }
 
+    pub fn idx_size(&self) -> usize {
+        self.size.size()
+    }
+
     //pubcrate
     pub(crate) fn draw_tile_to_image(
         &self,
@@ -122,11 +130,6 @@ impl HexMap {
             self.tileset.get(self.data[self.coord_to_idx(coord)]),
         )
     }
-
-    //priv
-    fn coord_to_idx(&self, coord: Vec2<i32>) -> usize {
-        (coord.x + coord.y * self.size.x) as usize
-    }
 }
 
 impl Distribution<Direction> for Standard {