Use a newtype instead of a Vec2 for tile coordinates

src/geopos.rs

@@ -1,6 +1,8 @@
 use bevy::prelude::*;
 use std::f32::consts::PI;
 
+use crate::tilemap::TileCoord;
+
 /**
  * Geo-position on the (OSM-) world map (GPS position)
  *
@@ -25,11 +27,11 @@ impl GeoPos {
      * @param zoom  Zoom level of the OSM tile-name(x/y) system
      * @return coordinate in tile coordinates
      */
-    pub fn to_tile_coordinates(self, zoom: u8) -> Vec2 {
+    pub fn to_tile_coordinates(self, zoom: u8) -> TileCoord {
         let pow_zoom = 2_u32.pow(zoom.into()) as f32;
 
         // return
-        Vec2 {
+        TileCoord(Vec2 {
             // Longitude, (Längengrad) West/East "index"
             x: ((self.lon + 180.) / 360. * pow_zoom),
 
@@ -40,6 +42,6 @@ impl GeoPos {
                 * pow_zoom),
             // The Nort/South y tile name part is not linear, the tiles gets stretched to the poles
             // to compensate the stretching if the stretching of the West/East projection
-        }
+        })
     }
 }

src/lib.rs

@@ -14,6 +14,7 @@ use bevy_screen_diagnostics::{
 use geopos::GeoPos;
 use http_assets::HttpAssetReaderPlugin;
 use sun::Sky;
+use tilemap::TileCoord;
 
 type TileMap = tilemap::TileMap<8145>;
 
@@ -99,7 +100,7 @@ fn setup(
 
     if let Some((lat, lon)) = lat.zip(lon) {
         let pos = GeoPos { lat, lon };
-        Vec2 { x, y } = pos.to_tile_coordinates(15);
+        TileCoord(Vec2 { x, y }) = pos.to_tile_coordinates(15);
     }
 
     commands.spawn((

src/tilemap.rs

@@ -191,3 +191,6 @@ impl<const TILE_SIZE: u32> TileMap<TILE_SIZE> {
         Transform::from_xyz(pos.x, 0., pos.y)
     }
 }
+
+/// A coordinate in the tile coordinate system. Allows for positions within a tile.
+pub struct TileCoord(pub Vec2);