diff --git a/crates/border-wars/src/map/hex.rs b/crates/border-wars/src/map/hex.rs
index 93616f2..79a1b65 100644
--- a/crates/border-wars/src/map/hex.rs
+++ b/crates/border-wars/src/map/hex.rs
@@ -118,8 +118,8 @@ impl HexDirection {
 pub struct HexRing<T: Number> {
     current: HexPosition<T>,
     direction: HexDirection,
-    radius: usize,
-    index: usize,
+    radius: T,
+    index: T,
 }
 
 impl<T: Number> Iterator for HexRing<T> {
@@ -160,16 +160,16 @@ impl<T: Number> Iterator for HexRing<T> {
 pub struct HexSpiral<T: Number> {
     origin: HexPosition<T>,
     current: HexRing<T>,
-    radius: usize,
-    index: usize,
+    radius: T,
+    index: T,
 }
 
-impl<T: Number + AsPrimitive<usize> + FromPrimitive> Iterator for HexSpiral<T> {
+impl<T: Number> Iterator for HexSpiral<T> {
     type Item = HexPosition<T>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if self.index == 0 {
-            self.index += 1;
+        if self.index == T::TWO  {
+            self.index += T::ONE;
             return Some(self.origin);
         }
         if self.index > self.radius {
@@ -177,15 +177,15 @@ impl<T: Number + AsPrimitive<usize> + FromPrimitive> Iterator for HexSpiral<T> {
         }
         let mut result = self.current.next();
         if result.is_none() && self.index < self.radius {
-            self.index += 1;
-            self.current = self.origin.ring(T::from_usize(self.index).unwrap());
+            self.index += T::ONE;
+            self.current = self.origin.ring(self.index);
             result = self.current.next();
         }
         result
     }
 }
 
-impl<T: Number + AsPrimitive<usize> + FromPrimitive> HexPosition<T> {
+impl<T: Number> HexPosition<T> {
     /// Creates a new hexagonal position.
     pub fn new(x: T, y: T) -> Self {
         Self(x, y)
@@ -193,29 +193,27 @@ impl<T: Number + AsPrimitive<usize> + FromPrimitive> HexPosition<T> {
 
     /// Returns the distance between two hexagonal positions.
     pub fn distance(self, other: Self) -> T {
-        let HexPosition(x, y) = self - other;
+        let Self(x, y) = self - other;
         x.abs() + y.abs() + (x + y).abs() / T::TWO
     }
 
     /// Returns the hexagonal ring of the given radius.
     pub fn ring(self, radius: T) -> HexRing<T> {
-        let usize_radius = radius.as_();
         HexRing {
             current: self + HexDirection::DownLeft.to_vector() * radius,
             direction: HexDirection::Right,
-            radius: usize_radius,
-            index: 0,
+            radius,
+            index: T::ZERO,
         }
     }
 
     /// Returns the hexagonal spiral of the given radius.
     pub fn spiral(self, radius: T) -> HexSpiral<T> {
-        let usize_radius = radius.as_();
         HexSpiral {
             origin: self,
             current: self.ring(T::ONE),
-            radius: usize_radius,
-            index: 0,
+            radius,
+            index: T::ZERO,
         }
     }
 }