Add exemple

crates/border-wars/src/hex.rs

@@ -22,6 +22,17 @@ impl HexPosition {
     /// Hexagonal grid using the [cube](https://www.redblobgames.com/grids/hexagons/#coordinates) coordinate system, 
     /// is like a cube in 2D space. 
     /// The Manhattan distance between two positions is equal to:  the half of the sum of abs(dx) + abs(dy) + abs(dz)
+    /// 
+    /// # Example:
+    /// 
+    /// ```no_run
+    /// use border_wars::hex::HexPosition;
+    /// 
+    /// let a = HexPosition { q: 0, r: 0 };
+    /// let b = HexPosition { q: 1, r: 1 };
+    /// 
+    /// assert_eq!(a.distance_to(&b), 2.0);
+    /// ```
     pub fn distance_to(&self, other: &HexPosition) -> f32 {
         // dx = |x1 - x2| and x = q
         let dq = self.q - other.q;
@@ -36,7 +47,25 @@ impl HexPosition {
         (dq.abs() + dr.abs() + ds.abs()) as f32 / 2.
     }
 
-    /// Returns all positions in a given `range`.
+    /// Returns all positions within a given `range` from the current HexPosition.
+    ///
+    /// This function iterates over the possible q and r values within the specified range
+    /// and inserts HexPositions into a HashSet, ensuring that each generated position
+    /// is within the given range from the current position.
+    /// 
+    /// for more details: https://www.redblobgames.com/grids/hexagons/#range
+    /// 
+    /// # Example:
+    /// 
+    /// ```no_run
+    /// use border_wars::hex::HexPosition;
+    /// 
+    /// let position = HexPosition { q: 0, r: 0 };
+    /// 
+    /// let positions = position.range(1);
+    /// 
+    /// assert_eq!(positions.len(), 7);
+    /// ```
     pub fn range(&self, range: i32) -> HashSet<HexPosition> {
         let mut result_positions = HashSet::new();
         for q in (-range)..=range {
@@ -46,6 +75,7 @@ impl HexPosition {
         }
         result_positions
     }
+
 }
   
 impl ops::Add<HexPosition> for HexPosition {