lib(vec): support conversion to slices

Signed-off-by: Matej Focko <me@mfocko.xyz>

src/vectors/vec2d.rs

@@ -31,6 +31,10 @@ impl<T: Copy> Vector2D<T> {
     pub fn y(&self) -> T {
         self.y
     }
+
+    pub fn as_slice(&self) -> [T; 2] {
+        [self.x, self.y]
+    }
 }
 
 macro_rules! generate_indices {

src/vectors/vec3d.rs

@@ -29,6 +29,10 @@ impl<T: Copy> Vector3D<T> {
     pub fn z(&self) -> T {
         self.z
     }
+
+    pub fn as_slice(&self) -> [T; 3] {
+        [self.x, self.y, self.z]
+    }
 }
 
 // [TODO] Implement indexing