Fix 1.1.

src/key.rs

@@ -17,6 +17,7 @@ use crate::interpolation::Interpolation;
 /// key and the next one – if existing. Have a look at [`Interpolation`] for further details.
 ///
 /// [`Interpolation`]: crate::interpolation::Interpolation
+#[cfg(feature = "bezier")]
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 #[cfg_attr(feature = "serialization", derive(Deserialize, Serialize))]
 #[cfg_attr(feature = "serialization", serde(rename_all = "snake_case"))]
@@ -29,9 +30,36 @@ pub struct Key<T, V> {
   pub interpolation: Interpolation<T, V>
 }
 
+/// A spline control point.
+///
+/// This type associates a value at a given interpolation parameter value. It also contains an
+/// interpolation mode used to determine how to interpolate values on the segment defined by this
+/// key and the next one – if existing. Have a look at [`Interpolation`] for further details.
+///
+/// [`Interpolation`]: crate::interpolation::Interpolation
+#[cfg(not(feature = "bezier"))]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serialization", derive(Deserialize, Serialize))]
+#[cfg_attr(feature = "serialization", serde(rename_all = "snake_case"))]
+pub struct Key<T, V> {
+  /// Interpolation parameter at which the [`Key`] should be reached.
+  pub t: T,
+  /// Carried value.
+  pub value: V,
+  /// Interpolation mode.
+  pub interpolation: Interpolation<T>
+}
+
 impl<T, V> Key<T, V> {
   /// Create a new key.
+  #[cfg(feature = "bezier")]
   pub fn new(t: T, value: V, interpolation: Interpolation<T, V>) -> Self {
     Key { t, value, interpolation }
   }
+
+  /// Create a new key.
+  #[cfg(not(feature = "bezier"))]
+  pub fn new(t: T, value: V, interpolation: Interpolation<T>) -> Self {
+    Key { t, value, interpolation }
+  }
 }