note usefulness

lib/common/src/euclidean_point.rs

@@ -0,0 +1,46 @@
+/// Euclidean point.
+/// Newtype of ideal point.
+/// Euclidean points can be offset by ideal points to create a new euclidean point.
+/// Two euclidean points cannot be added together.
+/// Subtracting two euclidean points gives an ideal point.
+// TODO: Affine*Point translates but Affine*Vector does not translate
+
+// This can be used for both Position and Time
+pub struct Absolute<P>(P);
+
+use core::ops::Add;
+use core::ops::Sub;
+use core::ops::AddAssign;
+use core::ops::SubAssign;
+
+// Offset euclidean point by ideal point
+impl<P:Add> Add<P> for Absolute<P>{
+	type Output=Absolute<P::Output>;
+	fn add(self,rhs:P)->Self::Output{
+		Absolute(self.0+rhs)
+	}
+}
+impl<P:Sub> Sub<P> for Absolute<P>{
+	type Output=Absolute<P::Output>;
+	fn sub(self,rhs:P)->Self::Output{
+		Absolute(self.0-rhs)
+	}
+}
+impl<P:AddAssign> AddAssign<P> for Absolute<P>{
+	fn add_assign(&mut self,rhs:P){
+		self.0+=rhs;
+	}
+}
+impl<P:SubAssign> SubAssign<P> for Absolute<P>{
+	fn sub_assign(&mut self,rhs:P){
+		self.0-=rhs;
+	}
+}
+
+// Extract ideal point from euclidean point
+impl<P:Sub> Sub for Absolute<P>{
+	type Output=P::Output;
+	fn sub(self,rhs:Absolute<P>)->Self::Output{
+		self.0-rhs.0
+	}
+}

lib/common/src/lib.rs

@@ -5,6 +5,7 @@ pub mod run;
 pub mod aabb;
 pub mod model;
 pub mod mouse;
+pub mod euclidean_point;
 pub mod timer;
 pub mod integer;
 pub mod physics;