prelude: create prelude and add some tuple helpers to it.

rtchallenge/src/lib.rs

@@ -37,3 +37,7 @@ pub mod float {
 }
 
 pub use float::Float;
+
+pub mod prelude {
+    pub use crate::tuples::{point, vector, Color};
+}

rtchallenge/src/tuples.rs

@@ -2,6 +2,32 @@ use std::ops::{Add, Div, Mul, Neg, Sub};
 
 use crate::{Float, EPSILON};
 
+/// Short hand for creating a Tuple that represents a point, w=1.
+///
+/// # Examples
+/// ```
+/// use rtchallenge::tuples::{point, Tuple};
+///
+/// assert_eq!(point(1., 2., 3.), Tuple::point(1., 2., 3.));
+/// assert_eq!(point(1., 2., 3.), Tuple::new(1., 2., 3., 1.));
+/// ```
+pub fn point(x: Float, y: Float, z: Float) -> Tuple {
+    Tuple::point(x, y, z)
+}
+
+/// Short hand for creating a Tuple that represents a vector, w=0.
+///
+/// # Examples
+/// ```
+/// use rtchallenge::tuples::{vector, Tuple};
+///
+/// assert_eq!(vector(1., 2., 3.), Tuple::vector(1., 2., 3.));
+/// assert_eq!(vector(1., 2., 3.), Tuple::new(1., 2., 3., 0.));
+/// ```
+pub fn vector(x: Float, y: Float, z: Float) -> Tuple {
+    Tuple::vector(x, y, z)
+}
+
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Tuple {
     pub x: Float,