Metadata.

rtchallenge/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "rtchallenge"
+version = "0.1.0"

rtchallenge/Cargo.toml

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+[package]
+name = "rtchallenge"
+version = "0.1.0"
+authors = ["Bill Thiede <git@xinu.tv>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rtchallenge/README.md

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+# The Ray Tracer Challenge: A Test-Driven Guide to Your First 3D Renderer
+This is a rust implementation of https://pragprog.com/titles/jbtracer/the-ray-tracer-challenge/
+
+It attempts to be a test-driven developed ray tracer.

rtchallenge/src/lib.rs

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+mod tuples;

rtchallenge/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

rtchallenge/src/tuples.rs

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+#[derive(Debug, PartialEq)]
+struct Tuple {
+    x: f32,
+    y: f32,
+    z: f32,
+    w: f32,
+}
+
+impl Tuple {
+    fn is_point(&self) -> bool {
+        self.w == 1.0
+    }
+
+    fn is_vector(&self) -> bool {
+        self.w == 0.0
+    }
+}
+
+fn point(x: f32, y: f32, z: f32) -> Tuple {
+    tuple(x, y, z, 1.0)
+}
+
+fn vector(x: f32, y: f32, z: f32) -> Tuple {
+    tuple(x, y, z, 0.0)
+}
+
+fn tuple(x: f32, y: f32, z: f32, w: f32) -> Tuple {
+    Tuple { x, y, z, w }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{point, tuple, vector};
+    #[test]
+    fn is_point() {
+        // A tuple with w = 1 is a point
+        let a = tuple(4.3, -4.2, 3.1, 1.0);
+        assert_eq!(a.x, 4.3);
+        assert_eq!(a.y, -4.2);
+        assert_eq!(a.z, 3.1);
+        assert_eq!(a.w, 1.0);
+        assert!(a.is_point());
+        assert!(!a.is_vector());
+    }
+    #[test]
+    fn is_vector() {
+        // A tuple with w = 0 is a point
+        let a = tuple(4.3, -4.2, 3.1, 0.0);
+        assert_eq!(a.x, 4.3);
+        assert_eq!(a.y, -4.2);
+        assert_eq!(a.z, 3.1);
+        assert_eq!(a.w, 0.0);
+        assert!(!a.is_point());
+        assert!(a.is_vector());
+    }
+    #[test]
+    fn point_tuple() {
+        assert_eq!(point(4., -4., 3.), tuple(4., -4., 3., 1.))
+    }
+    #[test]
+    fn vector_tuple() {
+        assert_eq!(vector(4., -4., 3.), tuple(4., -4., 3., 0.))
+    }
+}