lights & materials: implement the default light and material types.

rtchallenge/src/lib.rs

@@ -1,5 +1,7 @@
 pub mod canvas;
 pub mod intersections;
+pub mod lights;
+pub mod materials;
 pub mod matrices;
 pub mod rays;
 pub mod spheres;

rtchallenge/src/lights.rs

@@ -0,0 +1,31 @@
+use crate::tuples::{Color, Tuple};
+
+pub struct PointLight {
+    pub position: Tuple,
+    pub intensity: Color,
+}
+
+impl PointLight {
+    /// Creates a new `PositionLight` at the given `position` and with the given
+    /// `intensity`.
+    ///
+    /// # Examples
+    /// ```
+    /// use rtchallenge::{
+    ///     lights::PointLight,
+    ///     tuples::{Color, Tuple},
+    /// };
+    ///
+    /// let intensity = Color::new(1., 1., 1.);
+    /// let position = Tuple::point(0., 0., 0.);
+    /// let light = PointLight::new(position, intensity);
+    /// assert_eq!(light.position, position);
+    /// assert_eq!(light.intensity, intensity);
+    /// ```
+    pub fn new(position: Tuple, intensity: Color) -> PointLight {
+        PointLight {
+            position,
+            intensity,
+        }
+    }
+}

rtchallenge/src/materials.rs

@@ -0,0 +1,39 @@
+use crate::tuples::Color;
+#[derive(Debug, PartialEq)]
+pub struct Material {
+    pub color: Color,
+    pub ambient: f32,
+    pub diffuse: f32,
+    pub specular: f32,
+    pub shininess: f32,
+}
+
+impl Default for Material {
+    /// Creates the default material.
+    ///
+    /// # Examples
+    /// ```
+    /// use rtchallenge::{materials::Material, tuples::Color};
+    ///
+    /// let m = Material::default();
+    /// assert_eq!(
+    ///     m,
+    ///     Material {
+    ///         color: Color::new(1., 1., 1.),
+    ///         ambient: 0.1,
+    ///         diffuse: 0.9,
+    ///         specular: 0.9,
+    ///         shininess: 200.,
+    ///     }
+    /// );
+    /// ```
+    fn default() -> Material {
+        Material {
+            color: Color::new(1., 1., 1.),
+            ambient: 0.1,
+            diffuse: 0.9,
+            specular: 0.9,
+            shininess: 200.,
+        }
+    }
+}