more new stuff

src/color.rs

@@ -1,6 +1,13 @@
-use std::io::Write;
 use super::Color;
+use std::io::Write;
 
 pub fn write_color(out: &mut impl Write, pixel_color: Color) {
-    write!(out, "{} {} {}\n", (255.999*pixel_color.x()) as u32, (255.999*pixel_color.y()) as u32, (255.999*pixel_color.z()) as u32).unwrap();
+    write!(
+        out,
+        "{} {} {}\n",
+        (255.999 * pixel_color.x()) as u32,
+        (255.999 * pixel_color.y()) as u32,
+        (255.999 * pixel_color.z()) as u32
+    )
+    .unwrap();
 }

src/main.rs

@@ -1,14 +1,14 @@
-mod vec3;
 mod color;
 mod ray;
-use vec3::Vec3;
-use vec3::Color;
-use vec3::Point3;
+mod vec3;
 use ray::Ray;
 use std::env;
 use std::fs::File;
 use std::io::BufWriter;
 use std::io::Write;
+use vec3::Color;
+use vec3::Point3;
+use vec3::Vec3;
 
 fn hit_sphere(center: &Point3, radius: f64, r: &Ray) -> f64 {
     let oc = r.origin() - *center;
@@ -37,13 +37,12 @@ fn ray_color(r: &Ray) -> Color{
 }
 
 fn main() {
-
     // File
     let mut default_file = "image.ppm";
 
     // Image
     let aspect_ratio = 16.0 / 9.0;
-    let image_width = 800;
+    let image_width = 400;
     let image_height = (image_width as f64 / aspect_ratio) as u64;
 
     // Camera
@@ -54,7 +53,8 @@ fn main() {
     let origin = Point3::new(0.0, 0.0, 0.0);
     let horizontal = Vec3::new(viewport_width, 0.0, 0.0);
     let vertical = Vec3::new(0.0, viewport_height, 0.0);
-    let lower_left_corner = origin - horizontal/2.0 - vertical/2.0 - Vec3::new(0.0, 0.0, focal_length);
+    let lower_left_corner =
+        origin - horizontal / 2.0 - vertical / 2.0 - Vec3::new(0.0, 0.0, focal_length);
 
     // Render
     let args: Vec<String> = env::args().collect();
@@ -69,7 +69,10 @@ fn main() {
         for i in 0..image_width {
             let u = i as f64 / (image_width - 1) as f64;
             let v = j as f64 / (image_height - 1) as f64;
-            let r = Ray::new(origin, lower_left_corner + u*horizontal + v*vertical - origin);
+            let r = Ray::new(
+                origin,
+                lower_left_corner + u * horizontal + v * vertical - origin,
+            );
             let pixel_color = ray_color(&r);
 
             color::write_color(&mut file, pixel_color);

src/ray.rs

@@ -3,7 +3,7 @@ use super::Vec3;
 
 pub struct Ray {
     pub orig: Point3,
-    pub dir: Vec3
+    pub dir: Vec3,
 }
 
 impl Ray {

src/vec3.rs

@@ -18,15 +18,15 @@ impl Vec3 {
     }
 
     pub fn length_squared(&self) -> f64 {
-        self.e[0]*self.e[0]
-        + self.e[1]*self.e[1]
-        + self.e[2]*self.e[2]
+        self.e[0] * self.e[0] + self.e[1] * self.e[1] + self.e[2] * self.e[2]
     }
 
     pub fn cross(a: Vec3, b: Vec3) -> Vec3 {
-        Vec3::new(a.y()*b.z() - a.z()*b.y(),
+        Vec3::new(
+            a.y() * b.z() - a.z() * b.y(),
             a.z() * b.x() - a.x() * b.z(),
-            a.x()*b.y() - a.y()*b.x())
+            a.x() * b.y() - a.y() * b.x(),
+        )
     }
 
     pub fn dot(a: Vec3, b: Vec3) -> f64 {
@@ -37,9 +37,15 @@ impl Vec3 {
         a / a.length()
     }
 
-    pub fn x(&self) -> f64 { self.e[0] }
-    pub fn y(&self) -> f64 { self.e[1] }
-    pub fn z(&self) -> f64 { self.e[2] }
+    pub fn x(&self) -> f64 {
+        self.e[0]
+    }
+    pub fn y(&self) -> f64 {
+        self.e[1]
+    }
+    pub fn z(&self) -> f64 {
+        self.e[2]
+    }
 }
 
 impl Add for Vec3 {