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

@@ -1,49 +1,48 @@
-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;
     let a = Vec3::dot(r.direction(), r.direction());
     let b = 2.0 * Vec3::dot(oc, r.direction());
-    let c = Vec3::dot(oc, oc) - radius*radius;
-    let discriminant = b*b - 4.0*a*c;
+    let c = Vec3::dot(oc, oc) - radius * radius;
+    let discriminant = b * b - 4.0 * a * c;
 
     if discriminant < 0.0 {
         return -1.0;
     } else {
-        return (-b - discriminant.sqrt()) / (2.0*a);
+        return (-b - discriminant.sqrt()) / (2.0 * a);
     }
 }
 
-fn ray_color(r: &Ray) -> Color{
+fn ray_color(r: &Ray) -> Color {
     let t = hit_sphere(&Point3::new(0.0, 0.0, -1.0), 0.5, r);
     if t > 0.0 {
         let n = Vec3::unit_vector(r.at(t) - Vec3::new(0.0, 0.0, -1.0));
-        return 0.5*Color::new(n.x()+1.0, n.y()+1.0, n.z()+1.0);
+        return 0.5 * Color::new(n.x() + 1.0, n.y() + 1.0, n.z() + 1.0);
     }
-    
+
     let unit_direction = r.direction();
-    let t = 0.5*(unit_direction.y() + 1.0);
-    return (1.0-t)*Color::new(1.0,1.0,1.0) + t*Color::new(0.5,0.7,1.0);
+    let t = 0.5 * (unit_direction.y() + 1.0);
+    return (1.0 - t) * Color::new(1.0, 1.0, 1.0) + t * Color::new(0.5, 0.7, 1.0);
 }
 
 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
@@ -51,29 +50,33 @@ fn main() {
     let viewport_width = aspect_ratio * viewport_height;
     let focal_length = 1.0;
 
-    let origin = Point3::new(0.0,0.0,0.0);
+    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();
     if args.len() > 1 && args[1] != "" {
         default_file = &args[1];
     }
     let mut file = BufWriter::new(File::create(default_file).unwrap());
-    writeln!(&mut file,"P3\n{image_width} {image_height}\n255\n").unwrap();
+    writeln!(&mut file, "P3\n{image_width} {image_height}\n255\n").unwrap();
 
     for j in (0..image_height).rev() {
         eprint!("\rScanlines remaining: {j:5}");
         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 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 pixel_color = ray_color(&r);
 
             color::write_color(&mut file, pixel_color);
         }
     }
     eprintln!("\nDone!");
-}
+}

src/ray.rs

@@ -3,7 +3,7 @@ use super::Vec3;
 
 pub struct Ray {
     pub orig: Point3,
-    pub dir: Vec3
+    pub dir: Vec3,
 }
 
 impl Ray {
@@ -20,6 +20,6 @@ impl Ray {
     }
 
     pub fn at(&self, t: f64) -> Point3 {
-        self.orig + t*self.dir
+        self.orig + t * self.dir
     }
-}
+}

src/vec3.rs

@@ -17,36 +17,42 @@ impl Vec3 {
         self.length_squared().sqrt()
     }
 
-    pub fn length_squared(&self) -> f64 { 
-        self.e[0]*self.e[0]
-        + self.e[1]*self.e[1]
-        + self.e[2]*self.e[2]
+    pub fn length_squared(&self) -> f64 {
+        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(),
-            a.z()*b.x() - a.x()*b.z(),
-            a.x()*b.y() - a.y()*b.x())
+        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(),
+        )
     }
 
     pub fn dot(a: Vec3, b: Vec3) -> f64 {
-        a.x()*b.x() + a.y()*b.y() + a.z()*b.z()
+        a.x() * b.x() + a.y() * b.y() + a.z() * b.z()
     }
 
     pub fn unit_vector(a: Vec3) -> 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 {
     type Output = Vec3;
 
     fn add(self, rhs: Self) -> Vec3 {
-        Vec3::new(self.x()+rhs.x(), self.y()+rhs.y(), self.z()+rhs.z())
+        Vec3::new(self.x() + rhs.x(), self.y() + rhs.y(), self.z() + rhs.z())
     }
 }
 
@@ -62,7 +68,7 @@ impl Sub for Vec3 {
     type Output = Vec3;
 
     fn sub(self, rhs: Self) -> Vec3 {
-        Vec3::new(self.x()-rhs.x(), self.y()-rhs.y(), self.z()-rhs.z())
+        Vec3::new(self.x() - rhs.x(), self.y() - rhs.y(), self.z() - rhs.z())
     }
 }
 
@@ -78,7 +84,7 @@ impl Mul<Vec3> for f64 {
     type Output = Vec3;
 
     fn mul(self, rhs: Vec3) -> Vec3 {
-        Vec3::new(self*rhs.x(), self*rhs.y(), self*rhs.z())
+        Vec3::new(self * rhs.x(), self * rhs.y(), self * rhs.z())
     }
 }
 
@@ -102,6 +108,6 @@ impl Div<f64> for Vec3 {
     type Output = Vec3;
 
     fn div(self, rhs: f64) -> Vec3 {
-        Vec3::new(self.x()/rhs, self.y()/rhs, self.z()/rhs)
+        Vec3::new(self.x() / rhs, self.y() / rhs, self.z() / rhs)
     }
-}
+}