Some Macros

src/geometry.rs

@@ -1,39 +1,39 @@
 use crate::math::{Point3, Vector3};
 
-pub struct Plane {
-    point: Point3,
-    normal: Vector3,
+pub struct Plane<T> {
+    point: Point3<T>,
+    normal: Vector3<T>,
 }
 
-impl Plane {
-    pub fn new(point: Point3, normal: Vector3) -> Plane {
+impl<T> Plane<T> {
+    pub fn new(point: Point3<T>, normal: Vector3<T>) -> Plane<T> {
         Plane { point, normal }
     }
 }
 
-pub struct Line {
-    point: Point3,
-    direction: Vector3,
+pub struct Line<T> {
+    point: Point3<T>,
+    direction: Vector3<T>,
 }
 
-pub struct Sphere {
-    point: Point3,
-    radius: f64,
+pub struct Sphere<T> {
+    point: Point3<T>,
+    radius: T,
 }
 
-impl Sphere {
-    pub fn new(point: Point3, radius: f64) -> Sphere {
+impl<T> Sphere<T> {
+    pub fn new(point: Point3<T>, radius: T) -> Sphere<T> {
         Sphere { point, radius }
     }
 }
 
-pub enum Geometry {
-    Sphere(Sphere),
-    Plane(Plane),
-    Line(Line),
+pub enum Geometry<T> {
+    Sphere(Sphere<T>),
+    Plane(Plane<T>),
+    Line(Line<T>),
 }
 
-impl Geometry {
+impl<T> Geometry<T> {
     pub fn draw(&self) {
         match self {
             Geometry::Sphere(_) => {

src/main.rs

@@ -42,14 +42,18 @@ impl Texture<f64> {
     }
 }
 
-struct RenderableGeometry {
+struct RenderableGeometry<T> {
     transform: Mat4x4,
-    geometry: Geometry,
+    geometry: Geometry<T>,
     texture: Rc<Texture<f64>>,
 }
 
-impl RenderableGeometry {
-    fn new(transform: Mat4x4, geometry: Geometry, texture: Rc<Texture<f64>>) -> RenderableGeometry {
+impl<T> RenderableGeometry<T> {
+    fn new(
+        transform: Mat4x4,
+        geometry: Geometry<T>,
+        texture: Rc<Texture<f64>>,
+    ) -> RenderableGeometry<T> {
         RenderableGeometry {
             transform,
             geometry,
@@ -62,19 +66,19 @@ trait Renderable {
     fn render(&self);
 }
 
-impl Renderable for Sphere {
+impl<T> Renderable for Sphere<T> {
     fn render(&self) {
         println!("Rendering Sphere!");
     }
 }
 
-impl Renderable for Plane {
+impl<T> Renderable for Plane<T> {
     fn render(&self) {
         println!("Rendering Plane!");
     }
 }
 
-impl Renderable for Line {
+impl<T> Renderable for Line<T> {
     fn render(&self) {
         println!("Rendering Line!");
     }
@@ -120,4 +124,7 @@ fn main() {
     );
 
     println!("Reference counter = {}", Rc::strong_count(&tex));
+
+    let a = Vector3::new(2.0, 3.0, 1.0);
+    let b = 10.0 * a;
 }

src/math.rs

@@ -1,17 +1,23 @@
 use std::ops::{Add, Div, Mul, Sub};
 
+macro_rules! create_vector {
+    ($name:ident [$($elem:ident),+] ) => {
         #[derive(Copy, Clone, PartialEq, Debug)]
-pub struct Vector3<T> {
-    x: T,
-    y: T,
-    z: T,
+        pub struct $name<T> {
+            $($elem: T,)*
         }
 
-impl<T> Vector3<T> {
-    pub fn new(x: T, y: T, z: T) -> Vector3<T> {
-        Vector3 { x, y, z }
+        impl<T> $name<T> {
+            pub fn new($($elem : T,)*) -> $name<T> {
+                $name { $($elem,)* }
             }
         }
+    };
+}
+
+create_vector! { Vector4 [x, y, z, w] }
+create_vector! { Vector3 [x, y, z] }
+create_vector! { Vector2 [x, y] }
 
 impl<T> Add for Vector3<T>
 where
@@ -46,14 +52,20 @@ where
     }
 }
 
-/*
-impl<T> Mul<Vector3<T>> for f64 {
-    type Output = Vector3<T>;
+macro_rules! impl_mul_for_vector3 {
+    ($($type:ty)+) => {
+        $(
+        impl Mul<Vector3<$type>> for $type {
+            type Output = Vector3<$type>;
 
-    fn mul(self, rhs: Vector3<T>) -> Self::Output {
+            fn mul(self, rhs: Vector3<$type>) -> Self::Output {
                 Vector3::new(self * rhs.x, self * rhs.y, self * rhs.z)
             }
-}*/
+        })*
+    };
+}
+
+impl_mul_for_vector3! { i32 f32 f64 }
 
 impl<T> Mul for Vector3<T>
 where
@@ -78,30 +90,36 @@ where
 }
 
 #[derive(Copy, Clone, PartialEq, Debug)]
-pub struct Point3 {
-    x: f64,
-    y: f64,
-    z: f64,
+pub struct Point3<T> {
+    x: T,
+    y: T,
+    z: T,
 }
 
-impl Point3 {
-    pub fn new(x: f64, y: f64, z: f64) -> Point3 {
+impl<T> Point3<T> {
+    pub fn new(x: T, y: T, z: T) -> Point3<T> {
         Point3 { x, y, z }
     }
 }
 
-impl Add<Vector3<T>> for Point3 {
-    type Output = Point3;
+impl<T> Add<Vector3<T>> for Point3<T>
+where
+    T: Add<Output = T>,
+{
+    type Output = Point3<T>;
 
     fn add(self, rhs: Vector3<T>) -> Self::Output {
         Point3::new(self.x + rhs.x, self.y + rhs.y, self.z + rhs.z)
     }
 }
 
-impl Sub for Point3 {
+impl<T> Sub for Point3<T>
+where
+    T: Sub<Output = T>,
+{
     type Output = Vector3<T>;
 
-    fn sub(self, rhs: Point3) -> Self::Output {
+    fn sub(self, rhs: Point3<T>) -> Self::Output {
         Vector3::new(self.x - rhs.x, self.y - rhs.y, self.z - rhs.z)
     }
 }