Polymorpism by dyn Trait and Boxes

src/main.rs

@@ -1,5 +1,5 @@
-use hello::geometry::{self, Geometry, Sphere};
+use hello::geometry::{Geometry, Line, Plane, Sphere};
-use hello::math::{Mat4x4, Point3};
+use hello::math::{Mat4x4, Point3, Vector3};
 
 use std::rc::Rc;
 
@@ -24,8 +24,8 @@ impl Texture {
 
         let mut pixel = Vec::new();
 
-        for x in 0..width {
+        for _ in 0..width {
-            for y in 0..height {
+            for _ in 0..height {
                 pixel.push(RGB {
                     red: 1.0,
                     green: 1.0,
@@ -58,11 +58,48 @@ impl RenderableGeometry {
     }
 }
 
+trait Renderable {
+    fn render(&self);
+}
+
+impl Renderable for Sphere {
+    fn render(&self) {
+        println!("Rendering Sphere!");
+    }
+}
+
+impl Renderable for Plane {
+    fn render(&self) {
+        println!("Rendering Plane!");
+    }
+}
+
+impl Renderable for Line {
+    fn render(&self) {
+        println!("Rendering Line!");
+    }
+}
+
 fn main() {
     let tex = Rc::new(Texture::load_texture());
 
     let sphere = Geometry::Sphere(Sphere::new(Point3::new(0.0, 0.0, 0.0), 1.0));
-    sphere.draw();
+    let geometries = vec![sphere];
+
+    for g in geometries {
+        g.draw();
+    }
+
+    let mut renderables: Vec<Box<dyn Renderable>> = Vec::new();
+    renderables.push(Box::new(Sphere::new(Point3::new(0.0, 0.0, 0.0), 1.0)));
+    renderables.push(Box::new(Plane::new(
+        Point3::new(0.0, 0.0, 0.0),
+        Vector3::new(0.0, 1.0, 0.0),
+    )));
+
+    for r in renderables {
+        r.render();
+    }
 
     let geo1 = RenderableGeometry::new(
         Mat4x4::ident(),