better drawable

src/drawable.rs

@@ -12,3 +12,19 @@ where
         self.iter().for_each(|s| s.draw(draw))
     }
 }
+
+pub(crate) trait DrawShape<T>
+where
+    T: Drawable,
+{
+    fn draw(&self, drawable: &T);
+}
+
+impl<T> DrawShape<T> for Draw
+where
+    T: Drawable,
+{
+    fn draw(&self, drawable: &T) {
+        drawable.draw(self);
+    }
+}

src/main.rs

@@ -1,10 +1,13 @@
 mod drawable;
 mod particle;
 
-use drawable::Drawable;
+use drawable::{DrawShape, Drawable};
 use nannou::prelude::*;
 use particle::Particle;
 
+const PARTICLE_COUNT: u32 = 200;
+const PARTICLE_SIZE: f32 = 10.0;
+
 struct Model {
     // Store the window ID so we can refer to this specific window later if needed.
     _window: WindowId,
@@ -14,7 +17,7 @@ struct Model {
 fn fill_particles(app: &App, particles: &mut Vec<Particle>) {
     let boundary = app.window_rect();
 
-    for _ in 0..200 {
+    for _ in 0..PARTICLE_COUNT {
         let x = random_range(boundary.left(), boundary.right());
         let y = random_range(boundary.top(), boundary.bottom());
 
@@ -59,13 +62,13 @@ fn event(app: &App, model: &mut Model, event: WindowEvent) {
 
 // Draw the state of your `Model` into the given `Frame` here.
 fn view(app: &App, model: &Model, frame: Frame) {
-    let draw = app.draw();
+    let canvas = app.draw();
-    draw.background().color(CORNFLOWERBLUE);
+    canvas.background().color(CORNFLOWERBLUE);
 
-    model.particles.draw(&draw);
+    canvas.draw(&model.particles);
 
     // I don't think there is even a fail condition in this function, but it returns a result?
-    draw.to_frame(app, &frame).unwrap();
+    canvas.to_frame(app, &frame).unwrap();
 }
 
 fn main() {

src/particle.rs

@@ -1,6 +1,5 @@
-use drawable::Drawable;
+use crate::drawable::Drawable;
-
+use crate::PARTICLE_SIZE;
-use crate::drawable;
 
 use nannou::prelude::*;
 
@@ -23,7 +22,7 @@ impl Default for Particle {
     fn default() -> Self {
         Self {
             pos: Default::default(),
-            radius: 10.0,
+            radius: PARTICLE_SIZE,
         }
     }
 }