getting some drawing done

src/drawable.rs

@@ -0,0 +1,12 @@
+pub(crate) trait Drawable {
+    fn draw(&self, draw: &Draw);
+}
+
+impl<T> Drawable for Vec<T>
+where
+    T: Drawable,
+{
+    fn draw(&self, draw: &Draw) {
+        self.iter().for_each(|s| s.draw(draw))
+    }
+}

src/main.rs

@@ -1,3 +1,77 @@
-fn main() {
-    println!("Hello, world!");
+mod drawable;
+
+use drawable::Drawable;
+use nannou::prelude::*;
+
+#[derive(Debug)]
+struct Particle {
+    pos: Vec2,
+    radius: f32,
+}
+
+impl Particle {
+    fn new(pos: Vec2) -> Self {
+        Self {
+            pos,
+            ..Default::default()
+        }
+    }
+}
+
+impl Default for Particle {
+    fn default() -> Self {
+        Self {
+            pos: Default::default(),
+            radius: 10.0,
+        }
+    }
+}
+
+impl Drawable for Particle {
+    fn draw(&self, draw: &Draw) {
+        draw.ellipse().color(RED).radius(self.radius).xy(self.pos);
+    }
+}
+
+struct Model {
+    // Store the window ID so we can refer to this specific window later if needed.
+    _window: WindowId,
+}
+
+fn model(app: &App) -> Model {
+    // Create a new window! Store the ID so we can refer to it later.
+    let _window = app
+        .new_window()
+        .size(512, 512)
+        .title("nannou")
+        .view(view) // The function that will be called for presenting graphics to a frame.
+        .event(event) // The function that will be called when the window receives events.
+        .build()
+        .unwrap();
+
+    Model { _window }
+}
+
+// Handle events related to the window and update the model if necessary
+fn event(_app: &App, _model: &mut Model, event: WindowEvent) {
+    if let KeyReleased(Key::Escape) = event {
+        _app.quit()
+    }
+
+    println!("{:?}", event);
+}
+
+// Draw the state of your `Model` into the given `Frame` here.
+fn view(app: &App, _model: &Model, frame: Frame) {
+    let draw = app.draw();
+    draw.background().color(CORNFLOWERBLUE);
+
+    draw.ellipse().color(STEELBLUE).x_y(200.0, -100.0);
+
+    // I don't think there is even a fail condition in this function, but it returns a result?
+    draw.to_frame(app, &frame).unwrap();
+}
+
+fn main() {
+    nannou::app(model).run();
 }