random pos?

src/main.rs

@@ -21,10 +21,17 @@ fn model(app: &App) -> Model {
         .build()
         .unwrap();
 
-    Model {
+    let boundary = app.window_rect();
-        _window,
+    let mut particles = Vec::new();
-        particles: Vec::new(),
+
+    for _ in 0..100 {
+        let x = random_range(boundary.left(), boundary.right());
+        let y = random_range(boundary.top(), boundary.bottom());
+        let particle = Particle::new(Vec2::new(x, y));
+        particles.push(particle);
     }
+
+    Model { _window, particles }
 }
 
 // Handle events related to the window and update the model if necessary