Only draw scene once

src/main.rs

@@ -5,56 +5,41 @@ use std::ops::DerefMut;
 
 const JITTER: f64 = 0.5;
 
-#[derive(Component)]
-struct Grid {
-    points: Vec<Point>,
-}
-
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
         .add_plugins(VelloPlugin::default())
         .add_systems(Startup, setup_vector_graphics)
-        .add_systems(Update, simple_animation)
+        .add_systems(PostStartup, draw_map)
         .run();
 }
 
 fn setup_vector_graphics(mut commands: Commands) {
     commands.spawn((Camera2d, VelloView));
     commands.spawn(VelloScene::new());
-
-    let mut rng = rand::rng();
-    let mut points = Vec::new();
-    for x in -20..=20 {
-        for y in -10..=10 {
-            points.push(Point::new(
-                (x as f64) + rng.random_range(-JITTER..=JITTER),
-                (y as f64) + rng.random_range(-JITTER..=JITTER),
-            ));
-        }
-    }
-    commands.spawn(Grid { points });
 }
 
-fn simple_animation(
+fn draw_map(mut query_scene: Single<(&mut Transform, &mut VelloScene)>) {
-    mut query_scene: Single<(&mut Transform, &mut VelloScene)>,
-    query_grid: Query<&Grid>,
-) {
     let (transform, scene) = query_scene.deref_mut();
     // Reset scene every frame
     scene.reset();
 
-    for point in &query_grid.single().points {
+    let mut rng = rand::rng();
+    for x in -20..=20 {
+        for y in -10..=10 {
+            let point = Point::new(
+                (x as f64) + rng.random_range(-JITTER..=JITTER),
+                (y as f64) + rng.random_range(-JITTER..=JITTER),
+            );
             scene.fill(
                 peniko::Fill::NonZero,
                 kurbo::Affine::default(),
                 peniko::Color::WHITE,
                 None,
-            &kurbo::Circle::new(*point, 0.1),
+                &kurbo::Circle::new(point, 0.1),
             );
         }
+    }
 
     transform.scale = Vec3::ONE * 25.0;
-    //transform.translation = Vec3::lerp(Vec3::X * -100.0, Vec3::X * 100.0, sin_time);
-    //transform.rotation = Quat::from_rotation_z(-std::f32::consts::TAU * sin_time);
 }