wip rails

app/src/main.rs

@@ -22,7 +22,10 @@ fn main() {
         ))
         .insert_resource(Time::<Physics>::default().with_relative_speed(5.0))
         .insert_resource(DefaultRestitution(
-            Restitution::PERFECTLY_ELASTIC.with_combine_rule(CoefficientCombine::Max),
+            Restitution {
+                coefficient: 0.5,
+                combine_rule: CoefficientCombine::Average,
+            }
         ))
         .add_systems(Startup, setup)
         .add_systems(
@@ -51,11 +54,50 @@ fn setup(
 ) {
     commands.spawn(Camera2d);
 
+    setup_pachinko_rail(&mut commands, &mut meshes, &mut materials);
+
     if let Ok(window) = window.single() {
         spawn_screen_edges(&mut commands, &mut meshes, &mut materials, window.size());
     }
 }
 
+#[derive(Component)]
+pub struct PachinkoRail {
+    pub points: Vec<Vec2>,
+}
+
+fn setup_pachinko_rail(commands: &mut Commands, meshes: &mut Assets<Mesh>, materials: &mut Assets<ColorMaterial>) {
+    // Control points in world space (y up). The spline passes through each one.
+    // Bottom-left entry -> straight up the left wall -> arc over the top -> into the pin zone.
+    let control_points = [
+        Vec2::new(-320.0, -260.0), // rail entry (launch point)
+        Vec2::new(-330.0, -120.0),
+        Vec2::new(-330.0, 60.0),
+        Vec2::new(-320.0, 200.0),
+        Vec2::new(-260.0, 280.0),  // start of the top arc
+        Vec2::new(-160.0, 310.0),
+        Vec2::new(-60.0, 290.0),   // crest, curving down
+        Vec2::new(0.0, 240.0),     // exit: ball drops into the pins here
+    ];
+
+    // Catmull-Rom is a cardinal spline with tension 0.5.
+    // Lower tension = rounder, higher = tighter corners.
+    let curve = CubicCardinalSpline::new(0.5, control_points)
+        .to_curve()
+        .expect("need at least 2 control points");
+    
+    let points: Vec<Vec2> = curve.iter_positions(128).collect();
+
+    commands.spawn((
+        RigidBody::Static,
+        Collider::polyline(points.clone(), None),
+        Mesh2d(meshes.add(Polyline2d::new(points.iter().copied()))),
+        MeshMaterial2d(materials.add(Color::srgb_u8(255, 255, 255))),
+        Transform::from_xyz(0.0, 0.0, 0.0),
+        PachinkoRail { points },
+    ));
+}
+
 #[derive(Component, Clone, Copy)]
 struct Ball;
 
@@ -75,10 +117,12 @@ fn spawn_ball(
         && let Some(cursor_position) = window.cursor_position()
         && let Ok(world_position) = camera.viewport_to_world_2d(camera_transform, cursor_position)
     {
+        println!("world_position: {:?}", world_position);
+        
         commands.spawn((
             RigidBody::Dynamic,
             Collider::circle(CIRCLE_RADIUS),
-            LinearVelocity(Vec2::new(time.elapsed_secs().sin(), time.elapsed_secs().cos()) * 100.0),
+            LinearVelocity(Vec2::new(-100.0, 200.0)),
             Mesh2d(meshes.add(Circle::new(CIRCLE_RADIUS))),
             MeshMaterial2d(materials.add(Color::hsl(time.elapsed_secs().sin() * 360.0, 1.0, 0.5))),
             Transform::from_xyz(world_position.x, world_position.y, 0.0),