only platform jumpable!

src/game.rs

@@ -58,7 +58,7 @@ impl Plugin for GamePlugin {
 					.with_system(move_win_text_system),
 			)
 			.add_system_to_stage(CoreStage::PostUpdate, char_char_collision_event_system)
-			.add_system_to_stage(CoreStage::PostUpdate, char_airbound_event_system)
+			.add_system_to_stage(CoreStage::PostUpdate, char_platform_collision_event_system)
 			.add_system_to_stage(CoreStage::PostUpdate, collision_event_system);
 	}
 }
@@ -107,7 +107,27 @@ pub struct Player;
 pub struct Platform;
 
 #[derive(Component)]
-pub struct Airbound(bool);
+pub struct PlatformCount(usize);
+
+impl PlatformCount {
+	fn increment(&mut self) {
+		println!("increment");
+		self.0 += 1;
+	}
+
+	fn decrement(&mut self) {
+		println!("decrement");
+		self.0 = self.0.saturating_sub(1);
+	}
+
+	fn reset(&mut self) {
+		self.0 = 0;
+	}
+
+	fn is_landed(&self) -> bool {
+		return self.0 != 0;
+	}
+}
 
 #[derive(Component)]
 pub struct Melty(pub Color);
@@ -203,7 +223,7 @@ pub fn spawn_character(
 			.insert(Sensor)
 			.insert(Collider::cuboid(30., 0.5))
 			.insert(ActiveEvents::COLLISION_EVENTS)
-			.insert(Airbound(true));
+			.insert(PlatformCount(0));
 		});
 
 	character_list.0.insert(entity_commands.id());
@@ -272,6 +292,7 @@ pub fn spawn_melty_platform(
 		.insert(Collider::cuboid(48., 8.))
 		.insert(Melty(color))
 		.insert(Level)
+        .insert(Platform)
 		.with_children(|c| {
 			c.spawn_bundle(SpriteBundle {
 				texture: asset_server.get_handle("melty.png"),
@@ -343,9 +364,9 @@ fn char_char_collision_event_system(
 	}
 }
 
-fn char_airbound_event_system(
+fn char_platform_collision_event_system(
 	mut collision_events: EventReader<CollisionEvent>,
-	mut airbound_query: Query<&mut Airbound>,
+	mut platform_count_query: Query<&mut PlatformCount>,
 	platform_query: Query<&Platform>,
 ) {
 	// detect platform + player collisions only
@@ -353,32 +374,32 @@ fn char_airbound_event_system(
         match collision_event {
 			CollisionEvent::Started(e1, e2, flags) => {
 				if *flags == CollisionEventFlags::SENSOR {
-                    if let (Ok(mut airbound), Ok(_)) = (
-                        airbound_query.get_mut(*e1),
+					if let (Ok(mut platform_count), Ok(_)) = (
+						platform_count_query.get_mut(*e1),
                         platform_query.get(*e2),
                     ) {
-                        airbound.0 = false;
-                    } else if let (Ok(mut airbound), Ok(_)) = (
-                        airbound_query.get_mut(*e2),
+						platform_count.increment();
+                    } else if let (Ok(mut platform_count), Ok(_)) = (
+						platform_count_query.get_mut(*e2),
                         platform_query.get(*e1),
                     ) {
-                        airbound.0 = false;
+						platform_count.increment();
                     }
 				}
 			}
-
+			
 			CollisionEvent::Stopped(e1, e2, flags) => {
 				if *flags == CollisionEventFlags::SENSOR {
-                    if let (Ok(mut airbound), Ok(_)) = (
-                        airbound_query.get_mut(*e1),
+                    if let (Ok(mut platform_count), Ok(_)) = (
+                        platform_count_query.get_mut(*e1),
                         platform_query.get(*e2),
                     ) {
-                        airbound.0 = true;
-                    } else if let (Ok(mut airbound), Ok(_)) = (
-                        airbound_query.get_mut(*e2),
+                        platform_count.decrement();
+                    } else if let (Ok(mut platform_count), Ok(_)) = (
+                        platform_count_query.get_mut(*e2),
                         platform_query.get(*e1),
                     ) {
-                        airbound.0 = true;
+                        platform_count.decrement();
                     }
 				}
 			}
@@ -498,7 +519,7 @@ fn change_character_system(
 fn player_movement_system(
 	keyboard_input: Res<Input<KeyCode>>,
 	mut characters: Query<(&mut Velocity, &Children), With<Player>>,
-	airbound_query: Query<&Airbound>,
+	mut platform_count_query: Query<&mut PlatformCount>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
 	let right_pressed: bool =
@@ -509,10 +530,11 @@ fn player_movement_system(
 	for (mut velocity, children) in characters.iter_mut() {
 		velocity.linvel.x = 200. * (right_pressed as i8 - left_pressed as i8) as f32;
 
-		let airbound: &Airbound = airbound_query.get(children[0]).unwrap();
-		if keyboard_input.just_pressed(KeyCode::Space) && !airbound.0 {
+		let mut platform_count: Mut<PlatformCount> = platform_count_query.get_mut(children[0]).unwrap();
+		if keyboard_input.just_pressed(KeyCode::Space) && platform_count.is_landed() {
 			audio.send(AudioMsg::Jump).ok();
 			velocity.linvel.y = 700.;
+			platform_count.reset();
 		}
 	}
 }