character can now only jump on platforms

src/game.rs

@@ -57,6 +57,8 @@ impl Plugin for GamePlugin {
 					.with_system(character_particle_effect_system)
 					.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, collision_event_system);
 	}
 }
@@ -102,7 +104,10 @@ pub struct CharacterColor(pub Color);
 pub struct Player;
 
 #[derive(Component)]
-pub struct CollisionCount(usize);
+pub struct Platform;
+
+#[derive(Component)]
+pub struct Airbound(bool);
 
 #[derive(Component)]
 pub struct Melty(pub Color);
@@ -190,7 +195,7 @@ pub fn spawn_character(
 			.insert(Sensor)
 			.insert(Collider::cuboid(30., 0.5))
 			.insert(ActiveEvents::COLLISION_EVENTS)
-			.insert(CollisionCount(0));
+			.insert(Airbound(true));
 		});
 
 	character_list.0.insert(entity_commands.id());
@@ -231,7 +236,8 @@ pub fn spawn_platform(
 			..default()
 		})
 		.insert(Collider::cuboid(size.x / 2., size.y / 2.))
-		.insert(Level);
+		.insert(Level)
+		.insert(Platform);
 }
 
 pub fn spawn_melty_platform(
@@ -267,33 +273,29 @@ pub fn spawn_melty_platform(
 		});
 }
 
-fn collision_event_system(
+fn char_char_collision_event_system(
 	mut commands: Commands,
-	character_meshes: Res<CharacterMeshes>,
+
-	mut materials: ResMut<Assets<ColorMaterial>>,
 	mut collision_events: EventReader<CollisionEvent>,
-	mut character_query: Query<(
+	character_query: Query<(
 		&mut CharacterColor,
 		&Transform,
 		&mut Handle<ColorMaterial>,
 		Option<&Player>,
 	)>,
-	pass_through_filter_query: Query<&PassThroughFilter>,
+
-	melty_query: Query<&Melty>,
-	mut collision_counter_query: Query<&mut CollisionCount>,
-	mut app_state: ResMut<State<AppState>>,
-	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 	mut character_list: ResMut<CharacterList>,
+	mut app_state: ResMut<State<AppState>>,
+	character_meshes: Res<CharacterMeshes>,
+	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
+	mut materials: ResMut<Assets<ColorMaterial>>,
 ) {
 	for collision_event in collision_events.iter() {
-		match collision_event {
+        if let CollisionEvent::Started(e1, e2, _flags) =  collision_event {
-			CollisionEvent::Started(e1, e2, flags) => {
-				if flags.is_empty() {
 			if let (
 				Ok((c1_color, c1_transform, _c1_material, c1_player)),
 				Ok((c2_color, c2_transform, _c2_material, c2_player)),
-					) = (character_query.get(*e1), character_query.get(*e2))
+			) = (character_query.get(*e1), character_query.get(*e2)) {
-					{
 				character_list.0.remove(e1);
 				character_list.0.remove(e2);
 				commands.entity(*e1).despawn_recursive();
@@ -303,8 +305,7 @@ fn collision_event_system(
 					.clamp(Vec4::ZERO, Vec4::ONE);
 
 				// If color approximately white
-						if app_state.current() == &AppState::Game && new_color.min_element() >= 0.9
+				if app_state.current() == &AppState::Game && new_color.min_element() >= 0.9 {
-						{
 					app_state.replace(AppState::Win).ok();
 				}
 
@@ -321,7 +322,7 @@ fn collision_event_system(
 						*c2_transform
 					} else {
 						Transform::identity().with_translation(
-									(c1_transform.translation + c2_transform.translation) / 2.,
+							(c1_transform.translation + c2_transform.translation) * 0.5,
 						)
 					},
 					new_color.into(),
@@ -329,7 +330,72 @@ fn collision_event_system(
 				);
 
 				audio.send(AudioMsg::Fusion).ok();
-					} else if let (Ok((c_color, _c_transform, _c_material, _c_player)), Ok(melty)) =
+			}
+		}
+	}
+}
+
+fn char_airbound_event_system(
+	mut collision_events: EventReader<CollisionEvent>,
+	mut airbound_query: Query<&mut Airbound>,
+	platform_query: Query<&Platform>,
+) {
+	// detect platform + player collisions only
+	for collision_event in collision_events.iter() {
+        match collision_event {
+			CollisionEvent::Started(e1, e2, flags) => {
+				if *flags == CollisionEventFlags::SENSOR {
+                    if let (Ok(mut airbound), Ok(_)) = (
+                        airbound_query.get_mut(*e1),
+                        platform_query.get(*e2),
+                    ) {
+                        airbound.0 = false;
+                    } else if let (Ok(mut airbound), Ok(_)) = (
+                        airbound_query.get_mut(*e2),
+                        platform_query.get(*e1),
+                    ) {
+                        airbound.0 = false;
+                    }
+				}
+			}
+
+			CollisionEvent::Stopped(e1, e2, flags) => {
+				if *flags == CollisionEventFlags::SENSOR {
+                    if let (Ok(mut airbound), Ok(_)) = (
+                        airbound_query.get_mut(*e1),
+                        platform_query.get(*e2),
+                    ) {
+                        airbound.0 = true;
+                    } else if let (Ok(mut airbound), Ok(_)) = (
+                        airbound_query.get_mut(*e2),
+                        platform_query.get(*e1),
+                    ) {
+                        airbound.0 = true;
+                    }
+				}
+			}
+		}
+	}
+}
+
+fn collision_event_system(
+	mut commands: Commands,
+	mut materials: ResMut<Assets<ColorMaterial>>,
+	mut collision_events: EventReader<CollisionEvent>,
+	mut character_query: Query<(
+		&mut CharacterColor,
+		&Transform,
+		&mut Handle<ColorMaterial>,
+		Option<&Player>,
+	)>,
+	pass_through_filter_query: Query<&PassThroughFilter>,
+	melty_query: Query<&Melty>,
+	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
+) {
+	for collision_event in collision_events.iter() {
+        if let CollisionEvent::Started(e1, e2, flags) =  collision_event {
+            if flags.is_empty() {
+                if let (Ok((c_color, _c_transform, _c_material, _c_player)), Ok(melty)) =
                     (character_query.get_mut(*e1), melty_query.get(*e2))
                 {
                     if (Vec4::from(melty.0) - Vec4::from(c_color.0)).max_element() <= 0. {
@@ -380,32 +446,6 @@ fn collision_event_system(
                             .ok();
                         audio.send(AudioMsg::Switch).ok();
                     }
-					} else if let (Ok(mut collision_count), Err(_)) = (
-						collision_counter_query.get_mut(*e1),
-						character_query.get_mut(*e2),
-					) {
-						collision_count.0 += 1;
-					} else if let (Ok(mut collision_count), Err(_)) = (
-						collision_counter_query.get_mut(*e2),
-						character_query.get_mut(*e1),
-					) {
-						collision_count.0 += 1;
-					}
-				}
-			}
-			CollisionEvent::Stopped(e1, e2, flags) => {
-				if *flags == CollisionEventFlags::SENSOR {
-					if let (Ok(mut collision_count), Err(_)) = (
-						collision_counter_query.get_mut(*e1),
-						character_query.get_mut(*e2),
-					) {
-						collision_count.0 = collision_count.0.saturating_sub(1);
-					} else if let (Ok(mut collision_count), Err(_)) = (
-						collision_counter_query.get_mut(*e2),
-						character_query.get_mut(*e1),
-					) {
-						collision_count.0 = collision_count.0.saturating_sub(1);
-					}
                 }
             }
 		}
@@ -450,7 +490,7 @@ fn change_character_system(
 fn player_movement_system(
 	keyboard_input: Res<Input<KeyCode>>,
 	mut characters: Query<(&mut Velocity, &Children), With<Player>>,
-	collision_counter_query: Query<&CollisionCount>,
+	airbound_query: Query<&Airbound>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
 	let right_pressed: bool =
@@ -461,9 +501,8 @@ 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;
 
-		if keyboard_input.just_pressed(KeyCode::Space)
+		let airbound: &Airbound = airbound_query.get(children[0]).unwrap();
-			&& collision_counter_query.get(children[0]).unwrap().0 != 0
+		if keyboard_input.just_pressed(KeyCode::Space) && !airbound.0 {
-		{
 			audio.send(AudioMsg::Jump).ok();
 			velocity.linvel.y = 700.;
 		}