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use bevy::{ prelude::*, ecs::schedule::SystemConfigs };
use bevy_asset_loader::asset_collection::AssetCollection;
use bevy_ecs_ldtk::{
assets::{ LdtkProject, LevelIndices, LevelMetadataAccessor },
LdtkSettings,
LdtkWorldBundle,
LevelIid,
LevelSelection,
LevelSpawnBehavior,
Respawn,
SetClearColor,
};
use bevy_rapier2d::plugin::{ RapierConfiguration, TimestepMode };
use crate::entities::Player;
pub(crate) fn level_selection_systems() -> SystemConfigs {
(update_level_selection, restart_level, respawn_world).into_configs()
}
#[derive(AssetCollection, Resource)]
pub(crate) struct LdtkAssets {
//#[asset(path = "levels/biomes.ldtk")]
#[asset(path = "levels/first_level.ldtk")]
first_level: Handle<LdtkProject>,
}
// Loads the first level of the game from an LDTK file and spawns the game world.
// It also sets up the physics configuration and the level selection resource.
pub(crate) fn spawn_ldtk_world(mut commands: Commands, ldtk_assets: Res<LdtkAssets>) {
commands.insert_resource(RapierConfiguration {
gravity: Vec2::new(0.0, -2000.0),
physics_pipeline_active: true,
query_pipeline_active: true,
timestep_mode: TimestepMode::Variable {
max_dt: 1.0 / 60.0,
time_scale: 1.0,
substeps: 1,
},
scaled_shape_subdivision: 10,
force_update_from_transform_changes: false,
});
commands.insert_resource(LevelSelection::Uid(0));
commands.insert_resource(LdtkSettings {
level_spawn_behavior: LevelSpawnBehavior::UseWorldTranslation {
load_level_neighbors: true,
},
set_clear_color: SetClearColor::FromLevelBackground,
..Default::default()
});
// 🎥
commands.spawn(Camera2dBundle::default());
commands.spawn(LdtkWorldBundle {
ldtk_handle: ldtk_assets.first_level.clone(),
..Default::default()
});
info!("Spawned ldtk world");
}
// Updates the current level selection based on the player’s position.
// If the player is within the bounds of a level, that level is set as the current level.
pub(crate) fn update_level_selection(
level_query: Query<(&LevelIid, &Transform), Without<Player>>,
player_query: Query<&Transform, With<Player>>,
mut level_selection: ResMut<LevelSelection>,
ldtk_projects: Query<&Handle<LdtkProject>>,
ldtk_project_assets: Res<Assets<LdtkProject>>
) {
for (level_iid, level_transform) in &level_query {
let ldtk_project = ldtk_project_assets
.get(ldtk_projects.single())
.expect("Project should be loaded if level has spawned");
let level = ldtk_project
.get_raw_level_by_iid(&level_iid.to_string())
.expect("Spawned level should exist in LDtk project");
let level_bounds = Rect {
min: Vec2::new(level_transform.translation.x, level_transform.translation.y),
max: Vec2::new(
level_transform.translation.x + (level.px_wid as f32),
level_transform.translation.y + (level.px_hei as f32)
),
};
for player_transform in &player_query {
if
player_transform.translation.x < level_bounds.max.x &&
player_transform.translation.x > level_bounds.min.x &&
player_transform.translation.y < level_bounds.max.y &&
player_transform.translation.y > level_bounds.min.y &&
!level_selection.is_match(&LevelIndices::default(), level)
{
debug!("Updating level selection {:?} -> {:?}", level_selection, level.iid);
*level_selection = LevelSelection::iid(level.iid.clone());
}
}
}
}
// Respawns the game world when the ‘T’ key is pressed.
// It does this by inserting a Respawn component into the entity that holds the LDtk project.
pub(crate) fn respawn_world(
mut commands: Commands,
ldtk_projects: Query<Entity, With<Handle<LdtkProject>>>,
input: Res<ButtonInput<KeyCode>>
) {
if input.just_pressed(KeyCode::KeyT) {
commands.entity(ldtk_projects.single()).insert(Respawn);
}
}
// This function restarts the current level when the ‘R’ key is pressed.
// It does this by inserting a Respawn component into all entities that are part of the current level.
pub(crate) fn restart_level(
mut commands: Commands,
level_query: Query<Entity, With<LevelIid>>,
input: Res<ButtonInput<KeyCode>>
) {
if input.just_pressed(KeyCode::KeyR) {
for level_entity in &level_query {
commands.entity(level_entity).insert(Respawn);
}
}
}
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