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use std::marker::PhantomData;
use bevy::ecs::system::SystemParam;
use bevy::prelude::*;
use ldtk_rust::{EntityInstance, LayerInstance, Level, TileInstance};
// use crate::assets::level_index::LevelIndex;
use crate::assets::{LdtkProject, LevelIndex};
use crate::get_ldtk_tile_scale;
use crate::utils::ActiveLevel;
#[derive(SystemParam)]
pub struct MapQuery<'w, 's> {
assets: Res<'w, Assets<LdtkProject>>,
active: Option<Res<'w, ActiveLevel>>,
index: Res<'w, LevelIndex>,
#[system_param(ignore)]
_e: PhantomData<&'s ()>,
}
pub struct TileRef<'a> {
pub tile: &'a TileInstance,
}
impl<'a> TileRef<'a> {
pub fn new(tile: &'a TileInstance) -> Self {
TileRef { tile }
}
}
impl<'a> TileRef<'a> {
pub fn gid(&self) -> usize {
(self.tile.src[0] * self.tile.src[1]).unsigned_abs() as usize
}
}
pub struct LayerRef<'a> {
pub idx: usize,
pub layer: &'a LayerInstance,
}
impl<'a> LayerRef<'a> {
pub fn new(idx: usize, layer: &'a LayerInstance) -> Self {
LayerRef { layer, idx }
}
pub fn has_tiles(&self) -> bool {
!(self.layer.auto_layer_tiles.is_empty() && self.layer.grid_tiles.is_empty())
}
pub fn for_each_tile(&self, mut cb: impl FnMut(i64, i64, TileRef)) {
self.layer
.grid_tiles
.iter()
.chain(self.layer.auto_layer_tiles.iter())
.for_each(|tile: &TileInstance| {
let (x, y) = match tile.px.as_slice() {
&[x, y] => (x, y),
_ => {
return;
}
};
cb(x, y, TileRef::new(tile));
});
}
pub fn get_z_delta(&self) -> f32 {
(self.idx as f32) / 100.0
}
// pub fn get_tile_metadata_of(&self, tile_id: i64) {
// self.layer.til
// }
}
#[derive(Copy, Clone, Debug)]
pub struct CameraBounds {
pub left: f32,
pub top: f32,
pub bottom: f32,
pub right: f32,
}
impl CameraBounds {
pub fn get_min_x(&self, camera_width: f32) -> f32 {
self.left + (camera_width / 2.0) - (get_ldtk_tile_scale() / 2.0)
}
pub fn get_max_x(&self, camera_width: f32) -> f32 {
self.right - (camera_width / 2.0) - (get_ldtk_tile_scale() / 2.0)
}
pub fn get_min_y(&self, camera_height: f32) -> f32 {
self.bottom + (camera_height / 2.0) - (get_ldtk_tile_scale() / 2.0)
}
pub fn get_max_y(&self, camera_height: f32) -> f32 {
self.top - (camera_height / 2.0) - (get_ldtk_tile_scale() / 2.0)
}
}
impl<'w, 's> MapQuery<'w, 's> {
// --- We put our logic in static accessors because we might source a level other
// --- than the currently active one. 'active' methods are a convenience to
// --- call the static accessors on whatever the current level is
pub fn for_each_layer_of(level: &Level, mut cb: impl FnMut(LayerRef)) {
if let Some(layers) = level.layer_instances.as_ref() {
for layer in layers.iter().rev().enumerate() {
cb(LayerRef::new(layer.0, layer.1));
}
}
}
pub fn get_entities_of(level: &Level) -> Vec<&EntityInstance> {
level
.layer_instances
.as_ref()
.map(|layers| {
layers
.iter()
.flat_map(|layer| layer.entity_instances.iter())
.collect()
})
.unwrap_or_default()
}
pub fn get_camera_bounds_of(level: &Level) -> CameraBounds {
CameraBounds {
left: 0.0,
top: level.px_hei as f32,
bottom: 0.0,
right: level.px_wid as f32,
}
}
pub fn get_active_level(&self) -> Option<&Level> {
self.active
.as_ref()
.and_then(|index| self.index.get(&index.map))
}
pub fn get_entities(&self) -> Vec<&EntityInstance> {
self.get_active_level()
.map(|level| MapQuery::get_entities_of(level))
.unwrap_or_default()
}
pub fn get_camera_bounds(&self) -> Option<CameraBounds> {
self.get_active_level().map(MapQuery::get_camera_bounds_of)
}
pub fn for_each_layer(&self, mut cb: impl FnMut(LayerRef)) {
if let Some(level) = self.get_active_level() {
Self::for_each_layer_of(level, cb);
}
}
}