1 files changed, 22 insertions, 2 deletions
diff --git a/src/resources.rs b/src/resources.rs
index 6e4bffb..0e9a1e3 100644
--- a/src/resources.rs
+++ b/src/resources.rs
@@ -1,6 +1,6 @@
 
 use std::collections::{HashMap, HashSet};
-use specs::Entity;
+use specs::{Entity, ReadStorage, Component};
 
 use crate::{
 	pos::Pos,
@@ -11,7 +11,8 @@ use crate::{
 	PlayerId,
 	RoomId,
 	util::Result,
-	template::Template
+	template::Template,
+	components::Visible
 };
 
 
@@ -40,6 +41,25 @@ pub struct Spawn {
 pub struct Ground {
 	pub cells: HashMap<Pos, HashSet<Entity>>
 }
+impl Ground {
+	pub fn components_on<'a, C: Component>(&self, pos: Pos, component_type: &'a ReadStorage<C>) -> Vec<&'a C> {
+		self.cells.get(&pos).unwrap_or(&HashSet::new()).iter().filter_map(|e| component_type.get(*e)).collect()
+	}
+	
+	pub fn by_height(&self, pos: &Pos, visibles: &ReadStorage<Visible>, ignore: &Entity) -> Vec<Entity> {
+		let mut entities: Vec<Entity> = self.cells
+			.get(&pos).unwrap_or(&HashSet::new())
+			.iter()
+			.cloned()
+			.filter(|e| e != ignore && visibles.contains(*e))
+			.collect();
+		entities.sort_by(|a, b|
+			visibles.get(*b).unwrap().height.partial_cmp(&visibles.get(*a).unwrap().height).unwrap()
+		);
+		entities
+	}
+}
+
 
 #[derive(Default)]
 pub struct NewEntities {