healing works now too, the first time based system

1 files changed, 43 insertions, 0 deletions

diff --git a/src/resources/ground.rs b/src/resources/ground.rs
new file mode 100644
index 0000000..b8c6b5a
--- /dev/null
+++ b/src/resources/ground.rs
@@ -0,0 +1,43 @@
+
+use std::collections::{HashMap, HashSet};
+
+use specs::{
+	ReadStorage,
+	Component,
+	Entity
+};
+
+use crate::{
+	components::{Visible, Removed},
+	Pos
+};
+
+#[derive(Default)]
+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>, removals: &'a ReadStorage<Removed>) -> Vec<&'a C> {
+		self.cells
+			.get(&pos)
+			.unwrap_or(&HashSet::new())
+			.iter()
+			.filter(|e| !removals.contains(**e))
+			.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
+	}
+}