added flags component, and conditions for building

1 files changed, 13 insertions, 1 deletions

diff --git a/src/resources/ground.rs b/src/resources/ground.rs
index a5f4c00..8194a44 100644
--- a/src/resources/ground.rs
+++ b/src/resources/ground.rs
@@ -8,7 +8,7 @@ use specs::{
 };
 
 use crate::{
-	components::{Visible, Removed},
+	components::{Visible, Removed, Flags, Flag},
 	Pos
 };
 
@@ -28,6 +28,15 @@ impl Ground {
 			.collect()
 	}
 	
+	pub fn all_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())
@@ -41,4 +50,7 @@ impl Ground {
 		entities
 	}
 	
+	pub fn flags_on<'a>(&self, pos: Pos, flags: &'a ReadStorage<Flags>) -> HashSet<Flag> {
+		self.all_components_on::<Flags>(pos, flags).into_iter().fold(HashSet::new(), |a, b| &a | &b.0)
+	}
 }