don't rebuild the ground each step

1 files changed, 51 insertions, 0 deletions

diff --git a/src/systems/create.rs b/src/systems/create.rs
new file mode 100644
index 0000000..35ef747
--- /dev/null
+++ b/src/systems/create.rs
@@ -0,0 +1,51 @@
+
+use specs::{
+	Read,
+	Write,
+	WriteStorage,
+	System,
+	Join,
+	Entities,
+	LazyUpdate,
+	Builder
+};
+
+use crate::components::{New, Position};
+use crate::resources::{NewEntities};
+
+
+
+pub struct Create;
+impl <'a> System<'a> for Create {
+	type SystemData = (
+		Entities<'a>,
+		Write<'a, NewEntities>,
+		Read<'a, LazyUpdate>,
+		WriteStorage<'a, New>
+	);
+	
+	fn run(&mut self, (entities, mut new_entities, updater, mut new): Self::SystemData) {
+		{
+			let mut ents = Vec::new();
+			for (ent, _new) in (&entities, &new).join() {
+				ents.push(ent);
+			}
+			for ent in ents {
+				new.remove(ent);
+			}
+		}
+		for (pos, template) in &new_entities.templates {
+			let mut builder = updater.create_entity(&entities);
+			match new_entities.encyclopedia.construct(template) {
+				Ok(comps) => {
+					for comp in comps {
+						builder = comp.build(builder);
+					}
+					builder.with(Position::new(*pos)).with(New).build();
+				},
+				Err(msg) => {println!("{}", msg);}
+			}
+		}
+		new_entities.templates.clear();
+	}
+}