Make SimpleAgent actually hunt others

src/agent.rs

@@ -119,12 +119,33 @@ fn random_move_within(
 impl Agent for SimpleAgent {
   fn next_move(&self, view: WorldView) -> Move {
     if view.self_id == view.tagged {
-      match view
-        .other_agents
-        .iter()
-        .find(|(dist, id)| dist.x.abs() <= 1 && dist.y.abs() <= 1 && Some(*id) != view.tagged_by)
-      {
-        Some((_, other)) => Move::TryTag(*other),
+      let mut cur = None;
+      for (dist, id) in view.other_agents {
+        if Some(id) == view.tagged_by {
+          continue;
+        }
+        if dist.x.abs() <= 1 && dist.y.abs() <= 1 {
+          cur = Some((id, 0, dist));
+          break;
+        }
+        let total_dist = dist.x.abs() + dist.y.abs();
+        let cur_dist = if let Some((_, dist, _)) = cur {
+          dist
+        } else {
+          isize::MAX
+        };
+        if total_dist < cur_dist {
+          cur = Some((id, total_dist, dist));
+        }
+      }
+      match cur {
+        Some((other, total_dist, dist)) => {
+          if total_dist == 0 {
+            Move::TryTag(other)
+          } else {
+            Move::TryMove((dist.x.signum(), dist.y.signum()).into())
+          }
+        }
         None => random_move_within(view.bounds_distance),
       }
     } else {

src/main.rs

@@ -63,6 +63,7 @@ fn main() {
       };
       world.do_step();
       gen += 1;
+      //std::thread::sleep(std::time::Duration::from_millis(500));
     }
   }
 }