NPCs do not follow forever. We add a max_turns constant to limit foll…

…owing
rpruizc · Sep 12, 2020 · 5798eb5 · 5798eb5
1 parent 2af0af9
commit 5798eb5
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/src/behaviour.rs b/src/behaviour.rs
@@ -13,11 +13,15 @@ use grid_search_cardinal::{
 use line_2d::LineSegment;
 use shadowcast::{vision_distance, VisionDistance};
 
-pub struct Agent {}
+pub struct Agent {
+    turns_since_last_saw_player: u32,
+}
 
 impl Agent {
     pub fn new() -> Self {
-        Self {}
+        Self {
+            turns_since_last_saw_player: u32::MAX,
+        }
     }
 
     // Chooses an action for an NPC to take
@@ -40,6 +44,12 @@ impl Agent {
         let npc_coord = world.entity_coord(entity).expect("npc has no coord");
         let player_coord = world.entity_coord(player).expect("player has no coord");
         if !npc_has_line_of_sight(npc_coord, player_coord, world) {
+            self.turns_since_last_saw_player = 0;
+        } else {
+            self.turns_since_last_saw_player = self.turns_since_last_saw_player.saturating_add(1);
+        }
+        const MAX_TURNS_TO_CHASE_PLAYER_AFTER_LOSING_SIGHT: u32 = 3;
+        if self.turns_since_last_saw_player > MAX_TURNS_TO_CHASE_PLAYER_AFTER_LOSING_SIGHT {
             return NpcAction::Wait;
         }
         const SEARCH_DISTANCE: u32 = 5;