add trigger action

1 files changed, 19 insertions, 1 deletions

diff --git a/src/simulation/actions.js b/src/simulation/actions.js
index 8a4e8f0..dd7c4e6 100644
--- a/src/simulation/actions.js
+++ b/src/simulation/actions.js
@@ -97,8 +97,26 @@ const place = {
 };
 
 
+const trigger = {
+  size: 1,
+  propose: (world, agent, head) => {
+  if (head[0] < threshold) { return []; }
+    else {
+      const dx = { n: 0, e: 1, s: 0, w: -1 }[agent.flags.orientation];
+      const dy = { n: -1, e: 0, s: 1, w: 0 }[agent.flags.orientation];
+      return [
+        { lattice_changes: [{
+          x: agent.x + dx, y: agent.y + dy,
+          from: 'mutable', to: 'active',
+          flags: { emit: [1, 0, 0, 0, 0, 0, 0, 0] },
+        }]}
+      ];
+    }
+  },
+};
 
 
 export const actions = [
-  move_forward, move_backward, turn_left, turn_right, place,
+  move_forward, move_backward, turn_left, turn_right, 
+  place, trigger,
 ];