1 files changed, 44 insertions, 1 deletions
diff --git a/src/simulation/actions.js b/src/simulation/actions.js
index 6497917..78345ce 100644
--- a/src/simulation/actions.js
+++ b/src/simulation/actions.js
@@ -22,6 +22,7 @@ const move_forward = {
   },
 };
 
+
 const move_backward = {
   size: 1,
   propose: (world, agent, head) => {
@@ -202,7 +203,49 @@ const take_flag = {
 };
 
 
+const drop_flag = {
+  size: 1,
+  propose: (world, agent, head) => {
+    if (head[0] < threshold) { return []; }
+    else if (!agent.flags.flag) { 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: 'empty', to: 'flag',
+            flags: { emit: [ 0, 0, -1, 0, 0, 0, 0, 0 ] },
+          }],
+          agent_changes: [{
+            agent_id: agent.id,
+            flags: { flag: false },
+          }],
+        }
+      ];
+    }
+  },
+};
+
+
+const speak = {
+  size: 8,
+  propose: (world, agent, head) => {
+    return [
+      {
+        agent_changes: [{
+          agent_id: agent.id,
+          flags: { emit: head },
+        }],
+      },
+    ];
+  },
+};
+
+
 export const actions = [
   move_forward, move_backward, turn_left, turn_right, 
-  place, trigger, pretend_frozen, unfreeze, take_flag,
+  place, trigger, pretend_frozen, unfreeze, take_flag, drop_flag,
+  speak,
 ];