3 files changed, 60 insertions, 1 deletions
diff --git a/src/simulation/actions.js b/src/simulation/actions.js
new file mode 100644
index 0000000..40545c5
--- /dev/null
+++ b/src/simulation/actions.js
@@ -0,0 +1,28 @@
+'use strict';
+
+const threshold = 0.5;
+
+
+const move_forward = {
+  size: 1,
+  propose: (agent, head) => {
+    if (head[0] > threshold) {
+      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 [{
+        agent_changes: [{
+          agent_id: agent.id,
+          x: agent.x + dx,
+          y: agent.y + dy,
+        }],
+      }];
+    } else {
+      return [];
+    }
+  },
+};
+
+
+export const actions = [
+  move_forward,
+];
diff --git a/src/simulation/actions.test.js b/src/simulation/actions.test.js
new file mode 100644
index 0000000..a870352
--- /dev/null
+++ b/src/simulation/actions.test.js
@@ -0,0 +1,32 @@
+'use strict';
+
+import { actions } from './actions.js';
+
+
+const [move_forward, ...rest] = actions;
+
+
+test("move forward", () => {
+  const n = { id: 0, x: 0, y: 0, flags: { orientation: 'n' } };
+  const s = { id: 0, x: 0, y: 0, flags: { orientation: 's' } };
+  const e = { id: 0, x: 0, y: 0, flags: { orientation: 'e' } };
+  const w = { id: 0, x: 0, y: 0, flags: { orientation: 'w' } };
+
+  expect(move_forward.propose(n, [1])).toEqual([
+    { agent_changes: [{ agent_id: 0, x: 0, y: -1 }] },
+  ]);
+  expect(move_forward.propose(s, [1])).toEqual([
+    { agent_changes: [{ agent_id: 0, x: 0, y: 1 }] },
+  ]);
+  expect(move_forward.propose(e, [1])).toEqual([
+    { agent_changes: [{ agent_id: 0, x: 1, y: 0 }] },
+  ]);
+  expect(move_forward.propose(w, [1])).toEqual([
+    { agent_changes: [{ agent_id: 0, x: -1, y: 0 }] },
+  ]);
+
+  expect(move_forward.propose(n, [0])).toEqual([]);
+  expect(move_forward.propose(s, [-1])).toEqual([]);
+  expect(move_forward.propose(e, [0])).toEqual([]);
+  expect(move_forward.propose(w, [-1])).toEqual([]);
+});
diff --git a/src/simulation/senses.js b/src/simulation/senses.js
index bcfe9df..d2eb581 100644
--- a/src/simulation/senses.js
+++ b/src/simulation/senses.js
@@ -93,7 +93,6 @@ function vision_idx_to_world_pos(world, agent, idx) {
   const vx = idx % VIS_WIDTH;
   const vy = Math.floor(idx / VIS_WIDTH);
   const result = vision_pos_to_world_pos(world, agent, vx, vy);
-  console.log([agent.x, agent.y], vx, vy, result);
   return result;
 }