2 files changed, 26 insertions, 10 deletions
diff --git a/src/engine/entities/FunctionBox.ts b/src/engine/entities/FunctionBox.ts
index 7493c8a..f381455 100644
--- a/src/engine/entities/FunctionBox.ts
+++ b/src/engine/entities/FunctionBox.ts
@@ -9,6 +9,7 @@ import {
   LambdaTerm,
   Modal,
   Pushable,
+  RadialObserve,
   Sprite,
 } from "../components";
 import { Coord2D } from "../interfaces";
@@ -40,6 +41,8 @@ export class FunctionBox extends Entity {
 
     this.addComponent(new Pushable());
 
+    this.addComponent(new RadialObserve());
+
     this.addComponent(new Grid(gridPosition));
 
     this.addComponent(
diff --git a/src/engine/entities/Piston.ts b/src/engine/entities/Piston.ts
index 18b761b..214eaac 100644
--- a/src/engine/entities/Piston.ts
+++ b/src/engine/entities/Piston.ts
@@ -1,5 +1,11 @@
 import { Entity, EntityNames } from ".";
-import { Colliding, ComponentNames, FacingDirection, Grid, RadialObserve } from "../components";
+import {
+  Colliding,
+  ComponentNames,
+  FacingDirection,
+  Grid,
+  RadialObserve,
+} from "../components";
 import { Game } from "../Game";
 import { Coord2D, Direction } from "../interfaces";
 
@@ -7,7 +13,7 @@ export class Piston extends Entity {
   constructor(gridPosition: Coord2D, direction: Direction) {
     super(EntityNames.Piston);
 
-    const radius = 1 + .001;
+    const radius = 1;
     this.addComponent(new RadialObserve(this.onObservation.bind(this), radius));
 
     this.addComponent(new FacingDirection(direction));
@@ -18,24 +24,31 @@ export class Piston extends Entity {
   }
 
   private onObservation(_game: Game, entity: Entity) {
-    const facingDirection = this.getComponent<FacingDirection>(ComponentNames.FacingDirection);
+    const facingDirection = this.getComponent<FacingDirection>(
+      ComponentNames.FacingDirection,
+    );
 
-    const myPosition = this.getComponent<Grid>(ComponentNames.Grid).gridPosition;
+    const myPosition = this.getComponent<Grid>(
+      ComponentNames.Grid,
+    ).gridPosition;
     const observingGrid = entity.getComponent<Grid>(ComponentNames.Grid);
     const observingPosition = observingGrid.gridPosition;
 
-    const [dx, dy] = [myPosition.x - observingPosition.x, myPosition.y - observingPosition.y].map(x => Math.round(x));
+    const [dx, dy] = [
+      myPosition.x - observingPosition.x,
+      myPosition.y - observingPosition.y,
+    ].map((x) => Math.round(x));
     const v: Record<typeof dx, Record<typeof dy, Direction>> = {
       [-1]: {
-	[dy]: Direction.RIGHT,
+        [dy]: Direction.RIGHT,
       },
       [1]: {
-	[dy]: Direction.LEFT,
+        [dy]: Direction.LEFT,
       },
       [0]: {
-	[-1]: Direction.UP,
-	[1]: Direction.DOWN,
-      }
+        [-1]: Direction.UP,
+        [1]: Direction.DOWN,
+      },
     };
 
     if (facingDirection.currentDirection !== v[dx][dy]) {