the mess that is pushable

src/bootstrap.js

@@ -6,7 +6,7 @@ game.bootstrap = (() => {
     { 
       src: [
         'src/components/position.js', 'src/components/momentum.js', 'src/components/gridPosition.js',
-        'src/components/appearence.js', 'src/components/controllable.js'
+        'src/components/appearence.js', 'src/components/controllable.js', 'src/components/pushable.js',
       ],
       id: 'components'
     },

src/components/pushable.js

@@ -0,0 +1 @@
+game.components.Pushable = () => game.Component('pushable');

src/game.js

@@ -29,6 +29,7 @@ game.initialize = () => {
   Array(400).fill(null).forEach((_, i) => {
     const bigBlue = game.createBigBlue();
     bigBlue.addComponent(game.components.GridPosition({x: Math.floor(Math.random() * 15), y: Math.floor(Math.random() * 13)}));
+		bigBlue.addComponent(game.components.Pushable());
     game.entities[bigBlue.id] = bigBlue;
   });
 
@@ -36,6 +37,7 @@ game.initialize = () => {
   game.rock.addComponent(game.components.Position({x: 200, y: 200}));
   game.rock.addComponent(game.components.GridPosition({x: 0, y: 0}));
   game.rock.addComponent(game.components.Controllable({controls: ['left', 'right', 'up', 'down']}));
+	game.rock.addComponent(game.components.Pushable());
   game.entities[game.rock.id] = game.rock;
 
   lastTimeStamp = performance.now()

src/systems/gridSystem.js

@@ -52,6 +52,16 @@ game.system.GridSystem = ({ xDim, yDim, canvasWidth, canvasHeight }) => {
           });
 
           // TODO: Loop in momentum direction until we find an entity that does not have "push" component
+          const proposed = {x: entity.components.gridPosition.x + momentumVector.dx, y: entity.components.gridPosition.y + momentumVector.dy}
+					
+					const entitiesInCell = entitiesGrid[proposed.x][proposed.y];
+
+					for (let id in entitiesInCell) {
+						if (entitiesInCell[id].hasComponent("pushable")) {
+							entitiesInCell[id].addComponent(game.components.Momentum({...momentumVector}));
+						}
+					} 
+
           entity.components.gridPosition.x = entity.components.gridPosition.x + momentumVector.dx;
           entity.components.gridPosition.y = entity.components.gridPosition.y + momentumVector.dy;