1 files changed, 16 insertions, 0 deletions
diff --git a/Homework/cs5410/bbiy/src/systems/physics.js b/Homework/cs5410/bbiy/src/systems/physics.js
new file mode 100644
index 0000000..18c3cb3
--- /dev/null
+++ b/Homework/cs5410/bbiy/src/systems/physics.js
@@ -0,0 +1,16 @@
+game.system.Physics = () => {
+  const update = (elapsedTime, entities, changedIds) => {
+    for (let id in entities) {
+      const entity = entities[id];
+      if (entity.hasComponent("momentum") && entity.hasComponent("appearance")) {
+        const {dx, dy} = entity.components.momentum;
+        entity.components.position.x += dx * elapsedTime;
+        entity.components.position.y += dy * elapsedTime;
+        entity.components.position = clamp(entity.components.position, game.canvas.width - entity.components.appearance.width, game.canvas.height - entity.components.appearance.height);
+      }
+    }
+
+    return new Set();
+  };
+  return { update };
+};