1 files changed, 24 insertions, 0 deletions
diff --git a/src/game/utils.ts b/src/game/utils.ts
new file mode 100644
index 0000000..ec81419
--- /dev/null
+++ b/src/game/utils.ts
@@ -0,0 +1,24 @@
+import { Ball } from "../state";
+import { VELOCITY_SCALING_FACTOR } from "./const";
+
+export const applyBallVelocity = (ball: Ball): Ball => {
+  let newPos = ball.position.map(
+    (a, i) => a + ball.velocity[i] * VELOCITY_SCALING_FACTOR
+  ) as [number, number];
+  return { ...ball, position: newPos };
+};
+
+export const applyBallBounce = (ball: Ball, normal: [number, number]): Ball => {
+  //calculate reflection
+  const newVelocity = ball.velocity.map(
+    (v, i) => v - v * Math.abs(normal[i]) * 2
+  ) as [number, number];
+
+  //move the ball out of the collider
+  const newPos = ball.position.map((p, i) => p + normal[i]) as [number, number];
+
+  //this gives a little punch
+  let newBall = { velocity: newVelocity, position: newPos };
+  newBall = applyBallVelocity(newBall);
+  return newBall;
+};