feat: scream when hedgehog is harshly thrown

apps/code/src/renderer/components/HedgehogMode.tsx

@@ -5,10 +5,15 @@ import type {
   HedgeHogMode as HedgehogModeGame,
 } from "@posthog/hedgehog-mode";
 import { logger } from "@utils/logger";
+import { playSoundUrl, WILHELM_SOUND_URL } from "@utils/sounds";
 import { useEffect, useRef } from "react";
 
 const log = logger.scope("hedgehog-mode");
 
+// Above the autonomous jump velocity of 15, so jumps never trigger.
+const HARSH_THROW_Y_THRESHOLD = 25;
+const HARSH_THROW_SPEED_THRESHOLD = 25;
+
 export function HedgehogMode() {
   const hedgehogMode = useSettingsStore((s) => s.hedgehogMode);
   const setHedgehogMode = useSettingsStore((s) => s.setHedgehogMode);
@@ -30,6 +35,27 @@ export function HedgehogMode() {
       | HedgehogActorOptions
       | undefined;
 
+    const onPointerUp = () => {
+      // Defer one frame so Matter.js applies the post-release velocity.
+      requestAnimationFrame(() => {
+        if (cancelled || !gameRef.current) return;
+        for (const hedgehog of gameRef.current.getAllHedgehogs()) {
+          const v = hedgehog.rigidBody?.velocity;
+          if (!v) continue;
+          const speed = Math.hypot(v.x, v.y);
+          if (
+            v.y < -HARSH_THROW_Y_THRESHOLD &&
+            speed > HARSH_THROW_SPEED_THRESHOLD
+          ) {
+            const volume = useSettingsStore.getState().completionVolume;
+            playSoundUrl(WILHELM_SOUND_URL, volume);
+            break;
+          }
+        }
+      });
+    };
+    window.addEventListener("pointerup", onPointerUp);
+
     import("@posthog/hedgehog-mode")
       .then(async ({ HedgeHogMode }) => {
         if (cancelled) return;
@@ -62,6 +88,7 @@ export function HedgehogMode() {
 
     return () => {
       cancelled = true;
+      window.removeEventListener("pointerup", onPointerUp);
     };
   }, [hedgehogMode, user?.hedgehog_config, setHedgehogMode]);
 

apps/code/src/renderer/utils/sounds.ts

@@ -13,6 +13,16 @@ import slideUrl from "@renderer/assets/sounds/slide.mp3";
 import switchUrl from "@renderer/assets/sounds/switch.mp3";
 import wilhelmUrl from "@renderer/assets/sounds/wilhelm.mp3";
 
+export const WILHELM_SOUND_URL = wilhelmUrl;
+
+export function playSoundUrl(url: string, volume = 80): void {
+  const audio = new Audio(url);
+  audio.volume = Math.max(0, Math.min(100, volume)) / 100;
+  audio.play().catch(() => {
+    // Audio play can fail if user hasn't interacted with the page yet
+  });
+}
+
 const SOUND_URLS: Record<Exclude<CompletionSound, "none">, string> = {
   guitar: guitarUrl,
   danilo: daniloUrl,