Function updateVirtualJoystick

src/mobile/index.ts:85–167

(js: VirtualJoystick)

}

export function updateVirtualJoystick(js: VirtualJoystick): void {
  const screenW = getScreenWidth();
  const touchCount = getTouchCount();

  // If already active, check if our finger is still down
  if (js.active) {
    let stillActive = false;
    for (let i = 0; i < touchCount; i++) {
      const tx = getTouchX(i);
      const ty = getTouchY(i);
      if (i === js.touchIndex && tx !== 0 && ty !== 0) {
        stillActive = true;
        break;
      }
    }
    // Also check that the touch index is still within count
    if (js.touchIndex >= touchCount) {
      stillActive = false;
    }
    if (!stillActive) {
      js.active = false;
      js.touchIndex = -1;
      js.valueX = 0;
      js.valueY = 0;
      injectGamepadAxis(js.axisX, 0);
      injectGamepadAxis(js.axisY, 0);
      return;
    }
  }

  // Look for a new touch if not active
  if (!js.active) {
    for (let i = 0; i < touchCount; i++) {
      if (claimedTouches.has(i)) continue;
      const tx = getTouchX(i);
      const ty = getTouchY(i);
      if (tx === 0 && ty === 0) continue;

      // Check if touch is in the correct zone
      const inZone = js.zone === 'left' ? tx < screenW / 2 : tx >= screenW / 2;
      if (!inZone) continue;

      // PUBG-style: joystick origin appears at touch position
      js.active = true;
      js.touchIndex = i;
      js.originX = tx;
      js.originY = ty;
      js.handleX = tx;
      js.handleY = ty;
      claimedTouches.add(i);
      break;
    }
  }

  if (!js.active) return;

  claimedTouches.add(js.touchIndex);