Function parseOptionalGestureCenter

src/core/dispatch-interactions.ts:995–1010

(
  xInput: string | undefined,
  yInput: string | undefined,
)

}

function parseOptionalGestureCenter(
  xInput: string | undefined,
  yInput: string | undefined,
): Pick<RotateGestureParams, 'x' | 'y'> {
  if (xInput === undefined && yInput === undefined) return {};
  if (xInput === undefined || yInput === undefined) {
    throw new AppError('INVALID_ARGS', 'gesture rotate center requires both x and y');
  }

  const x = Number(xInput);
  const y = Number(yInput);
  if (!Number.isFinite(x) || !Number.isFinite(y)) {
    throw new AppError('INVALID_ARGS', 'gesture rotate center requires finite x and y');
  }
  return { x, y };
}

function parseGestureDirection(input: string | undefined, field: string): ScrollDirection {
  return parseStringMember(SCROLL_DIRECTIONS, input, {