@pnext/three-loader/src/utils/utils.ts

Potree loader for ThreeJS, converted and adapted to Typescript.

import { IPointCloudTreeNode } from '../types';

export function getIndexFromName(name: string) {
  return parseInt(name.charAt(name.length - 1), 10);
}

/**
 * When passed to `[].sort`, sorts the array by level and index: r, r0, r3, r4, r01, r07, r30, ...
 */
export function byLevelAndIndex(a: IPointCloudTreeNode, b: IPointCloudTreeNode) {
  const na = a.name;
  const nb = b.name;
  if (na.length !== nb.length) {
    return na.length - nb.length;
  } else if (na < nb) {
    return -1;
  } else if (na > nb) {
    return 1;
  } else {
    return 0;
  }
}

export function handleFailedRequest(response: Response): Response {
  if (response.status !== 200) {
    throw Error('Response error');
  }
  return response;
}

export function handleEmptyBuffer(buffer: ArrayBuffer) {
  if (!buffer || buffer.byteLength === 0) {
    throw Error('Empty buffer');
  }
  return buffer;
}