pianosnake

const EARTH_CIR_METERS = 40075016.686;

function toRadians(degrees) {
  return degrees * Math.PI / 180;
};

function degreeWidth(lat){
  return EARTH_CIR_METERS / 360 * Math.cos(toRadians(lat));
}

pianosnake

const EARTH_CIR_METERS = 40075016.686;

function toRadians(degrees) {
  return degrees * Math.PI / 180;
};

const metersToPixels = (meters, latitude, zoom) => {
  const metersPerPixel = EARTH_CIR_METERS / Math.pow(2, zoom + 8) * Math.cos(toRadians(latitude));
  return meters / metersPerPixel
}

pianosnake

// define window.sheetId sometime before loading this script. the sheet id is in the URL of the Google Sheet when you're editing it.
if(!window.sheetId) throw Error('window.sheetId required');


class DataProvider {
  constructor(sheetId) {
    this.sheetId = sheetId;
    this.dataPromises = {};
  }

pianosnake

const fs = require('fs');
const path = require('path');

function getMostRecentFile(dir) {
  const files = fs.readdirSync(dir);
  let earliestCreate = 0;
  let mostRecentFile = files[0];

  files.forEach(file => {
    if (fs.statSync(path.join(dir, file)).ctime > earliestCreate) {

pianosnake

const EARTH_CIR_METERS = 40075016.686;
const degreesPerMeter = 360 / EARTH_CIR_METERS;

function toRadians(degrees) {
  return degrees * Math.PI / 180;
};

function latLngToBounds(lat, lng, zoom, width, height){
  const metersPerPixelEW = EARTH_CIR_METERS / Math.pow(2, zoom + 8);
  const metersPerPixelNS = EARTH_CIR_METERS / Math.pow(2, zoom + 8) * Math.cos(toRadians(lat));

pianosnake

// adapted from http://mathforum.org/library/drmath/view/63767.html

const r = 6371.0072; //earth radius in KM

function toRadians(degrees) {
  return degrees * Math.PI / 180;
}; 

function computeArea(bbox){
  const [minLng, minLat, maxLng, maxLat] = bbox;

pianosnake

//divide 360 into 16 equal slices
const degrees = (new Array(16)).fill(null).map((x, i) => 360/16 * i + 11.25);
const directions = ['N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'WSW', 'W', 'WNW', 'NW', 'NNW'];

function cardinalDirection(bearing) {
  for (let i = 0, l = degrees.length; i < l; i++) {
    if (bearing < degrees[i]) return directions[i];
    if (i == l - 1) return directions[0];
  }
}

pianosnake

function insistentRequest(request, tryLimit){
  if(!tryLimit) return Promise.reject('tryLimit must be above 0');
  let tries = 0;

  return new Promise(function(resolve, reject){
    //create a generator object that repeatedly 'yields' the same promise until it succeeds or the try limit is reached
    const genObj = function* gen(){
      while(1){
        yield request()
          .then(resolve)

pianosnake

function throttlePromises(elements, asyncForEach, groupSize){
  return new Promise(function(resolve, reject){
    //create a generator object that 'yields' for every group
    const genObj = function* gen(){
      while(elements.length > 0){
        yield Promise.all(elements.splice(0, groupSize).map(asyncForEach))
          .then(() => genObj.next());
      }
      return resolve(true);
    }();

pianosnake

eslint "**/**.js" -f unix | perl -n -l -e '/(.*\.js):(\d*):/ && print "$1 $2"' | xargs -n 2 sh -c 'git blame $0 -L$1,$1'