// https://github.com/pierredavidbelanger/ekmeans/blob/master/McDonald's%20Europe.csv

​

strings = [];

let minLat;

let maxLat;

let minLong;

let maxLong;

​

function preload() {

  strings = loadStrings("mcdeurope.csv");

}

function setup() {

  createCanvas(600, 400);

  background(220);

​

  if (strings == null) {

    print("Failed to load file."); // checking if file loaded

    while (true) {}

  }

  print("Loaded " + strings.length + " lines successfully");

​

  getMinMaxLatLong();

}

​

function getMinMaxLatLong() {

  let singleRow = [];

  for (let mcdRowNumber = 0; mcdRowNumber < strings.length; mcdRowNumber++) {

    singleRow = split(strings[mcdRowNumber], ",");

    let latitude = float(singleRow[0]); // first is latitude

    let longitude = float(singleRow[1]); // second is longitude

​

    if (isNaN(longitude) || isNaN(latitude)) {

      // make sure they are numbers

      print("Conversion to float failed; Skipping row " + mcdRowNumber);

    } else {

      if (mcdRowNumber == 0) {

        // very interesting observation, by changing the initial values of min and max of the lat and long, the entire visualization shifts, why?

        minLat = -20;

        maxLat = 30;

        minLong = 20;

        maxLong = 70;

      }

      minLat = min(minLat, latitude);

      maxLat = max(maxLat, latitude);

      minLong = min(minLong, longitude);

      maxLong = max(maxLong, longitude);

    }

    let xpos = map(longitude, minLong, maxLong, 0, width);

    let ypos = map(latitude, minLat, maxLat, height, 0);

    stroke(3);

    point(xpos, ypos);

  } // end of for loop

​

  //inaccurate with the extreme values

  //print("Latitude (min, max) = (" + minLat + "," + maxLat + ") ");

  //print("Longitude (min, max) = (" + minLong + "," + maxLong + ")");

​

  print("Finished.");

} // end of findMinMaxLatLong

​