let minLat;

let maxLat;

let minLong;

let maxLong;

​

// using preload function to optimize the program

​

function preload() {

  strings = loadStrings("airports.csv");

}

​

function setup() {

  createCanvas(600, 430);

  background(0);

​

  // condition for the program to stop if continuing doesn't make sense

  if (strings == null) {

    print("Failed to load the file, stopping here");

    while (true) {}

  }

​

  print(

    "Strings loaded from file successfully, read " + strings.length + " lines"

  );

  findMinMaxLatLong();

  noLoop(); // We only want to draw once.

}

​

function findMinMaxLatLong() {

  minLat = 0;

  maxLat = 0;

  minLong = 0;

  maxLong = 0;

​

  // for loop for finding max and min longitude & latitude

  for (let csvRowNumber = 1; csvRowNumber < strings.length; csvRowNumber++) {

    let singleRow = split(strings[csvRowNumber], ",");

    let longitude = float(singleRow[6]);

    let latitude = float(singleRow[7]);

​

    if (!isNaN(longitude) && !isNaN(latitude)) {

      if (latitude < minLat) minLat = latitude;

      if (latitude > maxLat) maxLat = latitude;

      if (longitude < minLong) minLong = longitude;

      if (longitude > maxLong) maxLong = longitude;

    }

  }

​

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

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

}

​

function draw() {

  for (let csvRowNumber = 1; csvRowNumber < strings.length; csvRowNumber++) {

    let singleRow = split(strings[csvRowNumber], ",");

    let longitude = float(singleRow[6]);

    let latitude = float(singleRow[7]);

​

    // Making sure that longitude and latitude coordinates exist

​

    if (!isNaN(longitude) && !isNaN(latitude)) {

      //Map function is used for calculating the coodinates x and y

​

      // Invert x-axis to match typical map orientation

​

      let x = map(longitude, minLong, maxLong, height, 0);

​

      let y = map(latitude, minLat, maxLat, 0, width);

​

      stroke(255);

​

      // changing x and y to match typical map orientation

​

      point(y, x);

    }

  }

​

  print("Finished drawing points.");

  noLoop(); // Stop drawing after one frame.

}

​