PFont f;

float WIDTH = 1280;
float HEIGHT = 720;
float MARGIN = 50;

float MIN_LONG = 22;
float MAX_LONG = 50;

float MIN_LAT = -128;
float MAX_LAT = -67;

String[] zips;
int zipNb;

float oldLong, oldLat, newLong, newLat;
String firstDigits="01";

color c = color(random(0,255),random(0,255),random(0,255));

void setup(){
  size(1280, 720);
  frameRate(10000);
  strokeWeight(1);

  zips = loadStrings("zips.txt");
  zipNb = 1;
  background(255);

  f = createFont("Calibri", 42);
  textFont(f);
}

void draw(){
  //background(255);

  boolean connect = true;

  String[] zip = zips[zipNb].split("");
  String firstTwoDigits = zip[0]+zip[1];
  if(!firstTwoDigits.equals(firstDigits)){
    c = color(random(0,255),random(0,255),random(0,255));
    connect = false;
    firstDigits = firstTwoDigits;
  }

  connectZip(zipNb, connect);

  zipNb+=1;

  if(zipNb % 20 == 0){
    // Save frame every 20 frames
    //saveFrame("movie/######.png");
  }
}

void connectZip(int nb, boolean connect){

  if(nb>zips.length-1) exit();

  //println(zips[nb]);
  String[] zip = zips[nb].split("\t");
  fill(255);
  stroke(255);
  rect(25,0,150,50);
  noStroke();
  fill(0);

  newLong = Float.parseFloat(zip[1]);
  newLat = Float.parseFloat(zip[2]);

  //print(newLong + "," + newLat);
  if(connect){
    drawLine(oldLong, oldLat, newLong, newLat);

    double length = Math.sqrt( Math.pow(newLong-oldLong,2) + Math.pow(newLat-oldLat,2) );
    if(length > 10) println(zip);
  }else{
    drawLine(newLong, newLat, newLong, newLat);
  }

  oldLong = newLong;
  oldLat = newLat;

}


void drawLine(float long1, float lat1, float long2, float lat2){
  // Plot line on the graph

  if(long1<MIN_LONG || lat1<MIN_LAT) return;
  if(long1>MAX_LONG || lat1>MAX_LAT) return;

  Point startPoint = mapPoint(long1, lat1);
  Point endPoint = mapPoint(long2, lat2);

  stroke(c);
  line(startPoint.x, startPoint.y, endPoint.x, endPoint.y);

}

Point mapPoint(float longitude, float latitude){
  // Converts a longitude-latitude pair into A,Y coords on the canvas

  float spanX = (HEIGHT-MARGIN*2) / (MAX_LONG-MIN_LONG);
  float spanY = (WIDTH-MARGIN*2) / (MAX_LAT-MIN_LAT);

  float y = HEIGHT - (MARGIN + spanX * (longitude - MIN_LONG));
  float x = MARGIN + spanY * (latitude - MIN_LAT);

  return new Point(x, y);
}

class Point{
  public float x, y;

  Point(float x, float y){
    this.x = x;
    this.y = y;
  }
}