import processing.xml.*;

//xml element to store and load yahoo pipes information
XMLElement pipes;


String pipeURL = new String("http://pipes.yahoo.com/pipes/pipe.run?_id=a135e8a8730f782fb817d792298562a4&_render=rss"); // location of yahoo pipes XML file or rss feed
void setup(){
  size(360,180); // this size directly relates to longatude and latitude
  smooth(); // turn smoothing on
  background(255); // clear the window

  pipes = new XMLElement(this, pipeURL);// make a new XML object for loading a XML file


  initPipes(); // instilize pipes

}

//go through yahoo rss feed and collect all of it's data
void initPipes(){


  XMLElement pipe;
  XMLElement item;
  XMLElement data;


  //Strings used for matching speific daa in the incomming XML file..	
  String matchLat = "geo:lat";
  String matchLong = "geo:long";
  String matchTitle = "title";

  // position and size of our earthquaes
  float longX = 0;
  float latY = 0;
  float magnitude = 0;

  //go through each item in the Yahoo Pipes XML file
  //all information is stored in a item data structure with information about the XML file also being returned as an item.
  /*
<item1>
   </item1>
   <item2>
   </item2>
   <item3>
   </item3>
   */
  for(int i = 0; i < pipes.getChild(0).getChildCount();i++){
    item = pipes.getChild(0).getChild(i); // item will hold one item from the XML file

    for(int e = 0; e < item.getChildCount();e++){ // go through each child item in the item //title ge:lat etc
      data = item.getChild(e); // data is stored as a item in yahoo pipes and not a attribute, if we are at the correct item collect it's information

      if(matchTitle.equals(data.getName()) == true)
        magnitude = float(data.getContent());


      if(matchLat.equals(data.getName()) == true)
        latY = float(data.getContent());

      if(matchLong.equals(data.getName()) == true)
        longX = float(data.getContent());

    }

    if(longX != 0 & latY != 0){ // if we do not have coordinate data both lat and long will be set to 0 so we don't draw
      noStroke();
      fill(50,50,map(magnitude,2.5,4,0,255),50); // calculate a fill colour based on earthquake magnitude
      ellipse( longX + 180, (height - (latY + 90)), map(magnitude,2.5,6,0,30) , map(magnitude,2.5,6,0,30)); 
      //draw a ellipse earthquake coordinates,two things to note because the world is round and not flat we have flatterned our coordinated
      //we have done this by converting longitude (the angular measurement ranging from 0° at the prime meridian to +180° eastward and −180° westward) directly to a X coordinate
      // and latitude the directly to a y coordinate
      println("latY: "+(latY +90)+ " longX: "+(longX+180)+ " magnitude: "+(magnitude));

    }

  }


}