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Live stream data visualization HELP!

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- 06-Dec-2010 09:58 AM
- Forum: Programming Questions
Hi my class is working on visualizing data and I thought it would be really cool to do a live feed of a stock price. I am having trouble grabbing the live data part. Does anyone know how to help me extract data from yahoo finance? The graph is working but I dont know how to get the price off of the website.

http://finance.yahoo.com/q?s=cmg&ql=1

// Want to grab both price and time from yahoo finance

PFont f;

//Timer timer = new Timer (10000); --timer insteat

String[] ticker = {"CMG"}; //instead of ticker should i use "time"?

int counter = 0;

//int timer;

//initialize stock quote grabber to extract the stock price automatically from Yahoo finance webpage

StockQuoteGrabber SQ;

void setup() {

  size(500,300);

  //make StockQuoteGrabber object

  SQ = new StockQuoteGrabber(ticker[counter]);

  //Tell it to request CMG quote

  SQ.requestStockQuote();

  timer.start();

  f = createFont("Helectiva", 16, true);

}

void draw() {

  background(255);

  textFont(f);

  fill(0);

/* if (timer.isFinished()) {

   htmlRequest.makeRequest();

   println( "Making request!");

   timer.start(); */

   // Get the values to display

   String stockQuote = SQ.getStockQuote();

   int time = SQ.getTime(); //Get time of the stock price

   //Display everything

   //text(time[counter],10,160);

   //text("Click to display chart.", 10,180);

   //Draw graph based on CMG quote

   stroke(0);

   fill(175);

   rect(20,20,460,260);

   line(30,30,30,270);

   line(30,270,470,270);

   //point(time, stockQuote); //stockQuote not applicable?

  }

  void mousePressed() {

   //Increment the counter and get the stock quote (price) at the next point in time.

   counter = (counter + 1) % ticker.length;

   SQ.setTicker(ticker[counter]);

   //The data is requested again with a new point in time every time the mouse is pressed.

   SQ.requestStockQuote();

  }

//Here is my class:

//A StockQuoteGrabber class

class StockQuoteGrabber {



  int time = 0;

  String stockQuote = "";

  String ticker;



  StockQuoteGrabber(String timeTicker) {

   ticker = timeTicker;



  }



  // Set a new time

  void setTicker(String timeTicker) {

   ticker = timeTicker;

  }



  // Get the time

  int getTime() {

   return time;

  }



  // Get the Stock quote

  String getStockQuote() {

   return stockQuote;

  }



  // Make the XML request

  void requestStockQuote() {

   //Put XML source code into an array of strings

  String url = "http://finance.yahoo.com/q?s=cmg&ql=1";

  String[] lines = loadStrings(url);



  //Turn array into one long String

  String xml = join(lines, ""); //--> is it xml or html?



  //Searching for Stock quote (price)

  String lookfor = "Last Trade:</th><td class=";

  String end = "/";

  stockQuote = (giveMeTextBetween(xml, lookfor, end));



  // Searching for time

  lookfor = "Trade Time:</th><td class=";

   time = int(giveMeTextBetween (xml, lookfor, end));



  }



  // A function that returns a substring between two substrings

  String giveMeTextBetween(String s, String before, String after) {

   String found = "";

   int start = s.indexOf(before); // Find index of the beginning tag

   if (start == - 1) return""; // If we don't find anything, send back a blank String

   start += before.length(); // Move to the end of the beginning tag

   int end = s.indexOf(after, start); // Find the index of the end tag

   if (end == - 1) return""; // If we don't find the end tag, send back a blank string

   return s.substring(start, end);

  }

}

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