Learning Processing: A Beginner's Guide to Programming Images ...

340 Learning Processing
18.5
Exercise 18-8: Expand Example 18-5 to also search for the next day’s high and low temperature.
Exercise 18-9: Take a look at Yahoo’s “ Word of the Day ” XML feed available at this URL:
http://xml.education.yahoo.com/rss/wotd/ . Use the manual parsing techniques to pull out the
Word of the Day from the feed.
Text Analysis
Loading text from a URL need not only be an exercise in parsing out small bits of information. It is
possible with Processing to analyze large amounts of text found on the web from news feeds, articles, and
speeches, to entire books. A nice source is Project Gutenberg ( http://www.gutenberg.org/ ) —which makes
available thousands of public domain texts. Algorithms for analyzing text merits an entire book itself, but
we will look at one simple beginner example here.
Example 18-6 retrieves the entire text of Shakespeare’s play King Lear , and uses split Tokens ( ) to make
an array of all the words in the play. Th e sketch then displays the words one by one, along with a count of
how many times the word appears in the text.
Example 18-6: Analyzing King Lear
PFont f; // A variable to hold onto a font
String[] kinglear; // The array to hold all of the text
int counter = 0; // Where are we in the text
// We will use spaces and punctuation as delimiters
String delimiters = " ,.?!;: " ;
void setup() {
size(200,200);
// Load the font
f = loadFont( " Georgia-Bold-16.vlw " );
// Load King Lear into an array of strings
String url = " http://www.gutenberg.org/dirs/etext97/1ws3310.txt " ;
String[] rawtext = loadStrings(url);
// Join the big array together as one long string
String everything = join(rawtext, " " );
// Split the array into words using any delimiter
kinglear = splitTokens(everything,delimiters);
frameRate(5);
}
void draw() {
background(255);
// Pick one word from King Lear
String theword = kinglear[counter];
// Count how many times that word appears in King Lear
int total = 0;
Any punctuation is used as a delimiter.
All the lines in King Lear are
fi rst joined as one big String
and then split up into an array of
individual words. Note the use
of splitTokens() since we are
using spaces and punctuation
marks all as delimiters.
This loop counts the
number of occurrences
of the current word being
displayed.