Re-adding Topics to SVN

java/examples/Topics/Advanced Data/HashMapClass/HashMapClass.pde

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+/**
+ * HashMap example
+ * by Daniel Shiffman.  
+ * 
+ * This example demonstrates how to use a HashMap to store 
+ * a collection of objects referenced by a key.
+ * This is much like an array, only instead of accessing elements
+ * with a numeric index, we use a String.
+ * If you are familiar with associative arrays from other languages,
+ * this is the same idea.
+ *
+ * This example uses the HashMap to perform a simple concordance
+ * http://en.wikipedia.org/wiki/Concordance_(publishing)
+ */
+
+
+HashMap words;  // HashMap object
+
+String[] tokens;  // Array of all words from input file
+int counter;
+
+PFont f;
+
+void setup() {
+  size(640, 360);
+  words = new HashMap();
+
+  // Load file and chop it up
+  String[] lines = loadStrings("dracula.txt");
+  String allText = join(lines, " ");
+  tokens = splitTokens(allText, " ,.?!:;[]-");
+  f = createFont("Georgia", 36, true);  
+}
+
+void draw() {
+  background(51);
+  fill(255);
+  
+  // Look at words one at a time
+  String s = tokens[counter];
+  counter = (counter + 1) % tokens.length;
+
+  // Is the word in the HashMap
+  if (words.containsKey(s)) {
+    // Get the word object and increase the count
+    // We access objects from a HashMap via its key, the String
+    Word w = (Word) words.get(s);
+    w.count(); 
+  } else {
+    // Otherwise make a new word
+    Word w = new Word(s);
+    // And add to the HashMap
+    // put() takes two arguments, "key" and "value"
+    // The key for us is the String and the value is the Word object
+    words.put(s, w);    
+  }
+
+  // Make an iterator to look at all the things in the HashMap
+  Iterator i = words.values().iterator();
+
+  // x and y will be used to locate each word
+  float x = 0;
+  float y = height-10;
+
+  while (i.hasNext()) {
+    // Look at each word
+    Word w = (Word) i.next();
+    
+    // Only display words that appear 3 times
+    if (w.count > 3) {
+      // The size is the count
+      int fsize = constrain(w.count, 0, 100);
+      textFont(f, fsize);
+      text(w.word, x, y);
+      // Move along the x-axis
+      x += textWidth(w.word + " ");
+    }
+    
+    // If x gets to the end, move Y
+    if (x > width) {
+      x = 0;
+      y -= 100;
+      // If y gets to the end, we're done
+      if (y < 0) {
+        break; 
+      }
+    }
+  } 
+}

java/examples/Topics/Advanced Data/HashMapClass/Word.pde

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+class Word {
+  
+  int count;
+  String word;
+  
+  Word(String s) {
+    word = s;
+    count = 1;
+  }
+  
+  void count() {
+    count++;
+  }
+
+}