Added sample 11 for chapter 18

Author: jurisgalang

chapter_18/11_yahoo_search_visualization.rb

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+#
+# Example 18-11: Yahoo search visualization
+#
+load_library "pyahoo"
+import "pyahoo"
+
+# The names to search
+NAMES = %w{ Aliki Cleopatra Penelope Daniel Peter }
+
+def setup
+  size 500, 300
+  text_font create_font("Georgia", 20, true)
+  smooth
+  
+  # Search for all names
+  # The search() function is called for each name in the array.
+  @yahoo = []
+  NAMES.each do |name|
+    # Create a YahooSearch object. 
+    # You have to pass in the API key given to you by Yahoo.
+    @yahoo << YahooSearch.new(self, "YOUR API KEY HERE")
+    @yahoo.last.search(name)
+  end
+  
+  @bubbles     = { }
+  @search_count = 0
+end
+
+def draw
+  background 255
+
+  # poll all yahoo searches
+  @yahoo.each do |yahoo|
+    search_event(yahoo) if yahoo.available?
+  end
+
+  # Show all bubbles
+  @bubbles.values.each do |bubble|
+    bubble.display
+  end
+end
+
+def search_event(yahoo)
+  # Total # of results for each search
+  # getTotalResultsAvailable() returns the total number of web pages that Yahoo found containing the search phrase. 
+  # These numbers can be quite large so they are scaled down before being used as an ellipse size.
+  total = yahoo.get_total_results_available
+  
+  # Scale down the number so that it can be viewable
+  r = sqrt(total) / 75.0
+  
+  # Make a new bubble object
+  # The search data is used to make a Bubble object for the visualization.
+  search = yahoo.get_search_string
+  return if @bubbles.has_key? search
+  
+  b = Bubble.new(search, r, 50 + @search_count * 100, $app.height / 2)
+  @bubbles[search] = b
+  @search_count   += 1
+end
+
+#
+#  Simple "Bubble" class to represent each search
+#
+class Bubble
+  def initialize(search, r, x, y)
+    @search = search
+    @r = r
+    @x = x
+    @y = y    
+  end
+  
+  def display
+    $app.stroke 0
+    $app.fill 0, 50
+    $app.ellipse @x, @y, @r, @r
+    $app.text_align PApplet::CENTER
+    $app.fill 0
+    $app.text @search, @x, @y
+  end
+end