updating chapter 18 examples

Author: jashkenas

chapter_18/01_user_input.rb

@@ -3,9 +3,8 @@
 #
 def setup
   size 300, 200
-  @typing = ""
-  @saved  = ""
-  textFont createFont "Arial", 16, true # set the font for text
+  @typing, @saved = "", ""
+  text_font create_font "Arial", 16, true # set the font for text
 end
 
 def draw
@@ -28,6 +27,6 @@ def keyPressed
     # Otherwise, concatenate the String
     # Each character typed by the user is added to the 
     # end of the String variable.
-    @typing = @typing + key 
+    @typing = @typing + key if key.is_a? String 
   end
 end

chapter_18/02_graphing_comma_separated_numbers_from_a_text_file.rb

@@ -4,11 +4,12 @@
 def setup
   size 200, 200
   # The text from the file is loaded into an array. 
-  stuff = load_strings("data-1.txt")
+  stuff = File.readlines("#{sketch_path}/data/data-1.txt")
 
   # This array has one element because the file only has one line. 
   # Convert String into an array of integers using ',' as a delimiter
-  @data = int(split(stuff.first, ","))
+  @data = stuff.first.split(',')
+  @data.map! {|num| num.to_i }
 end
 
 def draw

chapter_18/03_creating_object_from_a_text_file.rb

@@ -6,14 +6,14 @@ def setup
   smooth
 
   # Load text file as an array of Strings
-  data = load_strings("data-2.txt")
+  data = File.readlines("#{sketch_path}/data/data-2.txt")
 
   # The size of the array of Bubble objects is determined by the 
   # total number of lines in the text file.
   @bubbles = []
   data.each do |datum|
     # Each line is split into an array of floating point numbers.
-    values = float(split(datum, "," )) 
+    values = datum.split(',').map {|d| d.to_f }
     # The values in the array are passed into the Bubble class constructor.
     @bubbles << Bubble.new(*values)
   end
@@ -35,10 +35,8 @@ class Bubble
   # The constructor initializes color and size
   # Location is filled randomly
   def initialize(r, g, diameter)
-    @x        = $app.random($app.width)
-    @y        = $app.height
-    @r        = r
-    @g        = g
+    @x, @y    = $app.random($app.width), $app.height
+    @r, @g    = r, g
     @diameter = diameter
   end
 
@@ -53,8 +51,6 @@ def display
   def drift
     @y += $app.random(-3, -0.1)
     @x += $app.random(-1, 1)
-    if @y < -@diameter * 2
-      @y = $app.height + @diameter * 2 
-    end
+    @y = $app.height + @diameter * 2 if @y < -@diameter * 2
   end
 end

chapter_18/04_loading_and_saving_data_to_text_file.rb

@@ -4,16 +4,17 @@
 def setup
   size 200, 200
   smooth
+  @file_path = "#{sketch_path}/data/data-2.txt"
 
   # Load text file as an array of Strings
-  data = load_strings("data-2.txt")
+  data = File.readlines(@file_path)
 
   # The size of the array of Bubble objects is determined by the 
   # total number of lines in the text file.
   @bubbles = []
   data.each do |datum|
     # Each line is split into an array of floating point numbers.
-    values = float(split(datum, ","))
+    values = datum.split(',').map {|num| num.to_f }
     # The values in the array are passed into the Bubble class constructor.
     @bubbles << Bubble.new(*values)
   end
@@ -48,7 +49,7 @@ def save_data
 
   # Save to File
   # The same file is overwritten by adding the data folder path to saveStrings().
-  save_strings("data/data-2.txt", data)
+  File.open(@file_path, 'w') {|file| file.write(data.join("\n")) }
 end
 
 #

chapter_18/05_parsing_yahoos_xml_weather_feed_manually.rb

@@ -3,7 +3,7 @@
 #
 def setup
   size 200, 200
-  textFont createFont("Georgia",16, true)
+  text_font create_font("Georgia",16, true)
 
   # Make a WeatherGrabber object
   @counter = 0
@@ -73,7 +73,7 @@ def request_weather
 
     # Searching for temperature
     lookfor      = "temp=\""
-    @temperature = $app.int(give_me_text_between(xml, lookfor, endmarker))
+    @temperature = give_me_text_between(xml, lookfor, endmarker).to_i
   end
 
   # A function that returns a substring between two substrings

chapter_18/06_analyzing_king_lear.rb

@@ -5,7 +5,7 @@ def setup
   size 200, 200
 
   # Load the font
-  textFont loadFont("Georgia-Bold-16.vlw")
+  text_font load_font("Georgia-Bold-16.vlw")
 
   # Where are we in the text (start later b/c Project Gutenberg has 
   # licensing info at beginning)
@@ -20,12 +20,12 @@ def setup
 
   # All the lines in King Lear are first 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 
+  # Note the use of split() since we are using spaces and 
   # punctuation marks all as delimiters.  
-  delimiters = " ,.?!;:[]"
-  @kinglear  = split_tokens(everything, delimiters)
+  delimiters = /[ ,.?!;:\[\]]/
+  @kinglear  = everything.split(delimiters)
 
-  frameRate 5
+  frame_rate 5
 end
 
 def draw

chapter_18/07_loading_a_url_with_simpleml.rb

@@ -12,8 +12,8 @@ def setup
 
   # Create and make an asynchronous request using
   # the Request object from the library
-  @htmlRequest = HTMLRequest.new(self, "http://www.yahoo.com")
-  @htmlRequest.makeRequest
+  @request = HTMLRequest.new(self, "http://www.yahoo.com")
+  @request.makeRequest
   @timer = Timer.new(5000)
   @timer.start
   background 0
@@ -25,7 +25,7 @@ def draw
   # A request is made every 5s. 
   # The data is not received here, however, this is only the request.  
   if @timer.finished?
-    @htmlRequest.makeRequest
+    @request.make_request
     # XXX: was println("Making request!");
     puts "Making request!" 
     @timer.start
@@ -34,10 +34,10 @@ def draw
   # When a request is finished the data the available 
   # flag is set to true - and we get a chance to read
   # the data returned by the request
-  if @htmlRequest.available?
-    @html = @htmlRequest.readRawSource # Read the raw data
-    @back = 255                        # Reset background
-    puts "Request completed!"          # Print message 
+  if @request.available?
+    @html = @request.read_raw_source # Read the raw data
+    @back = 255                    # Reset background
+    puts "Request completed!"      # Print message 
   end
 
   # Draw some lines with colors based on characters from data retrieved
@@ -72,23 +72,23 @@ def draw
 # Timer Class from Chapter 10
 #
 class Timer
-  def initialize(tempTotalTime)
-    @totalTime = tempTotalTime
-    @running   = false
+  def initialize(total_time)
+    @total_time = total_time
+    @running    = false
   end
 
   def start
-    @running   = true
-    @savedTime = $app.millis
+    @running    = true
+    @saved_time = $app.millis
   end
 
   def finished?
-    passedTime = $app.millis - @savedTime
-    if @running && (passedTime > @totalTime)
+    finished = $app.millis - @saved_time > @total_time      
+    if @running && finished
       @running = false
-      return true;
+      return true
     else
-      return false;
+      return false
     end
   end
 end

chapter_18/08_loading_xml_with_simpleml.rb

@@ -10,21 +10,20 @@ def setup
   # Creating and starting the request
   # An array of XML elements can be retrieved using getElementArray. 
   # This only works for elements with the same name that appear multiple times in the XML document.
-  @xmlRequest = XMLRequest.new(self, "http://rss.news.yahoo.com/rss/topstories")
-  @xmlRequest.makeRequest
+  @request = XMLRequest.new(self, "http://rss.news.yahoo.com/rss/topstories")
+  @request.makeRequest
 end
 
 def draw
   # When a request is finished the data the available 
   # flag is set to true - and we get a chance to read
   # the data returned by the request
-  if @xmlRequest.available?
+  if @request.available?
     # Retrieving an array of all XML elements inside "  title*  " tags
-    headlines = @xmlRequest.getElementArray("title")
-    headlines.each do |headline|
-      puts headline # XXX: was println(headlines[i]);
-    end
-    noLoop # Nothing to see here
+    headlines = @request.get_element_array("title")
+    # XXX: was println(headlines[i]);
+    headlines.each {|line| puts line }
+    no_loop # Nothing to see here
   end
 end
 

chapter_18/data/data-2.txt

@@ -1,10 +1,10 @@
-12, 39, 72
-0.0, 21.0, 69.0
-37, 1, 69
-1, 46, 66
-23, 22, 70
-8, 7, 72
-38.0, 25.0, 68.0
-14, 139, 72
-42, 124, 71
-33, 54, 66
+12.0, 39.0, 72.0
+18.0, 53.0, 69.0
+51.0, 24.0, 72.0
+0.0, 23.0, 72.0
+0.0, 25.0, 72.0
+8.0, 7.0, 72.0
+0.0, 0.0, 72.0
+14.0, 139.0, 72.0
+27.0, 106.0, 71.0
+103.0, 7.0, 72.0