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Contents
#
# After a HashMap example
# by Daniel Shiffman.
#
# This example demonstrates how to use a Hash 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.
#
# The Processing classes IntHash, FloatHash, and StringHash offer a simple
# way of pairing Strings with numbers or other Strings. But are probably of
# less interest to rubyists.
#
# In this example, words that appear in one book (Dracula) are colored white
# whilst words in the other book (Frankenstein) are colored black.
#
load_library 'word'
DRACULA = 'dracula.txt'
FRANKENSTEIN = 'frankenstein.txt'
DRAC = /#{DRACULA}/
FRANK = /#{FRANKENSTEIN}/
attr_accessor :words
def setup
size(640, 360)
# Create the HashMap
@words = {}
# Load two files
load_file(DRACULA)
load_file(FRANKENSTEIN)
# Create the font
text_font(create_font('Georgia', 24))
end
def draw
background(126)
# Show words
words.values.each do |w|
if w.qualify?
w.display
w.move
end
end
end
# Load a file
def load_file(filename)
tokens = File.open(data_path(filename), 'r'){ |file| file.read.scan(/[\w'-]+/)}
tokens.each do |s|
s = s.downcase
# Is the word in the HashMap
if (words.key?(s))
# Get the word object and increase the count
# We access objects from a Hash via its key, the String
w = words[s]
# Which book am I loading?
if DRAC =~ filename
w.increment_dracula
elsif FRANK =~ filename
w.increment_franken
end
else
# Otherwise make a new word
w = Word.new(s)
# And add entry to the Hash
# The key for us is the String and the value is the Word object
words[s] = w
if DRAC =~ filename
w.increment_dracula
elsif FRANK =~ filename
w.increment_franken
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems