add ruby hook examples

Author: monkstone

processing_app/topics/ruby_hook/hooky.rb

@@ -0,0 +1,34 @@
+#!/usr/bin/env jruby
+# Hooky class demonstrates how to use the post_initialize hook, creating three
+# sketches on a single thread in propane
+require 'propane'
+
+class Hooky < Propane::App
+  attr_reader :back, :title
+
+  def setup
+    sketch_title title
+  end
+
+  def post_initialize(args)
+    @back = args.fetch(:back_color)
+    @title = args.fetch(:title)
+  end
+
+  def settings
+    size 200, 200
+  end
+
+  def draw
+    background(color(back))
+  end
+end
+
+colors = %w[#ff0000 #00ff00 #0000ff].freeze
+title = %w[one two three].freeze
+opt_values = colors.zip(title)
+
+options = opt_values.flat_map { |values| [back_color: values[0], title: values[1]] }
+options.each do |opts|
+  Hooky.new(opts)
+end

processing_app/topics/ruby_hook/hooky_thread.rb

@@ -0,0 +1,13 @@
+#!/usr/bin/env jruby
+# Creating threaded instance of Hooky maty not be mush use because we create a
+# global $app
+require_relative 'lib/hooky_instance'
+
+colors = %w[#ff0000 #00ff00 #0000ff].freeze
+title = %w[one two three].freeze
+opt_values = colors.zip(title)
+
+options = opt_values.flat_map { |values| [back_color: values[0], title: values[1]] }
+options.each do |opts|
+  java.lang.Thread.new(Hooky.new(opts)).start
+end

processing_app/topics/ruby_hook/lib/hooky_instance.rb

@@ -0,0 +1,30 @@
+#!/usr/bin/env jruby
+# Hooky class demonstrates how to use the post_initialize hook with java
+# thread
+require 'propane'
+
+class Hooky < Propane::App
+  include java.lang.Runnable
+  attr_reader :back, :title
+
+  def setup
+    sketch_title title
+  end
+
+  def post_initialize(args)
+    @back = args.fetch(:back_color)
+    @title = args.fetch(:title)
+  end
+
+  def settings
+    size 200, 200
+  end
+
+  def draw
+    background(color(back))
+  end
+
+  def run
+    puts "starting #{title}"
+  end
+end

processing_app/topics/ruby_hook/subclass.rb

@@ -0,0 +1,80 @@
+#!/usr/bin/env jruby
+require 'propane'
+
+class SubClassSketch < Propane::App
+
+  def setup
+    sketch_title 'Subclass with a Hook'
+    @arm = SpinArm.new(x: width / 2, y: height / 2, s: 0.01)
+    @spots = SpinSpots.new(x: width / 2, y: height / 2, s: -0.02, d: 90.0)
+  end
+
+  def draw
+    background 204
+    @arm.display
+    @spots.display
+  end
+
+  def settings
+    size 640, 360
+  end
+end
+
+class Spin
+  include Propane::Proxy
+  attr_accessor :x, :y, :speed
+  attr_accessor :angle
+
+  def initialize(args = {})
+    @x, @y = args.fetch(:x, 0), args.fetch(:y, 0)
+    @speed = args.fetch(:s, 0.1)
+    @angle = args.fetch(:angle, 0.0)
+    post_initialize(args)  # this is the hook
+  end
+
+  def update
+    @angle += speed
+  end
+
+  def post_initialize(_args)
+    nil
+  end
+
+end
+
+class SpinArm < Spin # inherit from (or "extend") class Spin
+  # NB: initialize inherited from Spin class
+
+  def display
+    stroke_weight 1
+    stroke 0
+    push_matrix
+    translate x, y
+    update
+    rotate angle
+    line 0, 0, 165, 0
+    pop_matrix
+  end
+end
+
+class SpinSpots < Spin
+  attr_accessor :dim
+
+  def post_initialize(args)
+    @dim = args.fetch(:d, 10)
+  end
+
+  def display
+    no_stroke
+    push_matrix
+    translate x, y
+    update
+    rotate angle
+    ellipse(-dim / 2, 0, dim, dim)
+    ellipse(dim / 2, 0, dim, dim)
+    pop_matrix
+  end
+end
+
+
+SubClassSketch.new