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monkstone
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start checking examples for java idioms
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‎samples/processing_app/basics/arrays/README.md‎

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### Translated Sketches
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array.rb
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### More rubyified version
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ruby_array.rb

‎samples/processing_app/basics/arrays/array.rb‎

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# * An array is a list of data. Each piece of data in an array
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# * is identified by an index number representing its position in
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# * the array. Arrays are zero based, which means that the first
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# * element in the array is [0], the second element is [1], and so on.
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# * In this example, an array named "coswav" is created and
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# * filled with the cosine values. This data is displayed three
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# * separate ways on the screen.
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# An array is a list of data. Each piece of data in an array
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# is identified by an index number representing its position in
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# the array. Arrays are zero based, which means that the first
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# element in the array is [0], the second element is [1], and so on.
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# In this example, an array named "coswav" is created and
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# filled with the cosine values. This data is displayed three
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# separate ways on the screen.
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def setup
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size 640, 360
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coswave = []
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0.upto(width) do |i|
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amount = map i, 0, width, 0, PI
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coswave[i] = cos(amount).abs
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end
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0.upto(width) do |i|
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stroke(coswave[i] * 255)
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line(i, 0, i, height / 3)
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end
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0.upto(width) do |i|
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stroke(coswave[i] * 255 / 4)
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line(i, height / 3, i, height / 3 * 2)
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end
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0.upto(width) do |i|
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stroke(255 - coswave[i] * 255)
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line(i, height / 3 * 2, i, height)
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end
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end

‎samples/processing_app/basics/arrays/array_2d.rb‎

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# * Demonstrates the syntax for creating a two-dimensional (2D) array.
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# * Values in a 2D array are accessed through two index values.
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# * 2D arrays are useful for storing images. In this example, each dot
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# * is colored in relation to its distance from the center of the image.
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# Demonstrates the syntax for creating a two-dimensional (2D) array.
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# Values in a 2D array are accessed through two index values.
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# 2D arrays are useful for storing images. In this example, each dot
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# is colored in relation to its distance from the center of the image.
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def setup
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size 640, 360
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distances = Array.new( width ) { Array.new( height ) } # [width][height]
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stroke_weight 2
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max_distance = dist( width/2, height/2, width, height )
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distances = Array.new(width) { Array.new(height) } # [width][height]
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stroke_weight 2
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max_distance = dist(width / 2, height / 2, width, height)
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width.times do |x|
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height.times do |y|
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distance = dist( width/2, height/2, x, y )
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distance = dist(width / 2, height / 2, x, y)
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distances[x][y] = distance / max_distance * 255
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end
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end
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background 0
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background 0
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x = 0
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while x < distances.length
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y = 0
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y = 0
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while y < distances[x].length
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stroke distances[x][y]
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point x, y
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x += 2
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end
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end
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‎samples/processing_app/basics/arrays/array_objects.rb‎

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# * Demonstrates the syntax for creating an array of custom objects.
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# Demonstrates the syntax for creating an array of custom objects.
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UNIT = 40
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attr_reader :mods
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size 640, 360
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wide_count = width / UNIT
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height_count = height / UNIT
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@mods = []
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@mods = []
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wide_count.times do |i|
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height_count.times do |j|
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mods << CustomObject.new(j * UNIT, i * UNIT, UNIT/2, UNIT/2, rand(0.05..0.8))
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mods << CustomObject.new(j * UNIT, i * UNIT, UNIT / 2, UNIT / 2, rand(0.05..0.8))
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end
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end
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end
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no_stroke
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end
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def draw
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background 0
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background 0
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mods.each do |mod|
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mod.update
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mod.draw
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end
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end
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# the custom object
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class CustomObject
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include Processing::Proxy
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attr_reader :x, :y, :mx, :my, :size
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attr_reader :x, :y, :xdir, :ydir, :mx, :my, :size, :speed
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def initialize(mx, my, x, y, speed)
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@mx, @my = my, mx # This is backwards because the Processing example is backwards.
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@mx, @my = my, mx # because the Processing example is backwards.
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@x, @y = x.to_i, y.to_i
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@xdir, @ydir = 1, 1
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@speed = speed
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@size = UNIT
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end
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def update
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@x += @speed * @xdir
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unless (0..size).cover? x
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@x += speed * xdir
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unless (0..size).cover? x
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@xdir *= -1
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@x += @xdir
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@y += @ydir
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end
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if @y >= @size || x <= 0
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@ydir *= -1
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@y += @ydir
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@x += xdir
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@y += ydir
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end
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return unless y >= size || x <= 0
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@ydir *= -1
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@y += ydir
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end
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def draw
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fill(255)
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ellipse(mx + x, my + y, 6, 6)
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end
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end
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‎samples/processing_app/basics/arrays/ruby_array.rb‎

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# An array is a list of data. Each piece of data in an array
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# In ruby it is quite usual to initialize an array with a map, here we
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# also use ruby-processing map1d (in place of vanilla processing map)
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# Note how much more compact ruby-processing version is...
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def setup
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size 640, 360
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coswave = (0..width).map { |i| cos(map1d(i, (0..width), (0..PI))).abs }
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coswave.each_with_index do |value, i|
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stroke(value * 255)
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line(i, 0, i, height / 3)
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stroke(value * 255 / 4)
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line(i, height / 3, i, height / 3 * 2)
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stroke(255 - value * 255)
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line(i, height / 3 * 2, i, height)
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end
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end

‎samples/processing_app/basics/arrays/ruby_array_2d.rb‎

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# Demonstrates the syntax for creating a two-dimensional (2D) array.
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# Values in a 2D array are accessed through two index values.
3+
# 2D arrays are useful for storing images. In this example, each dot
4+
# is colored in relation to its distance from the center of the image.
5+
6+
def setup
7+
size 640, 360
8+
distances = Array.new(width) { Array.new(height) } # [width][height]
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stroke_weight 2
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max_distance = dist(width / 2, height / 2, width, height)
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width.times do |x|
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height.times do |y|
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distance = dist(width / 2, height / 2, x, y)
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distances[x][y] = distance / max_distance * 255
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end
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end
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background 0
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row = []
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(0...width).step(2) do |x|
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row = distances[x]
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(0...height).step(2) do |y|
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stroke row[y]
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point x, y
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end
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end
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end

‎samples/processing_app/basics/form/icosahedra.rb‎

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require 'forwardable'
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load_libraries :icosahedron, :vecmath
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def setup
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size 640, 360, P3D
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@ico1 = Icosahedron.new 75.0
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@ico2 = Icosahedron.new 75.0
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@ico3 = Icosahedron.new 75.0
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@ico1 = Icosahedron.new self, 75.0
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@ico2 = Icosahedron.new self, 75.0
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@ico3 = Icosahedron.new self, 75.0
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end
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def draw
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background 0
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lights
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translate width/2, height/2
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translate(width / 2, height / 2)
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push_matrix
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translate -width/3.5, 0
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translate(-width / 3.5, 0)
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rotate_x frame_count * PI / 185
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rotate_y frame_count * PI / -200
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stroke 170, 0, 0
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@ico2.draw
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pop_matrix
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push_matrix
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translate width/3.5, 0
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translate(width / 3.5, 0)
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rotate_x frame_count * PI / -200
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rotate_y frame_count * PI / 200
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no_stroke
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fill 0, 0, 185
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@ico3.draw
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pop_matrix
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end
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‎samples/processing_app/basics/form/library/icosahedron/icosahedron.rb‎

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# Example of replacing Processing::Proxy with extend Forwardable
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# And using Vec3D :to_vertex function
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class Icosahedron
2-
include Processing::Proxy # mixin Processing::Proxy
3-
attr_reader :r
4-
5-
def initialize(radius)
4+
extend Forwardable # replacing Processing::Proxy mixin
5+
def_delegators(:@app, :vertex, :begin_shape, :end_shape)
6+
attr_reader :r, :app, :renderer
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8+
def initialize(app, radius)
69
@r = radius
10+
@app = app
11+
@renderer = AppRender.new(app)
712
end
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##
1015
# Draw an icosahedron defined by a radius r.
1116
#
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def draw
13-
# Calculate the vertex data for an icosahedron inscribed by a sphere radius 'r'.
18+
# Calculate vertex data for an icosahedron inscribed by a sphere radius 'r'.
1419
# Use 4 Golden Ratio rectangles as the basis.
1520
phi = (1.0 + Math.sqrt(5.0)) / 2.0
1621
h = r / Math.sqrt(1.0 + phi * phi)
1722
v =
18-
[
19-
Vec3D.new(0, -h, h * phi), Vec3D.new(0, -h, -h * phi), Vec3D.new(0, h, -h * phi), Vec3D.new(0, h, h * phi),
20-
Vec3D.new(h, -h * phi, 0), Vec3D.new(h, h * phi, 0), Vec3D.new(-h, h * phi, 0), Vec3D.new(-h, -h * phi, 0),
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Vec3D.new(-h * phi, 0, h), Vec3D.new(-h * phi, 0, -h), Vec3D.new(h * phi, 0, -h), Vec3D.new(h * phi, 0, h)
23+
[
24+
Vec3D.new(0, -h, h * phi), Vec3D.new(0, -h, -h * phi),
25+
Vec3D.new(0, h, -h * phi), Vec3D.new(0, h, h * phi),
26+
Vec3D.new(h, -h * phi, 0), Vec3D.new(h, h * phi, 0),
27+
Vec3D.new(-h, h * phi, 0), Vec3D.new(-h, -h * phi, 0),
28+
Vec3D.new(-h * phi, 0, h), Vec3D.new(-h * phi, 0, -h),
29+
Vec3D.new(h * phi, 0, -h), Vec3D.new(h * phi, 0, h)
2230
]
23-
24-
begin_shape(TRIANGLES)
25-
26-
draw_triangle(v[0], v[7],v[4])
27-
draw_triangle(v[0], v[4], v[11])
28-
draw_triangle(v[0], v[11], v[3])
29-
draw_triangle(v[0], v[3], v[8])
30-
draw_triangle(v[0], v[8], v[7])
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32-
draw_triangle(v[1], v[4], v[7])
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draw_triangle(v[1], v[10], v[4])
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draw_triangle(v[10], v[11], v[4])
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draw_triangle(v[11], v[5], v[10])
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draw_triangle(v[5], v[3], v[11])
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draw_triangle(v[3], v[6], v[5])
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draw_triangle(v[6], v[8], v[3])
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draw_triangle(v[8], v[9], v[6])
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draw_triangle(v[9], v[7], v[8])
41-
draw_triangle(v[7], v[1], v[9])
42-
43-
draw_triangle(v[2], v[1], v[9])
44-
draw_triangle(v[2], v[10], v[1])
45-
draw_triangle(v[2], v[5], v[10])
46-
draw_triangle(v[2], v[6], v[5])
47-
draw_triangle(v[2], v[9], v[6])
48-
31+
32+
begin_shape(Java::ProcessingCore::PConstants::TRIANGLES)
33+
draw_triangle(v[0], v[7], v[4])
34+
draw_triangle(v[0], v[4], v[11])
35+
draw_triangle(v[0], v[11], v[3])
36+
draw_triangle(v[0], v[3], v[8])
37+
draw_triangle(v[0], v[8], v[7])
38+
draw_triangle(v[1], v[4], v[7])
39+
draw_triangle(v[1], v[10], v[4])
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draw_triangle(v[10], v[11], v[4])
41+
draw_triangle(v[11], v[5], v[10])
42+
draw_triangle(v[5], v[3], v[11])
43+
draw_triangle(v[3], v[6], v[5])
44+
draw_triangle(v[6], v[8], v[3])
45+
draw_triangle(v[8], v[9], v[6])
46+
draw_triangle(v[9], v[7], v[8])
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draw_triangle(v[7], v[1], v[9])
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draw_triangle(v[2], v[1], v[9])
49+
draw_triangle(v[2], v[10], v[1])
50+
draw_triangle(v[2], v[5], v[10])
51+
draw_triangle(v[2], v[6], v[5])
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draw_triangle(v[2], v[9], v[6])
4953
end_shape
5054
end
51-
55+
5256
def draw_triangle(p1, p2, p3)
53-
54-
vertex(p1.x, p1.y, p1.z)
55-
vertex(p2.x, p2.y, p2.z)
56-
vertex(p3.x, p3.y, p3.z)
57-
57+
p1.to_vertex(renderer)
58+
p2.to_vertex(renderer)
59+
p3.to_vertex(renderer)
5860
end
59-
60-
end
61+
end

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