more samples

samples/external_library/ruby_gem/toxiclibs/README.md

@@ -1,30 +1,5 @@
-### Using Toxiclibs jars in JRubyArt
-
-Here we demonstrate how to use Karsten Schmidts (aka toxi, @postspectacular) toxiclibs jars in ruby-processing. Using the [toxiclibs gem][]...  
-NB: need to use the --nojruby flag when running gray_scott_image.rb (ie use jruby-complete see wiki for why?)
-
-### Web Links
-
-[Post Spectacular Home][]
-
-[Toxiclibs Clone][]
-
-[Toxiclibs Documentation][]
-
-### Licensing
-
-I should be clear that the original toxiclibs is the work of Karsten Schmidt:-
-
-Copyright (c) 2010 Karsten Schmidt
-
-This demo & library is free software you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation either
-version 2.1 of the License, or (at your option) any later version.
-
-
-[Post Spectacular Home]:http://postspectacular.com/
-[Toxiclibs Clone]:https://github.com/ruby-processing/toxiclibs
-[Toxiclibs Documentation]:http://toxiclibs.org/
-[toxiclibs gem]:https://github.com/ruby-processing/toxicgem
-
+### Toxiclibs
+These examples require installation of the 'toxiclibs' gem. Whilst they work they are mainly a translation exercise and could do with  a bit re-factoring for ruby-processing.
+```bash
+gem install toxiclibs
+```

samples/external_library/ruby_gem/toxiclibs/physics/force_directed_graph/cluster.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Force directed graph
+# Heavily based on: http://code.google.com/p/fidgen/
+class Cluster
+  include Processing::Proxy
+  attr_reader :nodes, :diameter, :physics
+
+  # We initialize a Cluster with a number of nodes, a diameter, and centerpoint
+  def initialize(physics, n, d, center)
+    @diameter, @physics = d, physics
+    # Create the nodes
+    @nodes = (0..n).map { Node.new(center.add(TVec2D.randomVector)) }
+    # Connect all the nodes with a Spring
+    nodes[1..nodes.size - 1].each_with_index do |pi, i|
+      nodes[0..i].each do |pj|
+        physics.addSpring(Physics::VerletSpring2D.new(pi, pj, diameter, 0.01))
+      end
+    end
+  end
+
+  def display
+    # Show all the nodes
+    nodes.each(&:display)
+  end
+
+  # This functons connects one cluster to another
+  # Each point of one cluster connects to each point of the other cluster
+  # The connection is a "VerletMinDistanceSpring"
+  # A VerletMinDistanceSpring is a spring which only enforces its rest length if the
+  # current distance is less than its rest length. This is handy if you just want to
+  # ensure objects are at least a certain distance from each other, but don't
+  # care if it's bigger than the enforced minimum.
+  def connect(other)
+    other_nodes = other.nodes
+    nodes.each do |pi|
+      other_nodes.each do |pj|
+        physics.addSpring(Physics::VerletMinDistanceSpring2D.new(pi, pj, (diameter + other.diameter) * 0.5, 0.05))
+      end
+    end
+  end
+
+  # Draw all the internal connections
+  def internal_connections
+    stroke(200, 0, 0, 80)
+    nodes[0..nodes.size - 1].each_with_index do |pi, i|
+      nodes[i + 1..nodes.size - 1].each do |pj|
+        line(pi.x, pi.y, pj.x, pj.y)
+      end
+    end
+  end
+
+  # Draw all the connections between this Cluster and another Cluster
+  def show_connections(other)
+    stroke(200, 200, 0, 20)
+    stroke_weight(2)
+    other_nodes = other.nodes
+    nodes.each do |pi|
+      other_nodes[0..other_nodes.size - 1].each do |pj|
+        line(pi.x, pi.y, pj.x, pj.y)
+      end
+    end
+  end
+end

samples/external_library/ruby_gem/toxiclibs/physics/force_directed_graph/force_directed_graph.rb

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+#
+# <p>Force directed graph,
+# heavily based on: <a href="http:#code.google.com/p/fidgen/">fid.gen</a><br/>
+# <a href="http:#www.shiffman.net/teaching/nature/toxiclibs/">The Nature of Code</a><br/>
+# Spring 2010</p>
+#
+# Copyright (c) 2010 Daniel Shiffman
+#
+# This demo & library is free software you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# http:#creativecommons.org/licenses/LGPL/2.1/
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+require 'toxiclibs'
+require_relative 'cluster'
+require_relative 'node'
+
+attr_reader :physics, :clusters, :show_physics, :show_particles, :f
+
+def setup
+  size(640, 360)
+  @f = create_font('Georgia', 12, true)
+  @show_physics = true
+  @show_particles = true
+  # Initialize the physics
+  @physics = Physics::VerletPhysics2D.new
+  physics.setWorldBounds(Toxi::Rect.new(10, 10, width - 20, height - 20))
+  # Spawn a new random graph
+  new_graph
+end
+
+# Spawn a new random graph
+def new_graph
+  # Clear physics
+  physics.clear
+  center = TVec2D.new(width / 2, height / 2)
+  @clusters = (0..8).map { Cluster.new(physics, rand(3..8), rand(20..100), center) }
+  #	All clusters connect to all clusters
+  clusters.each_with_index do |ci, i|
+    clusters[i + 1..clusters.size - 1].each do |cj|
+      ci.connect(cj)
+    end
+  end
+end
+
+def draw
+  # Update the physics world
+  physics.update
+  background(255)
+  # Display all points
+  clusters.each(&:display) if show_particles
+  # If we want to see the physics
+  if show_physics
+    clusters.each_with_index do |ci, i|
+      ci.internal_connections
+      # Cluster connections to other clusters
+      clusters[1 + i..clusters.size - 1].each do |cj|
+        ci.show_connections(cj)
+      end
+    end
+  end
+  # Instructions
+  fill(0)
+  text_font(f)
+  text("'p' to display or hide particles\n'c' to display or hide connections\n'n' for new graph", 10, 20)
+end
+
+# Key press commands
+def key_pressed
+  case key
+  when 'c'
+    @show_physics = !show_physics
+    @show_particles = true unless show_physics
+  when 'p'
+    @show_particles = !show_particles
+    @show_physics = true unless show_particles
+  when  'n'
+    new_graph
+  end
+end

samples/external_library/ruby_gem/toxiclibs/physics/force_directed_graph/node.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Force directed graph
+# Heavily based on: http:#code.google.com/p/fidgen/
+# Notice how we are using inheritance here!
+# We could have just stored a reference to a VerletParticle object
+# inside the Node class, but inheritance is a nice alternative
+class Node < Physics::VerletParticle2D
+  include Processing::Proxy
+
+  def initialize(pos)
+    super(pos)
+  end
+
+  # All we're doing really is adding a display function to a VerletParticle
+  def display
+    fill(50, 200, 200, 150)
+    stroke(50, 200, 200)
+    stroke_weight(2)
+    ellipse(x, y, 16, 16)
+  end
+end

samples/external_library/ruby_gem/toxiclibs/physics/simple_spring/particle.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Notice how we are using inheritance here!
+# We could have just stored a reference to a VerletParticle2D object
+# inside the Particle class, but inheritance is an alternative
+class Particle < Physics::VerletParticle2D
+  include Processing::Proxy
+  def initialize(loc)
+    super(loc)
+  end
+
+  # All we're doing really is adding a display function to a VerletParticle
+  def display
+    fill(127)
+    stroke(0)
+    stroke_weight(2)
+    ellipse(x, y, 32, 32)
+  end
+end

samples/external_library/ruby_gem/toxiclibs/physics/simple_spring/simple_spring.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+# Simple Toxiclibs Spring requires 'toxiclibs gem'
+
+require 'toxiclibs'
+require_relative 'particle'
+
+attr_reader :physics, :p1, :p2
+
+def setup
+  size(640, 360)
+  # Initialize the physics
+  @physics = Physics::VerletPhysics2D.new
+  physics.addBehavior(Physics::GravityBehavior2D.new(TVec2D.new(0, 0.5)))
+  # Set the world's bounding box
+  physics.setWorldBounds(Toxi::Rect.new(0, 0, width, height))
+  # Make two particles
+  @p1 = Particle.new(TVec2D.new(width / 2, 20))
+  @p2 = Particle.new(TVec2D.new(width / 2 + 160, 20))
+  # Lock one in place
+  p1.lock
+  # Make a spring connecting both Particles
+  spring = Physics::VerletSpring2D.new(p1, p2, 160, 0.01)
+  # Anything we make, we have to add into the physics world
+  physics.addParticle(p1)
+  physics.addParticle(p2)
+  physics.addSpring(spring)
+end
+
+def draw
+  # Update the physics world
+  physics.update
+  background(255)
+  # Draw a line between the particles
+  stroke(0)
+  stroke_weight(2)
+  line(p1.x, p1.y, p2.x, p2.y)
+  # Display the particles
+  p1.display
+  p2.display
+  # Move the second one according to the mouse
+  return unless mouse_pressed?
+  p2.lock
+  p2.set_x mouse_x
+  p2.set_y mouse_y
+  p2.unlock
+end

samples/external_library/ruby_gem/toxiclibs/physics/soft_string/chain.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+# A soft pendulum (series of connected springs)
+class Chain
+  include Processing::Proxy
+  # Chain properties
+  attr_reader :total_length, :num_points, :strength, :radius, :particles, :tail
+  attr_reader :physics, :dragged, :offset
+
+  # Chain constructor
+  def initialize(p, l, n, r, s)
+    @particles = []
+    @physics, @total_length, @num_points, @radius, @strength = p, l, n, r, s
+    len = total_length / num_points
+    @offset = Vect.new(0, 0)
+    # Here is the real work, go through and add particles to the chain itself
+    num_points.times do |i|
+      # Make a new particle with an initial starting location
+      particle = Particle.new($app.width / 2, i * len)
+      # Redundancy, we put the particles both in physics and in our own Array
+      physics.addParticle(particle)
+      particles << particle
+      # Connect the particles with a Spring (except for the head)
+      next if (i == 0)
+      previous = particles[i - 1]
+      # Add the spring to the physics world
+      physics.addSpring(Physics::VerletSpring2D.new(particle, previous, len, strength))
+    end
+    # Keep the top fixed
+    particles[0].lock
+    # Store reference to the tail
+    @tail = particles[num_points - 1]
+    tail.radius = radius
+  end
+
+  # Check if a point is within the ball at the end of the chain
+  # If so, set dragged = true
+  def contains(x, y)
+    return if (x - tail.x) * (x - tail.x)  + (y - tail.y) * (y - tail.y) < radius * radius
+    offset.x = tail.x - x
+    offset.y = tail.y - y
+    tail.lock
+    @dragged = true
+  end
+
+  # Release the ball
+  def release
+    tail.unlock
+    @dragged = false
+  end
+
+  # Update tail location if being dragged
+  def update_tail(x, y)
+    tail.set(x + offset.x, y + offset.y) if dragged
+  end
+
+  # Draw the chain
+  def display
+    # Draw line connecting all points
+    begin_shape
+    stroke(0)
+    stroke_weight(2)
+    no_fill
+    particles.each { |p| vertex(p.x, p.y) }
+    end_shape
+    tail.display
+  end
+end
+
+Vect = Struct.new(:x, :y)

samples/external_library/ruby_gem/toxiclibs/physics/soft_string/particle.rb

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+# Notice how we are using inheritance here!
+# We could have just stored a reference to a VerletPhysics2D object
+# inside the Particle class, but inheritance is a nice alternative
+
+class Particle < Physics::VerletParticle2D
+  include Processing::Proxy
+  attr_accessor :radius  # Adding a radius for each particle
+
+  def initialize(x, y)
+    super(x, y)
+    @radius = 4
+  end
+
+  # All we're doing really is adding a display function to a VerletParticle2D
+  def display
+    fill(127)
+    stroke(0)
+    stroke_weight(2)
+    ellipse(x, y, radius * 2, radius * 2)
+  end
+end