geomerative and verlet physics sketch

Author: monkstone

examples/README.md

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+Certain sketches in this folder need to be run with the `--nojruby` flag:-
+
+`physics_type.rb`
+
+`gray_scott_image.rb`

examples/data/ReplicaBold.ttf

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+load_library :geomerative
+require 'toxiclibs'
+include_package 'geomerative'
+
+attr_reader :font, :input, :physics
+
+def settings
+  size(1280, 720, P3D)
+  smooth
+end
+
+def setup
+  sketch_title 'Physics Type'
+  @input = 'Hello!'
+  RG.init(self)
+  fnt = RG.load_font('ReplicaBold.ttf') # file name
+  RG.text_font(fnt, 330) # RFont object, size
+  @font = RG.get_text(input) # String to RShape
+  RG.set_polygonizer(RCommand::UNIFORMLENGTH)
+  RG.set_polygonizer_length(10) # length of segment
+  init_physics
+  fill(255)
+end
+
+def draw
+  physics.update
+  background(0)
+  stroke(255)
+  physics.springs.each do |s|
+    line(s.a.x, s.a.y, s.b.x, s.b.y)
+  end
+  physics.particles.each do |p|
+    ellipse(p.x, p.y, 3, 3)
+  end
+end
+
+def init_physics
+  @physics = Physics::VerletPhysics2D.new
+  # set screen bounds as bounds for physics sim
+  physics.set_world_bounds(Toxi::Rect.new(0, 0, width, height))
+  # add gravity along positive Y axis
+  physics.add_behavior(Physics::GravityBehavior2D.new(TVec2D.new(0, 0.1)))
+  # multidimensional array of x and y coordinates
+  paths = font.get_points_in_paths
+  offset = TVec2D.new(200, 250)
+  return if paths.nil?
+  paths.length.times do |ii|
+    points = paths[ii]
+    path_particles = []
+    points.length.times do |i|
+      p = Physics::VerletParticle2D.new(
+        points[i].x + offset.x,
+        points[i].y + offset.y
+      )
+      physics.add_particle(p)
+      path_particles << p
+      physics.add_spring(
+        Physics::VerletSpring2D.new(
+          path_particles[i - 1],
+          p,
+          path_particles[i - 1].distanceTo(p),
+          1
+        )
+      ) if i > 0
+    end
+    first = path_particles.first
+    last = path_particles.last
+    physics.add_spring(
+      Physics::VerletSpring2D.new(
+        first,
+        last,
+        first.distance_to(last),
+        1
+      )
+    )
+    first.lock
+  end
+end