bubble factory

Author: monkstone

examples/blob/bubbles.rb

@@ -10,10 +10,11 @@
 require 'pbox2d'
 require 'forwardable'
 require_relative 'lib/boundary'
+require_relative 'lib/bubble_factory'
 require_relative 'lib/bubble'
 
-Vect = Struct.new(:x, :y)
-attr_reader :boundaries, :box2d, :bubble, :bubble1, :bubble2
+
+attr_reader :boundaries, :box2d, :bubble, :bubble1, :bubble2, :bubble_factory
 
 def settings
   size(400, 400)
@@ -25,26 +26,27 @@ def setup
   @box2d = WorldBuilder.build(app: self, gravity: [0, 30])
   box2d.create_world
   @boundaries = []
-  boundaries << Boundary.new(box2d, Vect.new(160, 135), Vect.new(20, height * 0.2))
-  boundaries << Boundary.new(box2d, Vect.new(240, 135), Vect.new(20, height * 0.2))
+  boundaries << Boundary.new(box2d, Vect.new(160, 135), Vect.new(20, height * 0.21))
+  boundaries << Boundary.new(box2d, Vect.new(240, 135), Vect.new(20, height * 0.21))
   boundaries << Boundary.new(box2d, Vect.new(130, 190), Vect.new(80, 20), 0.5)
   boundaries << Boundary.new(box2d, Vect.new(270, 190), Vect.new(80, 20), -0.5)
   boundaries << Boundary.new(box2d, Vect.new(100, height * 0.9), Vect.new(20, height * 0.8))
   boundaries << Boundary.new(box2d, Vect.new(300, height * 0.9), Vect.new(20, height * 0.8))
-  @bubble = Bubble.new(pos: Vect.new(rand(130..270), height - 20), hue: 255)
-  @bubble1 = Bubble.new(pos: Vect.new(rand(130..270), height + 20), hue: 255)
-  @bubble2 = Bubble.new(pos: Vect.new(rand(130..270), height + 60), hue: 255)
+  @bubble_factory = BubbleFactory.new(xrange: (145..255))
+  @bubble = bubble_factory.create_bubble(height: height - 20, hue: 255)
+  @bubble1 = bubble_factory.create_bubble(height: height + 20, hue: 255)
+  @bubble2 = bubble_factory.create_bubble(height: height + 60, hue: 255)
 end
 
 def draw
   background(0, 0, 255)
-  # We must always step through time!  
+
   boundaries.each(&:display)
   # Show the blobs! 
-  @bubble = Bubble.new(pos: Vect.new(rand(120..280), height - 20), hue: 255) if ((frame_count % 340) == 0)
+  @bubble = bubble_factory.create_bubble(height: height - 20, hue: 255) if ((frame_count % 240) == 0)
   bubble.display
-  @bubble1 = Bubble.new(pos: Vect.new(rand(120..280), height - 20), hue: 255) if ((frame_count % 440) == 0)
+  @bubble1 = bubble_factory.create_bubble(height: height + 20, hue: 255) if ((frame_count % 280) == 0)
   bubble1.display
-  @bubble2 = Bubble.new(pos: Vect.new(rand(120..280), height - 20), hue: 255) if ((frame_count % 540) == 0)
+  @bubble2 = bubble_factory.create_bubble(height: height + 60, hue: 255) if ((frame_count % 320) == 0)
   bubble2.display
 end

examples/blob/lib/bubble.rb

@@ -45,9 +45,9 @@ def initialize(pos:, hue:)
       # For filtering out collisions
       #fd.filter.groupIndex = -2
       # Parameters that affect physics
-      fd.set_density(0.1)
-      fd.set_restitution(0.05)
-      fd.set_friction(1.0)
+      fd.set_density(1.0)
+      fd.set_restitution(0.5)
+      fd.set_friction(0.5)
       # Finalize the body
       body.create_fixture(fd)
       # Add it to the volume
@@ -56,8 +56,8 @@ def initialize(pos:, hue:)
       outline << body
    end
     # These parameters control how stiff vs. jiggly the blob is
-    cvjd.frequencyHz = 10.0
-    cvjd.dampingRatio = 3.0
+    cvjd.frequencyHz = 0.0
+    cvjd.dampingRatio = 0.0
     # Put the joint thing in our world!
     box2d.world.create_joint(cvjd)
  end

examples/blob/lib/bubble_factory.rb

@@ -0,0 +1,12 @@
+Vect = Struct.new(:x, :y)
+
+class BubbleFactory
+  attr_reader :xrange
+  def initialize(xrange:)
+    @xrange = xrange
+  end
+  
+  def create_bubble(hue:, height:)
+    Bubble.new(pos: Vect.new(rand(xrange), height), hue: hue)
+  end
+end