Contents

# Inheritance
# 
# A class can be defined using another class as a foundation. In object-oriented
# programming terminology, one class can inherit fields and methods from another. 
# An object that inherits from another is called a subclass, and the object it 
# inherits from is called a superclass. A subclass extends the superclass.
# NB: note the use of hook means inheriting class does not need to call super


def setup    
  size 640, 360
  @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

# vvv CLASS SPIN

class Spin
  
  attr_accessor :x, :y, :speed
  attr_accessor :angle
  
  def initialize(args = {})  	    
    @x, @y = args[:x], args[:y]
    @speed = args[:s]
    @angle = args[:angle] || 0.0
    post_initialize(args)  # this is the hook
  end
  
  def update  	    
    @angle += speed
  end
  
  def post_initialize args
    nil
  end
  
end

# ^^^ CLASS SPIN

# vvv CLASS SPINARM

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 SPINARM

# vvv CLASS SPINSPOTS

class SpinSpots < Spin    
  attr_accessor :dim
  
  def post_initialize args
    @dim = args[:d]
  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

# ^^^ CLASS SPINSPOTS

Version data entries

6 entries across 6 versions & 1 rubygems

Version	Path
ruby-processing-2.6.3	samples/processing_app/basics/objects/inheritance_two.rb
ruby-processing-2.6.2	samples/processing_app/basics/objects/inheritance_two.rb
ruby-processing-2.6.1	samples/processing_app/basics/objects/inheritance_two.rb
ruby-processing-2.6.0	samples/processing_app/basics/objects/inheritance_two.rb
ruby-processing-2.5.1	samples/processing_app/basics/objects/inheritance_two.rb
ruby-processing-2.5.0	samples/processing_app/basics/objects/inheritance_two.rb