Class: BulldogPhysics::Particles::Collisions::ParticleRod

Inherits:
ParticleLink show all
Defined in:
lib/Particles/particle_rod.rb

Overview

Cables link a pair of particles, generating a contact if they stray too far apart.

Instance Attribute Summary collapse

Attributes inherited from ParticleLink

#particle1, #particle2

Instance Method Summary collapse

Constructor Details

#initialize(particle1, particle2, length) ⇒ ParticleRod

Returns a new instance of ParticleRod.



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# File 'lib/Particles/particle_rod.rb', line 14

def initialize(particle1, particle2, length)
  super(particle1, particle2)
  @length = length
  puts "CREATING ROD WITH LENGTH #{@length}"
end

Instance Attribute Details

#length ⇒ Object

Holds the length of the rod



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# File 'lib/Particles/particle_rod.rb', line 11

def length
  @length
end

Instance Method Details

#add_contact(contactArray, limit) ⇒ Object

  • Fills the given contact structure with the contact needed to keep the rod from extending or compressing.



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# File 'lib/Particles/particle_rod.rb', line 21

def add_contact(contactArray, limit)
  current_len = current_length

  if( current_len == @length)
    return 0
  end
  
  
  contact = ParticleContact.new(@particle1, @particle2)
  
  normal = @particle2.position - @particle1.position
  normal.normalize
  # The contact normal depends on whether we’re extending or compressing.
  
  contact.contact_normal = normal

  if( current_len > @length)
    contact.penetration = (current_len - @length)
  else
    contact.contact_normal *= -1
    contact.penetration = @length - current_len
  end

  contact.restitution = 0
  contactArray << contact
  
  return 1
end

#current_length ⇒ Object 



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# File 'lib/Particles/particle_rod.rb', line 50

def current_length
  (@particle1.position - @particle2.position).magnitude
end