Module: Chingu::Traits::CollisionDetection::ClassMethods

Defined in:
lib/chingu/traits/collision_detection.rb,
lib/chingu/traits/collision_detection.rb

Instance Method Summary collapse

Instance Method Details

#each_at(x, y) ⇒ Object

Yield all objects of this class that is colliding with point x,y

Example:

Enemy.each_at(sword.x, sword.y) { |enemy| enemy.die }


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# File 'lib/chingu/traits/collision_detection.rb', line 165

def each_at(x,y)
  self.all.each do |object|
    next  unless object.collidable
    yield object if object.respond_to?(:bb) && object.bb.collide_point?(x,y)
    yield object if object.respond_to?(:radius) && Gosu.distance(object.x, object.y, x, y) < object.radius
  end
end

#each_bounding_box_collision(*klasses) ⇒ Object

Works like each_collsion but with explicit bounding_box collisions (inline-code for speedups)


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# File 'lib/chingu/traits/collision_detection.rb', line 194

def each_bounding_box_collision(*klasses)
  Array(klasses).each do |klass|
    object2_list = (klass.respond_to?(:all) ? klass.all : Array(klass))
    self.all.each do |object1|
      object2_list.each do |object2|
        next  if object1 == object2  # Don't collide objects with themselves
        next  unless object1.collidable && object2.collidable
        yield object1, object2  if object1.bounding_box.collide_rect?(object2.bounding_box)
      end
    end
  end
end

#each_bounding_circle_collision(*klasses) ⇒ Object

Works like each_collision but with inline-code for speedups


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# File 'lib/chingu/traits/collision_detection.rb', line 176

def each_bounding_circle_collision(*klasses)
  Array(klasses).each do |klass|
    object2_list = (klass.respond_to?(:all) ? klass.all : Array(klass))
    #total_radius = object1.radius + object2.radius  # possible optimization?
    
    self.all.each do |object1|
      object2_list.each do |object2|
        next  if object1 == object2  # Don't collide objects with themselves
        next  unless object1.collidable && object2.collidable
        yield object1, object2  if Gosu.distance(object1.x, object1.y, object2.x, object2.y) < object1.radius + object2.radius
      end
    end
  end
end

#each_collision(*klasses) ⇒ Object

Class method that will check for collisions between all instances of two classes and yield the 2 colliding game object instances.

It will not collide objects with themselves.

example:

Enemy.each_collision(Bullet).each do |enemy, bullet| enemy.die!; end


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# File 'lib/chingu/traits/collision_detection.rb', line 218

def each_collision(*klasses)
  # Make sure klasses is always an array.
  Array(klasses).each do |klass|
    
    if self.respond_to?(:instance_methods) && klass.respond_to?(:instance_methods)
      if self.instance_methods.include?(:radius) && klass.instance_methods.include?(:radius)
        self.each_bounding_circle_collision(klass) do |o1, o2|
          yield o1, o2
        end
        next
      end
        
      if self.instance_methods.include?(:bounding_box) && klass.instance_methods.include?(:bounding_box)
        self.each_bounding_box_collision(klass) do |o1, o2|
          yield o1, o2
        end
        next
      end
    end
      
    #
    # Possible optimization, look into later.
    #
    # type1 = self.instance_methods.include?(:bounding_box) ? :bb : :bc
    # type2 = klass.instance_methods.include?(:bounding_box) ? :bb : :bc
    # Pointless optmization-attempts?
    #if type1 != type2
    #  self.all.each do |object1|
    #    object2_list.each do |object2|
    #      next  if object1 == object2  # Don't collide objects with themselves
    #      yield object1, object2  if object1.bounding_box_bounding_circle_collision?(object2)
    #    end
    #  end
    #end
    object2_list = (klass.respond_to?(:all) ? klass.all : Array(klass))
    self.all.each do |object1|
      object2_list.each do |object2|
        next  if object1 == object2  # Don't collide objects with themselves
        yield object1, object2  if object1.collides?(object2)
      end
    end
  end
end

#initialize_trait(options = {}) ⇒ Object 


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# File 'lib/chingu/traits/collision_detection.rb', line 39

def initialize_trait(options = {})
  trait_options[:collision_detection] = options
end