Class: Pongo::Composite

Inherits:
AbstractCollection show all
Defined in:
lib/pongo/composite.rb

Overview

The Composite class can contain Particles, and Constraints. Composites can be added to a parent Group, along with Particles and Constraints. Members of a Composite are not checked for collision with one another, internally.

Instance Attribute Summary collapse

Attributes inherited from AbstractCollection

#constraints, #is_parented, #particles, #sprite

Attributes inherited from AbstractItem

#always_repaint, #display_object, #display_object_offset, #display_object_rotation, #fill_alpha, #fill_color, #line_alpha, #line_color, #line_thickness, #renderer, #solid, #user_data, #visible

Instance Method Summary collapse

Methods inherited from AbstractCollection

#<<, #add_constraint, #add_particle, #all, #check_collisions_vs_collection, #check_internal_collisions, #cleanup, #collidable_constraints, #collidable_particles, #draw, #init, #integrate, #parented?, #remove_constraint, #remove_particle, #satisfy_constraints

Methods inherited from AbstractItem

#add_event_listener, #always_redraw!, #always_redraw=, #always_redraw?, #cleanup, #dispatch_event, #draw, #has_event_listener, #init, #set_fill, #set_line, #set_style, #visible!, #visible?

Constructor Details

#initialize ⇒ Composite

Returns a new instance of Composite.



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# File 'lib/pongo/composite.rb', line 11

def initialize
  super
  @delta = Vector.new
end

Instance Attribute Details

#delta ⇒ Object

Returns the value of attribute delta.



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# File 'lib/pongo/composite.rb', line 9

def delta
  @delta
end

Instance Method Details

#fixed=(b) ⇒ Object 



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# File 'lib/pongo/composite.rb', line 42

def fixed=(b)
  particles.each {|p| p.fixed = b}
end

#fixed? ⇒ Boolean Also known as: fixed

The fixed state of the Composite. Setting this value to true or false will set all of this Composite’s component particles to that value. Getting this value will return false if any of the component particles are not fixed.

Returns:

  • (Boolean) 


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# File 'lib/pongo/composite.rb', line 34

def fixed?
  particles.each do |p|
    return false unless p.fixed?
  end
  true
end

#relative_angle(center, p) ⇒ Object Also known as: get_relative_angle 



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# File 'lib/pongo/composite.rb', line 46

def relative_angle(center, p)
  @delta.set_to(p.x - center.x, p.y - center.y)
  Math.atan2(@delta.y, @delta.x)
end

#rotate_by_angle(angle_degrees, center) ⇒ Object

Rotates the Composite to an angle specified in degrees, around a given center



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# File 'lib/pongo/composite.rb', line 27

def rotate_by_angle(angle_degrees, center)
  rotate_by_radian(angle_degrees * Numeric::PI_OVER_ONE_EIGHTY, center)
end

#rotate_by_radian(angle_radians, center) ⇒ Object

Rotates the Composite to an angle specified in radians, around a given center



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# File 'lib/pongo/composite.rb', line 17

def rotate_by_radian(angle_radians, center)
  particles.each do |p|
    radius = p.center.distance(center)
    angle = relative_angle(center, p.center) + angle_radians
    p.px = (Math.cos(angle) * radius) + center.x
    p.py = (Math.sin(angle) * radius) + center.y
  end
end