Class: PhysicsManager

Inherits:
Object show all
Extended by:
Forwardable
Defined in:
lib/gamebox/core/physics_manager.rb

Overview

PhysicsManager creates and manages chipmunks space.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#space ⇒ Object

Returns the value of attribute space.



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# File 'lib/gamebox/core/physics_manager.rb', line 11

def space
  @space
end

#step_size ⇒ Object

Time per physics step, in milliseconds (default 15). Small steps make the simulation more stable than large steps, but if the step is too small, it may negatively affect performance, i.e. cause very high CPU use and/or low framerate.



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# File 'lib/gamebox/core/physics_manager.rb', line 19

def step_size
  @step_size
end

Instance Method Details

#add_collision_func(first_objs, second_objs, &block) ⇒ Object

allows for passing arrays of collision types not just single ones add_collision_func(, [:baz,:yar]) becomes: add_collision_func(:foo, :baz) add_collision_func(:foo, :yar) add_collision_func(:bar, :baz) add_collision_func(:bar, :yar)



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# File 'lib/gamebox/core/physics_manager.rb', line 73

def add_collision_func(first_objs, second_objs, &block)
  firsts = [first_objs].flatten
  seconds = [second_objs].flatten
  
  firsts.each do |f|
    seconds.each do |s|
      @space.add_collision_func(f,s) do |a, b|
        block.call a.actor, b.actor
      end
    end
  end
end

#configure ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 26

def configure
  @space = CP::Space.new
  @space.iterations = 10
  self.step_size = 15
  @leftover_step_time = 0
end

#pause ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 50

def pause
  pause_physics
end

#pause_physics ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 58

def pause_physics
  @physics_paused = true
end

#register_physical_constraint(constraint) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 105

def register_physical_constraint(constraint)
  @space.add_constraint constraint
end

#register_physical_object(obj, static = false) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 86

def register_physical_object(obj,static=false)
  obj.when :remove_me do
    unregister_physical_object obj
  end

  if static
    obj.shapes.each do |shape|
      @space.add_static_shape shape
    end
  else
    @space.add_body(obj.body)
    
    obj.shapes.each do |shape|
      @space.add_shape shape
    end
  end
end

#restart_physics ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 62

def restart_physics
  @physics_paused = false
end

#unpause ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 54

def unpause
  restart_physics
end

#unregister_physical_constraint(constraint) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 109

def unregister_physical_constraint(constraint)
  @space.remove_constraint constraint
end

#unregister_physical_object(obj, static = false) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 113

def unregister_physical_object(obj,static=false)
  if static
    obj.shapes.each do |shape|
      @space.remove_static_shape shape
    end
  else
    @space.remove_body(obj.body)
    
    obj.shapes.each do |shape|
      @space.remove_shape shape
    end
  end
end

#update(time) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 34

def update(time)
  update_physics time 
end

#update_physics(time) ⇒ Object 



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# File 'lib/gamebox/core/physics_manager.rb', line 38

def update_physics(time)
  unless @physics_paused
    @leftover_step_time += time
    steps = (@leftover_step_time / @step_size).ceil
    steps.times do
      @space.step @step_size_seconds
    end
    @leftover_step_time -= (steps * @step_size).round
  end
end