Module: Chingu::Traits::BoundingBox

Defined in:
lib/chingu/traits/bounding_box.rb

Overview

Providing a bounding_box-method which generates a AABB on the fly from: x, y, factor_x, factor_y and rotation_center

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#bounding_box ⇒ Object Also known as: bb

Returns an instance of class Rect



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# File 'lib/chingu/traits/bounding_box.rb', line 44

def bounding_box        
  if @cached_bounding_box
    @cached_bounding_box.x = self.x + @_x_diff
    @cached_bounding_box.y = self.y + @_y_diff
    
    return @cached_bounding_box
  end
  
  width = self.image.width * self.factor_x.abs
  height = self.image.height * self.factor_y.abs
  
  if trait_options[:bounding_box][:scale]
    width = width * trait_options[:bounding_box][:scale]
    height = height * trait_options[:bounding_box][:scale]
  end
  
  x = self.x - (width * self.center_x.abs)
  y = self.y - (height * self.center_y.abs)
  
  return Rect.new(x, y, width, height)
end

#cache_bounding_box ⇒ Object 



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# File 'lib/chingu/traits/bounding_box.rb', line 67

def cache_bounding_box
  @cached_bounding_box = nil
  @cached_bounding_box = self.bounding_box
  @_x_diff = @cached_bounding_box.x - self.x
  @_y_diff = @cached_bounding_box.y - self.y
end

#draw_trait ⇒ Object

def update_trait

cache_bounding_box  if trait_options[:bounding_box][:cache] && !@cached_bounding_box
super

end



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# File 'lib/chingu/traits/bounding_box.rb', line 79

def draw_trait      
  if trait_options[:bounding_box][:debug]
    $window.draw_rect(self.bounding_box, Chingu::DEBUG_COLOR, Chingu::DEBUG_ZORDER)
  end
  super
end

#setup_trait(options) ⇒ Object 



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# File 'lib/chingu/traits/bounding_box.rb', line 36

def setup_trait(options)
  @cached_bounding_box = nil
  super
end