Class: Chingu::ParallaxLayer

Inherits:
GameObject show all
Defined in:
lib/chingu/parallax.rb

Overview

ParallaxLayer is mainly used by class Parallax to keep track of the different layers. If you @parallax << { :image => “foo.png” } a ParallaxLayer will be created automaticly from that Hash.

If no zorder is provided the ParallaxLayer-class increments an internal zorder number which will put the last layer added on top of the rest.

Constant Summary collapse

@@zorder_counter = 
0

Instance Attribute Summary collapse

Attributes inherited from GameObject

#angle, #center, #center_x, #center_y, #color, #factor, #factor_x, #factor_y, #image, #mode, #x, #y, #zorder

Attributes inherited from BasicGameObject

#options, #parent, #paused, #visible

Instance Method Summary collapse

Methods inherited from GameObject

#distance_to, #draw, #inside_window?, #outside_window?

Methods included from Helpers::RotationCenter

#rotation_center

Methods included from Helpers::InputClient

#input, #input=

Methods inherited from BasicGameObject

all, create, #destroy, destroy_all, destroy_if, #draw, #draw_trait, has_trait, has_traits, #hide!, #pause!, #setup_trait, #show!, size, #unpause!, #update, #update_trait

Constructor Details

#initialize(options) ⇒ ParallaxLayer

Returns a new instance of ParallaxLayer.



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# File 'lib/chingu/parallax.rb', line 105

def initialize(options)
  # No auto update/draw, the parentclass Parallax takes care of that!
  options.merge!(:visible => false, :paused => true)
  
  # If no zorder is given, use a global incrementing counter. First added, furthest behind when drawn.
  options.merge!(:zorder => (@@zorder_counter+=1))  if options[:zorder].nil?
  
  super(options)
  
  @damping = options[:damping] || 10
end

Instance Attribute Details

#damping ⇒ Object (readonly)

Returns the value of attribute damping.



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# File 'lib/chingu/parallax.rb', line 103

def damping
  @damping
end

Instance Method Details

#get_pixel(x, y) ⇒ Object

Gets pixel from layers image The pixel is from the window point of view, so coordinates are converted:

@parallax.layers.first.get_pixel(10, 10)        # the visible pixel at 10, 10
@parallax.layers.first.image.get_pixel(10, 10)  # gets pixel 10, 10 from layers image no matter where layer is positioned



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# File 'lib/chingu/parallax.rb', line 124

def get_pixel(x, y)
  image_x = x - @x
  image_y = y - @y
  
  # On a 100 x 100 image, get_pixel works to 99 x 99
  image_x -= @image.width   while image_x >= @image.width 
  
  @image.get_pixel(image_x, image_y)
end