Chaos Project

=begin 

  -------------------------------------------------- --------------------------- 
  By newold 
  08/10/2011 
  -------------------------------------------------- --------------------------- 
   
  This script will create viewport for sprites in any way 
  (circle, triangle, irregular polygon...). 
   
  -------------------------------------------------- --------------------------- 
   
  Use: 
   
  The script load images from folder that will contain viewport-mask. 
  (Any non-transparent part of these images will be deleted on the image 
  sprite) 
   
  Once you've created your sprite and you've assigned a picture, you can apply 
  this new viewport like this: 
   
  your_sprite.mask = Viewport_Mask.new ("Name of pattern of the viewport") 
   
  Automatically, the image of the sprite will be resized to size of the image 
  pattern, and it will look as form of the pattern. 
   
  To move the image on the new viewport, use this command: 
   
  your_sprite.ani_mask(Speed X, Speed Y) 
   
  the image will move as if it were a plane 
   
  ****************************************************************************** 
  Tutorial to create pattern in Photoshop: 
  ****************************************************************************** 
  1 - Create a new image.
  2 - Draw the desired shape of the viewport with a solid color 
      (Eg: #000000) 
  3 - Once created the pattern, you pressed press "Left click" on 
      the image in the layers palette with "CTRL" pressed, to select your pattern. 
  4 - Press "delete/Back" to delete the pattern.
  5 - Press CTRL + SHIFT + I to invert the selection 
  6 - Take the paint with a solid color (Eg: #000000) 
  7 - Fill the selection 
  8 - Save the pattern as png in the pictures folder of your game 
  9 - Now you can use this pattern to create a viewport with him. 
  ****************************************************************************** 
   
   
=end

class Circle 
  
  def initialize(center_x, center_y, radius)
    @center_x = center_x
    @center_y = center_y
    @radius = radius
  end
  
  def in_area?(x, y)
    square_dist = (@center_x - x) ** 2 + (@center_y - y) ** 2
    return square_dist <= @radius ** 2
  end
end