#==============================================================================
# ** Randomizing stuff
#------------------------------------------------------------------------------
#  Methods for Enumerable classes (like Array), for creating random entries and
#  random iteration. and a destructive shuffle! for class Array.
#==============================================================================

module Enumerable
 
  def shuffle
    array = self.entries
    return Array.new(self.size){
      array.delete_at(rand(array.size))
    }
  end
 
  def random_each
    for obj in self.shuffle
      yield obj
    end
  end
 
  def random_each_with_index
    self.shuffle.each_with_index do |obj, i|
      yield obj, i
    end
  end
 
end

class Array
  def shuffle!
    array = self.shuffle
    result = array == self ? nil : self
    clear()
    self.concat(array)
    return result
  end
end

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  #--------------------------------------------------------------------------
  # * Draw Slant Bar (by SephirothSpawn)
  #--------------------------------------------------------------------------
  def draw_slant_bar(x, y, min, max, width = 152, height = 6,
      bar_color = Color.new(150, 0, 0, 255),
      end_color = Color.new(255, 255, 60, 255))
    # Draw Border
    for i in 0..height
      self.fill_rect(x+i, y+height-i, width+1, 1, Color.new(50, 50, 50, 255))
    end
    # Draw Background
    for i in 1...(height - 1)
      r = 100 * (height - i) / height
      g = 100 * (height - i) / height
      b = 100 * (height - i) / height
      a = 255
      self.fill_rect(x + i, y + height - i, width, 1, Color.new(r, b, g, a))
    end
    # Draws Bar
    for i in 1...( (min.to_f / max.to_f) * width - 1).to_i
      r = bar_color.red   * (width - i) / width + end_color.red   * i / width
      g = bar_color.green * (width - i) / width + end_color.green * i / width
      b = bar_color.blue  * (width - i) / width + end_color.blue  * i / width
      a = bar_color.alpha * (width - i) / width + end_color.alpha * i / width
      for j in 1..(height - 1)
        r = r * (height - j) / height + (3 * r / 4) * j / height
        g = g * (height - j) / height + (3 * g / 4) * j / height
        b = b * (height - j) / height + (3 * b / 4) * j / height
        self.fill_rect(x + i + j, y + height - j, 1, 1, Color.new(r, g, b, a))
      end
    end
  end

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