class Circle

# File lib/zadt/HelpModules/Functionality/Geometrics/circle.rb, line 8
def self.help
  Circle.show_help_message
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 5
def initialize(radius = 1, center = [0,0], pct_error = 1)
  super(radius, center, pct_error)
end

# File lib/zadt/HelpModules/Functionality/Geometrics/circle.rb, line 14
def self.show_help_message
  super
  Zadt::ADT::show_circle_help_message
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 9
def area
  dim_check(2)
  Math::PI * (@radius ** 2)
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 14
def circumference
  dim_check(2)
  2 * Math::PI * @radius
end

# File lib/zadt/HelpModules/Functionality/Geometrics/circle.rb, line 4
def help
  Circle.help
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 19
def inspect
  "Circle: #{equation}"
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 25
def circle_equation
  dim_check(2)
  center_point = @center.dup
  coord_names = ["x", "y"]
  center_point.coords.each_with_index do |center_coord, index|
    if center_coord == 0
      # coord_name is fine
    elsif center_coord < 0
      coord_names[index] = "(#{coord_names[index]} + #{-center_coord})"
    else
      coord_names[index] = "(#{coord_names[index]} - #{center_coord})"
    end
  end
  "#{coord_names[0]}^2 + #{coord_names[1]}^2 = #{@radius ** 2}"
end

# File lib/zadt/AbstractDataTypes/Geometrics/circle.rb, line 41
def close_enough(guess, exact)
  range = Array.new
  range[0] = exact *(100.0 - @pct_error)/100.0
  range[1] = exact * (100.0 + @pct_error)/100.0
  guess.between?(range[0], range[1])
end