require "gosu"

module Gosu

	def self.draw_circle(x, y, r, c, z = 0, thickness = 1, sides = nil, mode = :default)

		# Unless specified, calculate a nice-looking "minimum" number of sides
		# sides = (r + Math::sqrt(r * 0.1) * 4).floor if sides.nil?
		sides = (2.0 * r * Math::PI).floor if sides.nil?

		# Calculate the inner and outer offsets from the "true" circle
		offs = thickness * 0.5
		r_in = r - offs
		r_out = r + offs

		# Calculate the angular increment
		ai = 360.0 / sides.to_f

		translate(x, y) {
			ang = 0
			while ang <= 359.9 do
				draw_quad(
					Gosu.offset_x(ang, r_in), Gosu.offset_y(ang, r_in), c,
					Gosu.offset_x(ang, r_out), Gosu.offset_y(ang, r_out), c,
					Gosu.offset_x(ang + ai, r_in), Gosu.offset_y(ang + ai, r_in), c,
					Gosu.offset_x(ang + ai, r_out), Gosu.offset_y(ang + ai, r_out), c,
					z, mode
				)
				ang += ai
			end
		}

	end

	class Window

		def draw_circle(x, y, r, c, z = 0, thickness = 1, sides = nil, mode = :default)
			Gosu::draw_circle(x, y, r, c, z, thickness, sides, mode)
		end

	end # Window class

end # Gosu module