My first ruby plugin to generate an Archimedean spiral is executing too slowly

Developers Ruby API
7

thank you bobecka,

That is extremely fast code. I have changed it a bit because I needed two spirals with 4 mm in between. Also the variable ‘a’ is not the distance between revolutions but the distance from the center to the start of the spiral. I have not figured out how to set the distance between revolutions yet.

require 'sketchup.rb'

module Spiral
    module DrawSpiral
    def self.create_spiral
        model = Sketchup.active_model
        model.start_operation('create spiral', true)

		# Setting the parameters of the Archimedean spiral
		a1 = 10.mm # Starting point from the center
		a2 = 14.mm # Starting point from the center
		b = 0.1 # Angular step

		num_points = 2000
		theta = 0

		# Create an array to store spiral points
		points1 = []
		points2 = []

		# Calculate the coordinates of the spiral points
		num_points.times do
  			r1 = a1 + b * theta
  			r2 = a2 + b * theta
  			x1 = r1 * Math.cos(theta)
  			y1 = r1 * Math.sin(theta)
  			x2 = r2 * Math.cos(theta)
  			y2 = r2 * Math.sin(theta)
  			z = 0 # We are building a spiral in the XY plane
  			points1 << [x1, y1, z]
  			points2 << [x2, y2, z]
	
  			theta += b
		end

		# We build lines between the points of the spiral
		model.entities.add_curve(points1)
		model.entities.add_curve(points2)
        model.commit_operation
    end # def

    unless file_loaded?(__FILE__)
        menu = UI.menu('Plugins')
        menu.add_item('Create spiral') {
            self.create_spiral
        }
        file_loaded(__FILE__)
    end # unless

  end # module DrawSpiral
end # module Spiral