ruby-mandelbrot reviews and mentions

• Glimmer DSL for SWT Mandelbrot Fractal
  1 project | dev.to | 26 Feb 2021

  require 'glimmer-dsl-swt' require 'complex' require 'concurrent-ruby' class Mandelbrot attr_accessor :max_iterations def initialize(max_iterations) @max_iterations = max_iterations end def calculate_all(x_array, y_array) thread_pool = Concurrent::FixedThreadPool.new(Concurrent.processor_count) width = x_array.size height = y_array.size pixel_rows_array = Concurrent::Array.new(height) height.times do |y| pixel_rows_array[y] ||= Concurrent::Array.new(width) width.times do |x| thread_pool.post do pixel_rows_array[y][x] = calculate(x_array[x], y_array[y]).last end end end thread_pool.shutdown thread_pool.wait_for_termination pixel_rows_array end # Mandelbrot point calculation implementation # Courtesy of open-source code at: # https://github.com/gotbadger/ruby-mandelbrot def calculate(x,y) base_case = [Complex(x,y), 0] Array.new(max_iterations, base_case).inject(base_case) do |prev ,base| z, itr = prev c, _ = base val = z*z + c itr += 1 unless val.abs < 2 [val, itr] end end end class MandelbrotFractal include Glimmer::UI::CustomShell before_body { @colors = [[0, 0, 0]] + 40.times.map { |i| [255 - i*5, 255 - i*5, 55 + i*5] } @colors = @colors.map {|color_data| rgb(*color_data).swt_color} mandelbrot = Mandelbrot.new(@colors.size - 1) @y_array = (1.0).step(-1,-0.0030).to_a @x_array = (-2.0).step(0.5,0.0030).to_a @height = @y_array.size @width = @x_array.size @pixel_rows_array = mandelbrot.calculate_all(@x_array, @y_array) @image = Image.new(display.swt_display, @width, @height) image_gc = org.eclipse.swt.graphics.GC.new(@image) @height.times { |y| @width.times { |x| new_foreground = @colors[@pixel_rows_array[y][x]] image_gc.foreground = @current_foreground = new_foreground unless new_foreground == @current_foreground image_gc.draw_point x, y } } } body { shell { text 'Mandelbrot Fractal' minimum_size @width, @height + 12 image @image canvas { image(@image, 0, 0) } } } end MandelbrotFractal.launch