Using Create Graphics and Grid methods propane

grid_demo.rb

#!/usr/bin/env jruby
# frozen_string_literal: false
require 'propane'

class GridDemo < Propane::App
  attr_reader :tile # attr_accessor is frowned on in ruby circles
  def settings
    size(700, 100)
  end

  def setup
    sketch_title 'Grid Demo'
    @tile = create_graphics(50, 50)
    background(0)
  end

  def draw
    run_tile
    grid(width, height, 50, 50) do |x, y| # exclusively JRubyArt and propane method
      image(tile, x, y)
    end
  end

  def run_tile
    x = rand(20..tile.width-20)
    y = rand(20..tile.height-20)
    tile.begin_draw
    tile.no_stroke
    tile.fill(0, 20)
    tile.rect(0, 0, tile.width, tile.height)
    tile.fill(255)
    tile.ellipse(x, y, 10, 10)
    tile.end_draw
  end
end

GridDemo.new