DragonRuby game starter - Tile board (square tiles) - simple base for a boardgame

main.rb

class Color
  RED   = [200, 128, 128]
  BLUE  = [128, 128, 200]
  GREEN = [128, 200, 128]
  WHITE = [200, 200, 200]
  GREY  = [128, 128, 128]
  BLACK = [20,  20,  20 ]
end

class World
  PADDING = 46
  PADDING_BOTTOM = 20
end

class Tile
  DIMENSION = 92

  attr_accessor :x, :y, :width, :height, :color

  def initialize(x:, y:, width:, height:, color:)
    @x = x
    @y = y
    @width = width
    @height = height
    @color = color
  end

  def self.gen(x:, y:, width: DIMENSION, height: DIMENSION, color: Color::RED)
    padding = World::PADDING
    padding_x, padding_y = padding, padding+World::PADDING_BOTTOM
    x += padding_x
    y += padding_y
    new(x: x, y: y, width: width, height: height, color: color)
  end

  def to_a
    [x, y, width, height] << color
  end

  alias :rect :to_a

  def serialize
    { x: x, y: y, width: width, height: height, color: color }
  end

  alias :to_h :serialize

  def inspect
    serialize.to_s
  end

  def to_s
    serialize.to_s
  end

end

class SquareTileGame
  attr_gtk

  def generate_tiles
    tiles = []
    rows = 6
    cols = 12
    size = 100

    rows.times do |row|
      cols.times do |col|
        x = col * size
        y = row * size
        tiles << Tile.gen(x: x, y: y)
      end
    end
    tiles
  end

  def defaults
    state.tiles ||= generate_tiles
  end

  def input
    return unless inputs.click
    tile_clicked = state.tiles.find do |tile|
      inputs.click.inside_rect? tile.rect
    end
    return unless tile_clicked

    if tile_clicked.color == Color::BLUE
      tile_clicked.color = Color::RED
    else
      tile_clicked.color = Color::BLUE
    end
  end

  def tick
    defaults
    input
    render
  end

  def render
    args.outputs.solids << state.tiles.map(&:to_a)
  end

end

def main!
  GAME = SquareTileGame.new

  def tick args
    GAME.args = args
    GAME.tick
  end

  $gtk.reset
end

main!