Helpers

[MatheusRich]

• Weighted sample

class Hash
  def wsample
    max_by { |_, w|
      next -Float::INFINITY if w == 0

      rand**(1.0 / w)
    }&.first # first to return just the key
  end

  def wsample_strict
    total_probability = values.sum
    raise ArgumentError, "Weights must add up to 1, but they add up to #{total_probability}." if total_probability != 1

    wsample
  end
end

• bresenham's line
• @canvas.draw_line/draw_rect_outline