def draw(x, y, z, options = {})
      options = {
          mode: :add,
      }.merge! options

      $window.scale @scale do
        @field.draw x, y, z, options
      end

      nil
    end
def draw(x, y, z, options = {})
      options = {
          mode: :add,
      }.merge! options

      $window.scale @scale do
        @field.draw x, y, z, options
      end

      nil
    end
Draw the field, usually for debugging purposes.
 @see Ashton::Texture#draw