# File lib/scruffy/layers/base.rb, line 124
      def setup_variables(options = {})
        @color = (preferred_color || options.delete(:color))
        @width, @height = options.delete(:size)
        @min_value, @max_value = options[:min_value], options[:max_value]
        @opacity = options[:opacity] || 1.0
        @complexity = options[:complexity]
      end