# File lib/bio/graphics/glyphs/triangle.rb, line 20
    def draw
      raise "Start and stop are not the same (necessary if you want triangle glyphs)" if @subfeature.start != @subfeature.stop
      
      arrow(@feature_context,:north, self.left_pixel + Bio::Graphics::FEATURE_ARROW_LENGTH, 0, Bio::Graphics::FEATURE_ARROW_LENGTH)
      @feature_context.close_path.stroke
    end