text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var logger = require( 'debug' );
  
  
  // VARIABLES //
  
  var debug = logger( 'plot:base:render' );
  
  
  // MAIN //
  
  /**
  * Renders a plot.
  *
  * @private
  * @param {string} [format] - render format
  * @returns {(VTree|string)} virtual tree or a string
  */
  function render( format ) {
  	/* eslint-disable no-invalid-this */
  	var out;
  	var tmp;
  	var fmt;
  
  	tmp = this.renderFormat;
  	if ( arguments.length ) {
  		// Temporarily set the render format:
  		this.renderFormat = format;
  		fmt = format;
  	} else {
  		fmt = tmp;
  	}
  	debug( 'Render format: %s.', this.renderFormat );
  
  	debug( 'Rendering...' );
  	out = this._render( fmt );
  	this.emit( 'render', out );
  
  	if ( arguments.length ) {
  		// Restore the render format:
  		this.renderFormat = tmp;
  	}
  	return out;
  }
  
  
  // EXPORTS //
  
  module.exports = render;
  