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* @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' );
var vdom2html = require( 'vdom-to-html' );
var renderSVG = require( './svg' );
var validate = require( './validate.js' );
// VARIABLES //
var debug = logger( 'plot: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( 'Validating render state...' );
validate( this );
debug( 'Render format: %s.', this.renderFormat );
debug( 'Rendering...' );
if ( this._engine === 'svg' ) {
out = renderSVG( this );
// Default render format is virtual DOM.
if ( fmt === 'html' ) {
out = vdom2html( out );
}
this.emit( 'render', out );
}
if ( arguments.length ) {
// Restore the render format:
this.renderFormat = tmp;
}
return out;
}
// EXPORTS //
module.exports = render;
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