Source: org/terraswarm/accessor/accessors/web/image/ImageDisplay.js

// Display an image on the console.
//
// Copyright (c) 2017 The Regents of the University of California.
// All rights reserved.
//
// Permission is hereby granted, without written agreement and without
// license or royalty fees, to use, copy, modify, and distribute this
// software and its documentation for any purpose, provided that the above
// copyright notice and the following two paragraphs appear in all copies
// of this software.
//
// IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
// ENHANCEMENTS, OR MODIFICATIONS.
//

/** Display an image on the console.
 *  The image is passed through to the output in case a model wishes to ensure
 *  that the image has been displayed before something else happens.
 *
 *  @accessor image/ImageDisplay
 *  @input input The image to display.
 *  @output output The image to display.
 *  @author Christopher Brooks
 *  @version $$Id$$
 */

// Stop extra messages from jslint.  Note that there should be no
// space between the / and the * and global.
/*globals console, error, exports, require */
/*jshint globalstrict: true*/
"use strict";

var imageDisplay = require('@accessors-modules/image-display');
var display = null;

exports.setup = function () {
    this.input('input');
    this.output('output');
};

exports.initialize = function () {
    if (display === null) {
        display = new imageDisplay.ImageDisplay();
    }

    this.addInputHandler('input', function () {
        var inputValue = this.get('input');
        display.displayImage(inputValue);
        this.send('output', inputValue);
    });
};