node-red-contrib-ledmatrix/02-ledpicture.js

Contains the nodes used in TimeSquAir to use the LEDMatrix library

/**
	Copyright © 2015 Digital Airways (www.DigitalAirways.com)
	This work is free. You can redistribute it and/or modify it under the
	terms of the Do What The Fuck You Want To Public License, Version 2,
	as published by Sam Hocevar. 
	See http://www.wtfpl.net for more details.
 **/

module.exports = function(RED) {
    "use strict";
    var Mustache = require("mustache");

    var CMD = "{{#url}}wget {{{src}}} -O tmphttp > {{{log}}};\n{{/url}}";
    CMD += "case `file {{#url}}tmphttp{{/url}}{{^url}}{{{src}}}{{/url}}` in\n";
    CMD += "\t*JPEG*) jpegtopnm {{#url}}tmphttp{{/url}}{{^url}}{{{src}}}{{/url}} | pnmscale -ysize 16 {{#intensity}}| ppmbrighten -v -{{intensity}} 2>> {{{log}}} {{/intensity}} > tmp;;\n";
    CMD += "\t*PNG*) pngtopnm -background black {{#url}}tmphttp{{/url}}{{^url}}{{{src}}}{{/url}} | pnmscale -ysize 16 {{#intensity}}| ppmbrighten -v -{{intensity}} 2>> {{{log}}} {{/intensity}} > tmp;;\n";
    CMD += "\t*PPM*) cat {{#url}}tmphttp{{/url}}{{^url}}{{{src}}}{{/url}} | pnmscale -ysize 16 {{#intensity}}| ppmbrighten -v -{{intensity}} 2>> {{{log}}} {{/intensity}} > tmp;;\n";
    CMD += "esac\n";
    CMD += "\nif [ -e {{{dest}}} ]\n";
    CMD += "then\n";
    CMD += "\tif [ {{cat}} -eq 0 ]\n";
    CMD += "\tthen\n";
    CMD += "\t\tpnmcat -l {{{dest}}} /root/thethingbox/rpi-rgb-led-matrix-sh/col.ppm tmp > tmp2;\n";
    CMD += "\telse\n";
    CMD += "\t\tpnmcat -l {{{dest}}} tmp > tmp2;\n";
    CMD += "\tfi\n";
    CMD += "\tmv -f tmp2 {{{dest}}};\n\trm tmp;\n";
    CMD += "else\n";
    CMD += "\tmv -f tmp {{{dest}}}\n";
    CMD += "fi\n";
    CMD += "{{#url}}rm tmphttp;\n{{/url}}";

    function ledpicture(n) {
        RED.nodes.createNode(this,n);

        this.text = n.text;

        var node = this;

        this.on('input', function (msg) {
            if(!msg.picture || msg.picture == "") {
                return node.send(msg);
            }
            var picl = msg.picture.length;
            // var params = {
            //     url: msg.picture.indexOf("http://") == 0 || msg.picture.indexOf("https://") == 0,
            //     jpeg: msg.picture.indexOf(".jpeg") == picl-5 || msg.picture.indexOf(".jpg") == picl-4,
            //     png: msg.picture.indexOf(".png") == picl-4,
            //     src: msg.picture,
            //     dest: "{{{finalppm}}}",
            //     log: "/root/userdir/ledmatrix/log.txt"
            // }
            // params.ppm = !(params.jpeg || params.png);
            var params = {
                cat: msg.alongside || 0,
                url: msg.picture.indexOf("http://") == 0 || msg.picture.indexOf("https://") == 0,
                src: msg.picture,
                intensity: msg.intensity ? 100 - msg.intensity : null,
                dest: "{{{finalppm}}}",
                log: "/root/userdir/ledmatrix/log.txt"
            }

            var cmd = Mustache.render(CMD, params);
            if(typeof msg.cmd != "string") {
                msg.cmd = "";       
            }

            msg.cmd += cmd;
            node.send(msg);
        });
    }
    RED.nodes.registerType("ledpicture", ledpicture);

}