node-red-contrib-ledmatrix/02-ledtext.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 = "ppmlabel -color \"{{{color}}}\" -size {{size}} -x {{x}} -y {{y}} -t \"{{{text}}}\" {{{src}}} 2> {{{log}}} ";
    var CMD = "convert -size 1000x16 -font {{{font}}} canvas:black -pointsize {{size}} -channel RGBA -fill \"{{{color}}}\" -draw \"text {{x}},{{y}} \\\"{{{text}}}\\\"\" png8:{{{srcPng}}} 2> {{{log}}}";
    CMD += "\nconvert {{{srcPng}}} -compress none {{{src}}} 2> {{{log}}}";
    CMD += "\npnmcrop -right {{{src}}}";
    CMD += "{{#intensity}} | ppmbrighten -v -{{intensity}} 2> {{{log}}} {{/intensity}}"
    CMD += " > tmp;"
    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";

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

        this.text = n.text;

        var node = this;
		var size = 3;
        this.on('input', function (msg) {
			if(typeof(msg.textsize) != "undefined"){size = msg.textsize};
			if (size < 1){
				size = 1;
			}
			if (size > 5){
				size = 5;
			}

			var text = ""//default text
			if(typeof(node.text) != "undefined"){text = node.text};
			if(typeof(msg.payload) != "undefined"){text = msg.payload};
			size = parseInt(size, 10) + 10; // +5
            var params = {
                cat: msg.alongside || 0,
                color: msg.color || "white",
                text: text,
                intensity: msg.intensity ? 100 - msg.intensity : 60,
                size: size||11, // 6
                font: msg.font || "Roboto-Medium",
                x: typeof msg.x == "undefined" || msg.x == null ? 0 : msg.x,
                y: typeof msg.y == "undefined" || msg.y == null ? 12 : msg.y,
                src: "/root/thethingbox/rpi-rgb-led-matrix-sh/bg.ppm",
                srcPng: "/root/thethingbox/rpi-rgb-led-matrix-sh/bg.png",
                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("ledtext", ledtext);

}