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unicorn.js
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unicorn.js
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module.exports = function(RED) {
"use strict";
var fs = require('fs');
var PNG = require('pngjs').PNG;
var spawn = require('child_process').spawn;
var hatCommand = __dirname+'/unihat';
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//RED.log.info(RED._("rpi-gpio.errors.ignorenode"));
throw "Info : "+RED._("rpi-gpio.errors.ignorenode");
}
if (!fs.existsSync('/usr/local/lib/python2.7/dist-packages/unicornhat.py')) {
RED.log.warn("Can't find Unicorn HAT python libraries");
throw "Warning : Can't find Unicorn HAT python libraries";
}
if ( !(1 & parseInt ((fs.statSync(hatCommand).mode & parseInt ("777", 8)).toString (8)[0]) )) {
RED.log.error(hatCommand + " command is not executable");
throw "Error : "+RED._("rpi-gpio.errors.mustbeexecutable");
}
// the magic to make python print stuff immediately
process.env.PYTHONUNBUFFERED = 1;
function UnicornHatNode(n) {
RED.nodes.createNode(this,n);
this.png = n.png;
this.bright = n.bright || 20;
this.items = {};
var node = this;
var pic = new Buffer(192);
pic.fill(0);
var ready = false;
if (node.png) {
if (node.png.split(",").length === 3) {
var c = node.png.split(",");
for (var i=0; i<192; i++) {
pic[i] = c[0];
pic[i+1] = c[1];
pic[i+2] = c[2];
i += 2;
}
ready = true;
}
else {
try {
var file = fs.readFileSync(node.png);
new PNG().parse( file, function(error, data) {
if (error) {
node.warn("error reading : "+node.png);
ready = true;
}
else {
var pix = data.data;
var j=0;
for (var i=0; i<192; i++) {
pic[i] = pix[j];
pic[i+1] = pix[j+1];
pic[i+2] = pix[j+2];
i += 2;
j += 4;
}
ready = true;
}
});
}
catch(e) {
node.warn("error loading : "+node.png);
ready = true;
}
}
}
else { ready = true; }
function inputlistener(msg) {
if (typeof msg.payload === "string") {
var a,b,i,j,x,y;
msg.payload = msg.payload.replace('"','');
var s = msg.payload.toUpperCase().split(",");
var doDraw = true;
if (s.length === 1) {
if ((s[0] == "CLS") || (s[0] == "CLR") || (s[0] == "CLEAR")) {
//console.log("CLEAR")
pic.fill(0);
node.items = {};
}
if ((s[0] == "DEL") || (s[0] == "DELETE")) {
//console.log("DELETE")
node.items = {};
}
}
else if (s.length === 2) {
if (s[0] === "BRIGHTNESS") {
//console.log("BRIGHTNESS",s[1])
node.child.stdin.write("B"+s[1]+"\n");
}
if (s[0] === "ROTATE") {
//console.log("ROTATE",s[1])
node.child.stdin.write("R"+s[1]+"\n");
}
}
else if (s.length === 3) {
//console.log("BACKGROUND",s)
for (i=0; i<192; i++) {
pic[i] = s[0];
pic[i+1] = s[1];
pic[i+2] = s[2];
i += 2;
}
}
else if (s.length % 5 === 0) { // handles pixel updates
if (msg.topic) {
node.items[msg.topic] = msg.payload;
}
else {
node.child.stdin.write('P'+msg.payload+'\n');
doDraw = false;
x = [];
y = [];
for (a = 0; a < s.length; a++) {
//console.log("PIXELS",a);
if (s[a] === "*") {
x[0] = 0;
x[1] = 7;
}
else if (s[a].indexOf("-") !== -1) {
x = s[a].split("-").sort();
}
else { x[0] = x[1] = s[a]; }
if (s[a+1] === "*") {
y[0] = 0;
y[1] = 7;
}
else if (s[a+1].indexOf("-") !== -1) {
y = s[a+1].split("-").sort();
}
else { y[0] = y[1] = s[a+1]; }
for (j = y[0]; j <= y[1]; j++) {
for (i = x[0]; i <= x[1]; i++) {
pic[i*3+j*24] = s[a+2];
pic[i*3+j*24+1] = s[a+3];
pic[i*3+j*24+2] = s[a+4];
}
}
a += 4;
}
}
}
else if (s.length === 192) { // handle complete buffer refresh.
for (var h=0; h<192; h++) {
pic[h] = s[h];
pic[h+1] = s[h+1];
pic[h+2] = s[h+2];
h += 2;
}
}
else {
if (node.items.hasOwnProperty(msg.topic)) { delete node.items[msg.topic]; }
}
if (doDraw) {
var pixels = new Buffer(192);
pic.copy(pixels);
for (var p in node.items) {
if (node.items.hasOwnProperty(p)) {
b = node.items[p].split(",");
x = [];
y = [];
for (a = 0; a < b.length; a++) {
if (b[a] === "*") {
x[0] = 0;
x[1] = 7;
}
else if (b[a].indexOf("-") !== -1) {
x = b[a].split("-").sort();
}
else { x[0] = x[1] = b[a]; }
if (b[a+1] === "*") {
y[0] = 0;
y[1] = 7;
}
else if (b[a+1].indexOf("-") !== -1) {
y = b[a+1].split("-").sort();
}
else { y[0] = y[1] = b[a+1]; }
for (j = y[0]; j <= y[1]; j++) {
for (i = x[0]; i <= x[1]; i++) {
pixels[i*3+j*24] = b[a+2];
pixels[i*3+j*24+1] = b[a+3];
pixels[i*3+j*24+2] = b[a+4];
}
}
a += 4;
}
}
}
node.child.stdin.write(pixels);
node.child.stdin.write("\n");
}
}
else { node.warn("Input not a string"); }
}
node.child = spawn(hatCommand, [node.bright]);
node.status({fill:"green",shape:"dot",text:"ok"});
node.on("input", inputlistener);
node.child.stdout.on('data', function (data) {
if (RED.settings.verbose) { node.log("out: "+data+" :"); }
});
node.child.stderr.on('data', function (data) {
if (RED.settings.verbose) { node.log("err: "+data+" :"); }
});
node.child.on('close', function () {
node.child = null;
if (RED.settings.verbose) { node.log(RED._("rpi-gpio.status.closed")); }
if (node.done) {
node.status({fill:"grey",shape:"ring",text:"closed"});
node.done();
}
else { node.status({fill:"red",shape:"ring",text:"stopped"}); }
});
node.child.on('error', function (err) {
if (err.errno === "ENOENT") { node.error(RED._("rpi-gpio.errors.commandnotfound")); }
else if (err.errno === "EACCES") { node.error(RED._("rpi-gpio.errors.commandnotexecutable")); }
else { node.error(RED._("rpi-gpio.errors.error")+': ' + err.errno); }
});
node.on("close", function(done) {
node.status({fill:"grey",shape:"ring",text:"closed"});
if (node.tout) { clearTimeout(node.tout); }
if (node.child != null) {
node.done = done;
node.child.kill('SIGKILL');
}
else { done(); }
});
var nowready = function() {
node.tout = setTimeout( function() {
if (ready) { inputlistener({payload:"0"}); }
else { nowready(); }
}, 100);
}
nowready();
}
RED.nodes.registerType("rpi-unicorn",UnicornHatNode);
}