/
handlers.js
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/
handlers.js
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// var formidable = require("formidable");
var util = require("util");
var sys = require('sys');
var Pixel = require('adafruit_pixel').Pixel;
var pixels = new Pixel('/dev/spidev0.0', 25);
pixels.all(0, 0, 0);
pixels.sync();
var MAX_LEDS = 25;
var MAX_STEPS = 10;
var animation = {
running: false,
step: 0
};
var leds = [];
var ledBuffer = [];
for (var i = 0; i < MAX_LEDS; i++) {
leds[i] = { id: i, r: 0, g: 0, b: 0 };
ledBuffer[i] = {};
}
// send current leds as json
function renderLeds(request, response) {
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(leds));
response.end();
}
/*
function postLed(request, response) {
console.log("postLed");
var led = {};
var form = new formidable.IncomingForm();
form.on('error', function(err) {
response.writeHead(500, {'content-type': 'text/plain'});
response.end('error:\n\n'+util.inspect(err));
console.log('error: ' + util.inspect(err));
});
form.on('end', function() {
console.log('-> post done');
response.writeHead(200, {'content-type': 'text/plain'});
response.end();
});
form.parse(request, function(err, fields, files) {
console.log("updating led: " + fields.id + ", " + fields.r + ", " + fields.g + ", " + fields.b);
leds[fields.id].r = parseInt(fields.r);
leds[fields.id].g = parseInt(fields.g);
leds[fields.id].b = parseInt(fields.b);
//pixels.set(fields.id, leds[fields.id].r, leds[fields.id].g, leds[fields.id].b);
//pixels.sync();
});
}
*/
// set a single led
function setLed(id, r, g, b) {
var ir = parseInt(r);
var ig = parseInt(g);
var ib = parseInt(b);
leds[id].r = (ir < 0) ? 0 : (ir > 255) ? 255 : ir;
leds[id].g = (ig < 0) ? 0 : (ig > 255) ? 255 : ig;
leds[id].b = (ib < 0) ? 0 : (ib > 255) ? 255 : ib;
pixels.set(id, leds[id].r, leds[id].g, leds[id].b);
pixels.sync();
}
function syncLeds() {
for (var i = 0; i < MAX_LEDS; i++) {
var led = leds[i];
pixels.set(i, led.r, led.g, led.b);
}
pixels.sync();
}
// handle change events on the socket
function changeLed(socket, led) {
setLed(led.id, led.r, led.g, led.b);
// send the changed led to all other clients
socket.broadcast.emit("changed:led", {
id: led.id, r: leds[led.id].r, g: leds[led.id].g, b: leds[led.id].b
});
}
function startAnimation(socket, leds) {
animation.running = true;
animate(socket, leds);
}
function stopAnimation(socket) {
animation.running = false;
animation.step = 0;
for (i = 0; i < leds.length; i++) {
leds[i].r = ledBuffer[i].or;
leds[i].g = ledBuffer[i].og;
leds[i].b = ledBuffer[i].ob;
}
socket.emit("update", leds);
syncLeds();
}
function animate(socket, leds) {
if (!animation.running) {
return;
}
if (animation.step == 0) {
// save old values
for (i = 0; i < leds.length; i++) {
ledBuffer[i].or = leds[i].r;
ledBuffer[i].og = leds[i].g;
ledBuffer[i].ob = leds[i].b;
ledBuffer[i].r = leds[i].r;
ledBuffer[i].g = leds[i].g;
ledBuffer[i].b = leds[i].b;
}
// compute deltas
for (i = 0; i < leds.length-1; i++) {
ledBuffer[i].dr = (ledBuffer[i+1].or - ledBuffer[i].or) / MAX_STEPS;
ledBuffer[i].dg = (ledBuffer[i+1].og - ledBuffer[i].og) / MAX_STEPS;
ledBuffer[i].db = (ledBuffer[i+1].ob - ledBuffer[i].ob) / MAX_STEPS;
}
ledBuffer[leds.length-1].dr = (ledBuffer[0].or - ledBuffer[leds.length-1].or) / MAX_STEPS;
ledBuffer[leds.length-1].dg = (ledBuffer[0].og - ledBuffer[leds.length-1].og) / MAX_STEPS;
ledBuffer[leds.length-1].db = (ledBuffer[0].ob - ledBuffer[leds.length-1].ob) / MAX_STEPS;
animation.step = MAX_STEPS;
socket.emit("update", leds);
socket.broadcast.emit("update", leds);
}
for (i = 0; i < leds.length; i++) {
ledBuffer[i].r += ledBuffer[i].dr;
ledBuffer[i].g += ledBuffer[i].dg;
ledBuffer[i].b += ledBuffer[i].db;
leds[i].r = Math.round(ledBuffer[i].r);
leds[i].g = Math.round(ledBuffer[i].g);
leds[i].b = Math.round(ledBuffer[i].b);
//leds[i].b = Math.max(leds[i].b, 0.0);
//console.log("i: " + i + ", " + leds[i].b);
}
animation.step--;
syncLeds();
if (animation.running) {
setTimeout(function() {
animate(socket, leds);
}, 100);
}
}
// handle socket events
function handleSocket(socket) {
socket.on("change:led", function(data) {
changeLed(socket, data);
});
socket.on("startAnimation", function(data) {
startAnimation(socket, leds);
});
socket.on("stopAnimation", function(data) {
stopAnimation(socket);
});
}
exports.leds = renderLeds;
exports.handleSocket = handleSocket;