HTML5开发Kinect体感游戏的实例应用

npm install kinect2

var Kinect2 = require('../../lib/kinect2'),
  express = require('express'),
  app = express(),
  server = require('http').createServer(app),
  io = require('socket.io').listen(server);
 
var kinect = new Kinect2();
// 打开kinect
if(kinect.open()) {
  // 监听8000端口
  server.listen(8000);
  // 指定请求指向根目录
  app.get('/', function(req, res) {
    res.sendFile(__dirname + '/public/index.html');
  });
  // 将骨骼数据发送给浏览器端
  kinect.on('bodyFrame', function(bodyFrame){
    io.sockets.emit('bodyFrame', bodyFrame);
  });
  // 开始读取骨骼数据
  kinect.openBodyReader();
}

var socket = io.connect('/');
var ctx = canvas.getContext('2d');
socket.on('bodyFrame', function(bodyFrame){
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  var index = 0;
  // 遍历所有骨骼数据
  bodyFrame.bodies.forEach(function(body){
    if(body.tracked) {
      for(var jointType in body.joints) {
        var joint = body.joints[jointType];
        ctx.fillStyle = colors[index];
        // 如果骨骼节点为脊椎中点
        if(jointType == 1) {
          ctx.fillStyle = colors[2];
        }
        ctx.fillRect(joint.depthX * 512, joint.depthY * 424, 10, 10);
      }
      // 识别左右手手势
      updateHandState(body.leftHandState, body.joints[7]);
      updateHandState(body.rightHandState, body.joints[11]);
      index++;
    }
  });
});

kinect.on('bodyFrame', function(bodyFrame){}); //还有哪些数据类型呢？

body.joints[11] // joints包括哪些呢？

body [object] {
 bodyIndex [number]：索引，允许6人
 joints [array]：骨骼节点，包含坐标信息，颜色信息
 leftHandState [number]：左手手势
 rightHandState [number]：右手手势
 tracked [boolean]：是否捕获到
 trackingId
} 

var emitColorFrame = false;
io.sockets.on('connection', function (socket){
  socket.on('startColorFrame', function(data){
    emitColorFrame = true;
  });
});
kinect.on('multiSourceFrame', function(frame){
 
  // 发送玩家骨骼数据
  io.sockets.emit('bodyFrame', frame.body);
 
  // 玩家拍照
  if(emitColorFrame) {
    var compression = 1;
    var origWidth = 1920;
    var origHeight = 1080;
    var origLength = 4 * origWidth * origHeight;
    var compressedWidth = origWidth / compression;
    var compressedHeight = origHeight / compression;
    var resizedLength = 4 * compressedWidth * compressedHeight;
    var resizedBuffer = new Buffer(resizedLength);
    // ...
    // 照片数据过大，需要压缩提高传输性能
    zlib.deflate(resizedBuffer, function(err, result){
      if(!err) {
        var buffer = result.toString('base64');
        io.sockets.emit('colorFrame', buffer);
      }
    });    
    emitColorFrame = false;
  }
});
kinect.openMultiSourceReader({
  frameTypes: Kinect2.FrameType.body | Kinect2.FrameType.color
});

(function(){
  importScripts('pako.inflate.min.js');
 
  var imageData;
  function init() {
    addEventListener('message', function (event) {
      switch (event.data.message) {
        case "setImageData":
          imageData = event.data.imageData;
          break;
        case "processImageData":
          processImageData(event.data.imageBuffer);
          break;
      }
    });
  }
  function processImageData(compressedData) {
    var imageBuffer = pako.inflate(atob(compressedData));
    var pixelArray = imageData.data;
    var newPixelData = new Uint8Array(imageBuffer);
    var imageDataSize = imageData.data.length;
    for (var i = 0; i < imageDataSize; i++) {
      imageData.data[i] = newPixelData[i];
    }
    for(var x = 0; x < 1920; x++) {
      for(var y = 0; y < 1080; y++) {
        var idx = (x + y * 1920) * 4;
        var r = imageData.data[idx + 0];
        var g = imageData.data[idx + 1];
        var b = imageData.data[idx + 2];
      }
    }
    self.postMessage({ "message": "imageReady", "imageData": imageData });
  }
  init();
})(); 

var tracks = this.tracks;
var len = tracks.length;
 
// 数据过滤
if(tracks[len-1] !== window.undefined) {
  if(Math.abs(n - tracks[len-1]) > 0.2) {
    return;
  }
}
this.tracks.push(n);

// 保留5个数据
if(this.tracks.length > 5) {
  this.tracks.shift();
} else {
  return;
}
 
// 位移总量
var dis = 0;
for(var i = 1; i < this.tracks.length; i++) {
  dis += this.tracks[i] - this.tracks[i-1];
}
if(Math.abs(dis) < 0.01) {
  this.stand();
} else {
  if(this.tracks[4] > this.tracks[3]) {
    this.turnRight();
  } else {
    this.turnLeft();
  }
  this.run();
}