How to use the kinect2.JointType function in kinect2

// get closest body
            var closestBodyIndex = getClosestBodyIndex(frame.body.bodies);
            if(closestBodyIndex !== trackedBodyIndex) {
              if(closestBodyIndex > -1) {
                kinect.trackPixelsForBodyIndices([closestBodyIndex]);
              } else {
                kinect.trackPixelsForBodyIndices(false);
              }
            }
            else {
              if(closestBodyIndex > -1) {
                //measure distance from floor
                if(frame.body.floorClipPlane)
                {
                  //get position of left hand
                  var joint = frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.handLeft];

                  //https://social.msdn.microsoft.com/Forums/en-US/594cf9ed-3fa6-4700-872c-68054cac5bf0/angle-of-kinect-device-and-effect-on-xyz-positional-data?forum=kinectv2sdk
                  var cameraAngleRadians= Math.atan(frame.body.floorClipPlane.z / frame.body.floorClipPlane.y);
                  var cosCameraAngle = Math.cos(cameraAngleRadians);
                  var sinCameraAngle = Math.sin(cameraAngleRadians);
                  var yprime = joint.cameraY * cosCameraAngle + joint.cameraZ * sinCameraAngle;
                  var jointDistanceFromFloor = frame.body.floorClipPlane.w + yprime;

                  //show height in canvas
                  showHeight(context, joint, jointDistanceFromFloor);
                  showHeight(outputContext, joint, jointDistanceFromFloor);

                  //send height data to remote
                  var jointDataToSend = {joint: joint, distance: jointDistanceFromFloor};

                  sendToPeer('floorHeightTracker', jointDataToSend);

function getClosestBodyIndex(bodies) {
  var closestZ = Number.MAX_VALUE;
  var closestBodyIndex = -1;
  for(var i = 0; i < bodies.length; i++) {
    if(bodies[i].tracked && bodies[i].joints[Kinect2.JointType.spineMid].cameraZ < closestZ) {
      closestZ = bodies[i].joints[Kinect2.JointType.spineMid].cameraZ;
      closestBodyIndex = i;
    }
  }
  return closestBodyIndex;
}

}
                }

                var pixelWidth = calculatePixelWidth(frame.bodyIndexColor.horizontalFieldOfView, frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.spineMid].cameraZ * 1000);
                scale = 0.3 * pixelWidth;

                //head joint is in middle of head, add area (y-distance from neck to head joint) above
                topJoint = {
                  colorX: topJoint.colorX,
                  colorY: Math.min(topJoint.colorY, frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.head].colorY - (frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.neck].colorY - frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.head].colorY))
                };
                var srcRect = {
                  x: leftJoint.colorX * canvas.width,
                  y: topJoint.colorY * canvas.height,
                  width: (rightJoint.colorX - leftJoint.colorX) * canvas.width,
                  height: (frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.spineMid].floorColorY - topJoint.colorY) * canvas.height
                };
                var dstRect = {
                  x: outputCanvas.width * 0.5,
                  y: outputCanvas.height - (srcRect.height * scale),
                  width: srcRect.width * scale,
                  height: srcRect.height * scale
                };
                //center the user horizontally - is not minus half width of image as user might reach to one side or the other
                //do minus the space on the left size of the spine
                var spaceLeft = frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.spineMid].colorX - leftJoint.colorX;
                dstRect.x -= (spaceLeft * canvas.width * scale);
                
                newPixelData = frame.bodyIndexColor.bodies[closestBodyIndex].buffer;

                for (var i = 0; i < imageDataSize; i++) {
                  imageDataArray[i] = newPixelData[i];

joint.depthY * inCanvas.height,
        10,
        10
      );
    }

    //draw hand states
    updateHandState(
      inContext,
      body.leftHandState,
      body.joints[Kinect2.JointType.handLeft]
    );
    updateHandState(
      inContext,
      body.rightHandState,
      body.joints[Kinect2.JointType.handRight]
    );
  }
}

kinect.on('multiSourceFrame', function(frame){
    var closestBodyIndex = getClosestBodyIndex(frame.body.bodies);
    if(closestBodyIndex !== trackedBodyIndex) {
      if(closestBodyIndex > -1) {
        kinect.trackPixelsForBodyIndices([closestBodyIndex]);
      } else {
        kinect.trackPixelsForBodyIndices(false);
      }
    }
    else {
      if(closestBodyIndex > -1) {
        //get body ground position - when use jumps this point stays on the ground
        if(frame.body.bodies[closestBodyIndex].joints[Kinect2.JointType.spineMid].floorColorY)
        {
          //calculate the source rectangle
          var leftJoint = frame.body.bodies[closestBodyIndex].joints[0],
              topJoint = frame.body.bodies[closestBodyIndex].joints[0],
              rightJoint = frame.body.bodies[closestBodyIndex].joints[0];
          for(var i = 1; i < frame.body.bodies[closestBodyIndex].joints.length; i++) {
            var joint = frame.body.bodies[closestBodyIndex].joints[i];
            if(joint.colorX < leftJoint.colorX) {
              leftJoint = joint;
            }
            if(joint.colorX > rightJoint.colorX) {
              rightJoint = joint;
            }
            if(joint.colorY < topJoint.colorY) {
              topJoint = joint;
            }

for (var jointType in body.joints) {
      var joint = body.joints[jointType];
      inContext.fillStyle = colors[index];
      inContext.fillRect(
        joint.depthX * inCanvas.width,
        joint.depthY * inCanvas.height,
        10,
        10
      );
    }

    //draw hand states
    updateHandState(
      inContext,
      body.leftHandState,
      body.joints[Kinect2.JointType.handLeft]
    );
    updateHandState(
      inContext,
      body.rightHandState,
      body.joints[Kinect2.JointType.handRight]
    );
  }
}