paper$Container.on("wheel", function (e) {

  var event = e.originalEvent,
      deltaY = event.deltaY,
      curentScale = paper.scale(),
      offsetX = event.pageX - paper.$el.offset().left,
      offsetY = event.pageY - paper.$el.offset().top,
      maxScale = 1.5, minScale = 0.5,
      newScale, modifier, localPoint;

  if (deltaY < 0 && curentScale.sx < maxScale) {
    modifier = 0.1;
  } else if (deltaY > 0 && curentScale.sx > minScale) {
    modifier = -0.1;
  } else {
    return;
  }

  newScale = (curentScale.sx + modifier).toFixed(1);

  localPoint = paper.clientToLocalPoint(event.clientX, event.clientY);
  paper.scale(newScale);

  paper.translate(
    offsetX - localPoint.x * newScale,
    offsetY - localPoint.y * newScale
  );
});