使用Leap Motion检测滑动手势方向

Question

我正在尝试使用javascript API简单地使用Leap Motion获取滑动手势的方向.我的代码是:

$(document).ready(function() {
    controller = new Leap.Controller("ws://localhost:6437/");
    listener = new Leap.Listener();

    listener.onFrame = function(controller) {
        var frame = controller.frame();
        var hands = frame.hands();
        var pointables = frame.pointables();

        var gestures = frame.gestures();

        $("#rotationAxis").text(pointables.length);
        $("#gestureDetected").text(gestures[0]);
    }

    controller.addListener(listener);
    controller.enableGesture("swipe", true);
    listener.onConnect = function(controller) {
        // calibrate = new Leap.Calibrate(controller);
        // calibrate.onComplete = function(screen){
        // }
    }
});

我可以从数组中获取当前手势,但无法获取类型或方向.有任何想法吗？

谢谢.

Answer 1

如果您关心向右,向左,向上或向下,您可以比较滑动方向向量的水平和垂直坐标的绝对值,以查看滑动是更垂直还是更水平(然后将相关坐标与零进行比较)要查看滑动是向右还是向左,向上还是向下):

// Setup Leap loop with frame callback function
var controllerOptions = {enableGestures: true};

Leap.loop(controllerOptions, function(frame) {

  if (frame.gestures.length > 0) {
    for (var i = 0; i < frame.gestures.length; i++) {
      var gesture = frame.gestures[i];

      if (gesture.type == "swipe") {
          //Classify swipe as either horizontal or vertical
          var isHorizontal = Math.abs(gesture.direction[0]) > Math.abs(gesture.direction[1]);
          //Classify as right-left or up-down
          if(isHorizontal){
              if(gesture.direction[0] > 0){
                  swipeDirection = "right";
              } else {
                  swipeDirection = "left";
              }
          } else { //vertical
              if(gesture.direction[1] > 0){
                  swipeDirection = "up";
              } else {
                  swipeDirection = "down";
              }                  
          }
       }
     }
  }

})

通过稍微复杂的比较,您可以将滑动分类为向前或向后.

Answer 2

经过快速分析，我找到了您要查找的信息：

var gestureType = frame.gestures[0].type;

if (gestureType === "swipe")
{
    if (frame.gestures[0].direction[0] > 0)
        console.log(">>> swipe >>>");
    else
        console.log("<<< swipe <<<");
}