Class: CircleGesture

Leap. CircleGesture

The CircleGesture classes represents a circular finger movement.

A circle movement is recognized when the tip of a finger draws a circle within the Leap field of view.

CircleGesture

Circle gestures are continuous. The CircleGesture objects for the gesture have three possible states:

  • start -- The circle gesture has just started. The movement has progressed far enough for the recognizer to classify it as a circle.
  • update -- The circle gesture is continuing.
  • stop -- The circle gesture is finished.

new CircleGesture()

Constructs a new CircleGesture object.

An uninitialized CircleGesture object is considered invalid. Get valid instances of the CircleGesture class from a Frame object.

Source:
  • gesture.js, line 157

Extends

Members

center :Leap.Vector

The center point of the circle within the Leap frame of reference.

Type:
Source:
  • gesture.js, line 183

duration :Number

The elapsed duration of the recognized movement up to the frame containing this Gesture object, in microseconds.

The duration reported for the first Gesture in the sequence (with the start state) will typically be a small positive number since the movement must progress far enough for the Leap to recognize it as an intentional gesture.

Type:
  • Number
Inherited From:
Source:
  • gesture.js, line 107

handIds :Array

The list of hands associated with this Gesture, if any.

If no hands are related to this gesture, the list is empty.

Type:
  • Array
Inherited From:
Source:
  • gesture.js, line 87

id :Number

The gesture ID.

All Gesture objects belonging to the same recognized movement share the same ID value. Use the ID value with the Frame::gesture() method to find updates related to this Gesture object in subsequent frames.

Type:
  • Number
Inherited From:
Source:
  • gesture.js, line 75

normal :Leap.Vector

The normal vector for the circle being traced.

If you draw the circle clockwise, the normal vector points in the same general direction as the pointable object drawing the circle. If you draw the circle counterclockwise, the normal points back toward the pointable. If the angle between the normal and the pointable object drawing the circle is less than 90 degrees, then the circle is clockwise.

   var clockwiseness;
   if (circle.pointable.direction.angleTo(circle.normal) <= PI/4) {
       clockwiseness = "clockwise";
   }
   else
   {
       clockwiseness = "counterclockwise";
   }
Type:
Source:
  • gesture.js, line 191

pointableIds :Array

The list of fingers and tools associated with this Gesture, if any.

If no Pointable objects are related to this gesture, the list is empty.

Type:
  • Array
Inherited From:
Source:
  • gesture.js, line 97

progress :Number

The number of times the finger tip has traversed the circle.

Progress is reported as a positive number of the number. For example, a progress value of .5 indicates that the finger has gone halfway around, while a value of 3 indicates that the finger has gone around the the circle three times.

Progress starts where the circle gesture began. Since the circle must be partially formed before the Leap can recognize it, progress will be greater than zero when a circle gesture first appears in the frame.

Type:
  • Number
Source:
  • gesture.js, line 216

radius :Number

The radius of the circle in mm.

Type:
  • Number
Source:
  • gesture.js, line 234

state :String

The gesture ID.

Recognized movements occur over time and have a beginning, a middle, and an end. The 'state()' attribute reports where in that sequence this Gesture object falls.

Possible values for the state field are:

  • start
  • update
  • stop
Type:
  • String
Inherited From:
Source:
  • gesture.js, line 121

type :String

The gesture type.

Possible values for the type field are:

  • circle
  • swipe
  • screenTap
  • keyTap
Type:
  • String
Inherited From:
Source:
  • gesture.js, line 139