Positions

Fingers:

Positions of the tips of the fingers:

//finger from 0 to 4 are, in order: thumb, index, middle, ring and pinky
frame.fingers[0].tipPosition

• thumb …
• index …
• middle …
• ring …
• pinky …

The positions can be used to compute distances between the tips.

distance = function(a,b) {
var x = a[0]-b[0]
var y = a[1]-b[1]
var z = a[2]-b[2]
x *= x
y *= y
z *= z
return Math.sqrt(x+y+z)
}
distance(frame.fingers[0].tipPosition, frame.fingers[1].tipPosition);

Distance between the tip of the finger and thumb: …

Hands

Position of the Palm of the hand

frame.hands[0].palmPosition;

Position of the first hand:

Type of hand (right/left):

frame.hands[0].type;

First hand I’ve seen is: 

Indication of pinch:

frame.hands[0].pinchStrength;

Pinch index: 

To investigate other information available, which depends on the version of the Leapmotion software you are running, you can dump the “hands” info to the console.

console.log(frame.hands[0])