1. COGS 121 | 05/14/2015
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2. Overview
● Examples from Website
● Capabilities of LeapMotion
● Basic Coding Structure
● Demo

3. Examples
1. Connect your LeapMotion to your computer
2. Make sure your computer is tracking LeapMotion
3. Try an example from below:
https://developer.leapmotion.com/gallery/category/javascript

4. Positions

5. Capabilities: Hand
LeapMotion can detect:
● which hand is being used (left or right)
● position of your palm
● speed of your palm movement
● direction of where your palm is pointing
● strength of grab and pinch
● scale, rotation, and translation factors

6. Capabilities: Fingers
LeapMotion can detect:
• Type of Finger Bones
metacarpal, proximal, intermediate, and distal
• Position of Finger Bones
• If a finger is extended or not
• Type of Fingers
thumb, index, middle, ring, pinky

7. Capabilities: Fingers
Source: http://en.wikipedia.org/wiki/Phalanx_bone

8. Capabilities: Gestures
Gestures in LeapMotion:
● Circular finger movements
● Swipe
● Screen tap
● Key tap

9. System Architecture

10. LeapMotion: Step 1
● Download SDK from: (sign up may be required)
https://developer.leapmotion.com
● Include all JavaScript Libraries
https://developer.leapmotion.com/downloads/javascript
● You do not need to npm install.

11. LeapMotion: Step 2
● Connect to LeapMotion device
● Leap.loop() function implicitly connects web app with
LeapMotion
● What is options?
● What is frame?

12. Options
● Settings for your LeapMotion connection
● Represented as JSON (or Object)
● Commonly used to enable Gesture
o var options = {enableGestures: true};
● Other options:
o host, port, background,optimizeHMD,frameEventName,
useAllPlugins,and loopWhileDisconnected

13. Frame
● Similar to a parent of all LeapMotion objects
● For example, frame.hands will return an array of
Hands object.
● You may also use frame.gestures to get the
array of Gestures that LeapMotion can offer.

14. Accessing Gesture
Using forEach Loop: Using on() function:

15. Putting it Together
HTML: script.js:
LeapMotion
Libraries

16. Live Demo