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sense.js
an HTML5 interaction library for mobile browsers
Overview
HTML5 offers a lot of awesome access to hardware data. Sense.js is a library that abstracts away the math and gives developers and designers easy access to some common non-touch gesture interactions with simple javascript callbacks.
Disclaimer
This was made as a part of GreylockU's Hackfest, and will likely see changes to make things better/add more gestures :)
Pull requests and feature suggestions are welcome!
Demo
You can find a demo at http://sense-js.jit.su/
Orientation
A ball rolls around based on your screen position!
Flick
Flick your phone to the right or left to slide a color.
Flip
Flip your phone face down and face up, and a new color appears!
Color Fling
Open this page on multiple devices. Selecting a color and flicking it 'flicks' that color to all other devices.
Scroll
sense.js enabled scroll based on screen tilt
Quickstart
Download sense.js, and refer to it in an html file, and initialize it!
<script src="path/to/sense.js"></script>
<script>
var sense = sense.init();
sense.flick(function(data){
// Your callback code here!
});
</script>
Documentation
sense.orientation([options], callback)
Orientation fires continuously, and emits alpha, beta, and gamma data from the device.
| Options | Description | Default |
|---|---|---|
| alphaThreshold | (number) Threshold for changes in delta | 0 |
| betaThreshold | (number) Threshold for changes in beta | 0 |
| gammaThreshold | (number) Threshold for changes in gamma | 0 |
| radians | (boolean) True to emit values in radians | false |
| Data | Description |
|---|---|
| alpha | (number) degree/radian value for direction the device is pointed |
| beta | (number) degree/radian value for device's front-back tilt |
| gamma | (number) degree/radian value for device's left-right tilt |
Sample Usage:
sense.orientation(function(data){
console.log(data)
});
sense.flick([options], callback)
Flick events fire when the device is rotated quickly left-to-right or right-to-left.
| Options | Description | Default |
|---|---|---|
| interval | (number) the duration in milliseconds to watch for a flick event | 150 |
| sensitivity | (number) multiplier to adjust amount of acceleration required. lower = more sensitive | 1 |
| Data | Description |
|---|---|
| direction | (String) 'left' or 'right' depending on the flick direction |
| magnitude | (number) the magnitude of the acceleration on flick |
Sample Usage:
sense.flick(function(data){
slidePage(data.direction)
});
sense.fling([options], callback)
Fling events fire when the device is rotated quickly in the front-to-back direction, as if being thrown overhand (with the device facing towards you).
| Options | Description | Default |
|---|---|---|
| interval | (number) the duration in milliseconds to watch for a flick event | 150 |
| sensitivity | (number) multiplier to adjust amount of acceleration required. lower = more sensitive | 1 |
| Data | Description |
|---|---|
| magnitude | (number) the magnitude of the acceleration on flick |
Sample Usage:
sense.fling(function(data){
sendFile();
});
sense.flip([options], callback)
Flip events fire when the phone is quickly flipped from face-up to face-down to face-up position.
| Options | Description | Default |
|---|---|---|
| gestureDuration | (number) timespan in milliseconds that the flip event can occur over | 150 |
| Data | Description |
|---|---|
| gamma | (number) the final gamma value after the flip |
Sample Usage:
sense.flip(function(data){
showRandomNumber();
});
sense.addTiltScroll([options])
This one line allows the user to observe the tilt of the user's phone to scroll on a page.
| Options | Description | Default |
|---|---|---|
| maxHorizontalAngle | (number) | 80 |
| maxHorizontalOffset | (number) | 100 |
| maxHorizontalSpeed | (number) | 15 |
| maxVerticalAngle | (number) | 40 |
| maxVerticalOffset | (number) | 100 |
| maxVerticalSpeed | (number) | 15 |
Sample Usage:
sense.addTiltScroll();
Debugging
We can initialize Sense with a debug flag!
var sense = sense.init({debug: true});
The debugger will include a fixed div in the bottom right corner that displays data when events fire. This is particularly useful when debugging on mobile, as you can't use debugger or console.log :(
To start the demo site:
$ npm install
$ npm start