A vanilla virtual joystick for touch capable interfaces
Table Of Contents
- Install
- Demo
- Usage
- Options
options.zone
defaults to 'body'options.color
defaults to 'white'options.size
defaults to 100options.threshold
defaults to 0.1options.fadeTime
defaults to 250options.multitouch
defaults to falseoptions.maxNumberOfNipples
defaults to 1options.dataOnly
defaults to falseoptions.position
defaults to{top: 0, left: 0}
options.mode
defaults to 'dynamic'.options.restJoystick
defaults to trueoptions.restOpacity
defaults to 0.5options.catchDistance
defaults to 200
- API
- Events
- Contributing
Install
npm install nipplejs --save
Demo
Check out the demo here.
Usage
Import it the way you want into your project :
// CommonJS var manager = require('nipplejs').create(options);
// AMD define(['nipplejs'], function (nipplejs) { var manager = nipplejs.create(options); });
// Module import nipplejs from 'nipplejs';
<!-- Global --> <script src="./nipplejs.js"></script> <script> var manager = nipplejs.create(options); </script>
position
property set, either absolute
, relative
, static
, ....
Options
You can configure your joystick in different ways :
var options = { zone: Element, // active zone color: String, size: Integer, threshold: Float, // before triggering a directional event fadeTime: Integer, // transition time multitouch: Boolean, maxNumberOfNipples: Number, // when multitouch, what is too many? dataOnly: Boolean, // no dom element whatsoever position: Object, // preset position for 'static' mode mode: String, // 'dynamic', 'static' or 'semi' restJoystick: Boolean, restOpacity: Number, // opacity when not 'dynamic' and rested lockX: Boolean, // only move on the X axis lockY: Boolean, // only move on the Y axis catchDistance: Number // distance to recycle previous joystick in // 'semi' mode };
All options are optional
options.zone
defaults to 'body'
The dom element in which all your joysticks will be injected.
<div id="zone_joystick"></div> <script type="text/javascript" src="./nipplejs.js"></script> <script type="text/javascript"> var options = { zone: document.getElementById('zone_joystick'); }; var manager = nipplejs.create(options); </script>
This zone also serve as the mouse/touch events handler.
It represents the zone where all your joysticks will be active.
options.color
defaults to 'white'
The background color of your joystick's elements.
Can be any valid CSS color.
options.size
defaults to 100
The size in pixel of the outer circle.
The inner circle is 50% of this size.
options.threshold
defaults to 0.1
This is the strength needed to trigger a directional event.
Basically, the center is 0 and the outer is 1.
You need to at least go to 0.1 to trigger a directional event.
options.fadeTime
defaults to 250
The time it takes for joystick to fade-out and fade-in when activated or de-activated.
options.multitouch
defaults to false
Enable the multitouch capabilities.
If, for reasons, you need to have multiple nipples in the same zone.
Otherwise, it will only get one, and all new touches won't do a thing.
Please note that multitouch is off when in static
or semi
modes.
options.maxNumberOfNipples
defaults to 1
If you need to, you can also control the maximum number of instances that could be created.
Obviously in a multitouch configuration.
options.dataOnly
defaults to false
The library won't draw anything in the DOM and will only trigger events with data.
options.position
defaults to {top: 0, left: 0}
An object that will determine the position of a static
mode.
You can pass any of the four top
, right
, bottom
and left
.
They will be applied as any css property.
Ex :
{top: '50px', left: '50px'}
{left: '10%', bottom: '10%'}
options.mode
defaults to 'dynamic'.
Three modes are possible :
'dynamic'
- a new joystick is created at each new touch.
- the joystick gets destroyed when released.
- can be multitouch.
'semi'
- new joystick is created at each new touch farther than
options.catchDistance
of any previously created joystick. - the joystick is faded-out when released but not destroyed.
- when touch is made inside the
options.catchDistance
a new direction is triggered immediately. - when touch is made outside the
options.catchDistance
the previous joystick is destroyed and a new one is created. - cannot be multitouch.
'static'
- a joystick is positioned immediately at
options.position
. - one joystick per zone.
- each new touch triggers a new direction.
- cannot be multitouch.
options.restJoystick
defaults to true
Reset the joystick's position when it enters the rest state.
options.restOpacity
defaults to 0.5
The opacity to apply when the joystick is in a rest position.
options.catchDistance
defaults to 200
This is only useful in the semi
mode, and determine at which distance we recycle the previous joystick.
At 200 (px), if you press the zone into a rayon of 200px around the previously displayed joystick, it will act as a static
one.
options.lockX
defaults to false
Locks joystick's movement to the x (horizontal) axis
options.lockY
defaults to false
Locks joystick's movement to the y (vertical) axis
API
NippleJS instance (manager)
Your manager has the following signature :
{ on: Function, // handle internal event off: Function, // un-handle internal event get: Function, // get a specific joystick destroy: Function, // destroy everything ids: Array // array of assigned ids id: Number // id of the manager options: { zone: Element, // reactive zone multitouch: Boolean, maxNumberOfNipples: Number, mode: String, position: Object, catchDistance: Number, size: Number, threshold: Number, color: String, fadeTime: Number, dataOnly: Boolean, restJoystick: Boolean, restOpacity: Number } }
manager.on(type, handler)
If you wish to listen to internal events like :
manager.on('event#1 event#2', function (evt, data) { // Do something. });
Note that you can listen to multiple events at once by separating them either with a space or a comma (or both, I don't care).
manager.off([type, handler])
To remove an event handler :
manager.off('event', handler);
If you call off without arguments, all handlers will be removed.
If you don't specify the handler but just a type, all handlers for that type will be removed.
manager.get(identifier)
A helper to get an instance via its identifier.
// Will return the nipple instantiated by the touch identified by 0 manager.get(0);
manager.destroy()
Gently remove all nipples from the DOM and unbind all events.
manager.destroy();
manager.ids
The array of nipples' ids under this manager.
manager.id
The incremented id of this manager.
nipple instance (joystick)
Each joystick has the following signature :
{ on: Function, off: Function, el: Element, show: Function, // fade-in hide: Function, // fade-out add: Function, // inject into dom remove: Function, // remove from dom destroy: Function, identifier: Number, trigger: Function, position: { // position of the center x: Number, y: Number }, frontPosition: { // position of the front part x: Number, y: Number }, ui: { el: Element, front: Element, back: Element }, options: { color: String, size: Number, threshold: Number, fadeTime: Number } }
joystick.on
, joystick.off
The same as the manager.
joystick.el
Dom element in which the joystick gets created.
<div class="nipple"> <div class="front"></div> <div class="back"></div> </div>
joystick.show([cb])
Will show the joystick at the last known place.
You can pass a callback that will be executed at the end of the fade-in animation.
joystick.hide([cb])
Will fade-out the joystick.
You can pass a callback that will be executed at the end of the fade-out animation.
joystick.add()
Add the joystick's element to the dom.
joystick.remove()
Remove the joystick's element from the dom.
joystick.destroy()
Gently remove this nipple from the DOM and unbind all related events.
joystick.identifier
Returns the unique identifier of the joystick.
Tied to its touch's identifier.
joystick.trigger(type [, data])
Trigger an internal event from the joystick.
The same as on
you can trigger multiple events at the same time.
joystick.position
The absolute position of the center of the joystick.
joystick.frontPosition
The absolute position of the back part of the joystick's ui.
joystick.ui
The object that store its ui elements
{ el: <div class="nipple"></div> back: <div class="back"></div> front: <div class="front"></div> }
Events
You can listen events both on the manager and all the joysticks.
But some of them are specific to its instance.
If you need to listen to each joystick, for example, you can :
manager.on('added', function (evt, nipple) { nipple.on('start move end dir plain', function (evt) { // DO EVERYTHING }); }).on('removed', function (evt, nipple) { nipple.off('start move end dir plain'); });
manager only
added
A joystick just got added.
Will pass the instance alongside the event.
removed
A joystick just got removed.
Fired at the end of the fade-out animation.
Will pass the instance alongside the event.
Won't be trigger in a dataOnly
configuration.
manager and joysticks
Other events are available on both the manager and joysticks.
When listening on the manager, you can also target a joystick in particular by prefixing the event with its identifier, 0:start
for example.
Else you'll get all events from all the joysticks.
start
A joystick is activated. (the user pressed on the active zone)
Will pass the instance alongside the event.
end
A joystick is de-activated. (the user released the active zone)
Will pass the instance alongside the event.
move
A joystick is moved.
Comes with data :
{ identifier: 0, // the identifier of the touch/mouse that triggered it position: { // absolute position of the center in pixels x: 125, y: 95 }, force: 0.2, // strength in % distance: 25.4, // distance from center in pixels pressure: 0.1, // the pressure applied by the touch angle: { radian: 1.5707963268, // angle in radian degree: 90 }, raw: { // note: angle is the same, beyond the 50 pixel limit distance: 25.4, // distance which continues beyond the 50 pixel limit position: { // position of the finger/mouse in pixels, beyond joystick limits x: 125, y: 95 } }, instance: Nipple // the nipple instance that triggered the event }
dir
When a direction is reached after the threshold.
Direction are split with a 45° angle.
// \ UP / // \ / // LEFT RIGHT // / \ // /DOWN \
You can also listen to specific direction like :
dir:up
dir:down
dir:right
dir:left
In this configuration only one direction is triggered at a time.
plain
When a plain direction is reached after the threshold.
Plain directions are split with a 90° angle.
// UP | // ------ LEFT | RIGHT // DOWN |
You can also listen to specific plain direction like :
plain:up
plain:down
plain:right
plain:left
In this configuration two directions can be triggered at a time, because the user could be both up
and left
for example.
shown
Is triggered at the end of the fade-in animation.
Will pass the instance alongside the event.
Won't be trigger in a dataOnly
configuration.
hidden
Is triggered at the end of the fade-out animation.
Will pass the instance alongside the event.
Won't be trigger in a dataOnly
configuration.
destroyed
Is triggered at the end of destroy.
Will pass the instance alongside the event.
pressure
MBP's Force Touch, iOS's 3D Touch, Microsoft's pressure or MDN's force
Is triggered when the pressure on the joystick is changed.
The value, between 0 and 1, is sent back alongside the event.
Contributing
You can follow this document to help you get started.