Getting Web Multi-Touch Working

Getting Web Multi-Touch Working for a Fast-Paced Game

Aidan WuMay 19, 2012

13:40 - 14:10

Screen Interactions

On the desktop weworry about ‘browsers’box-shadow:10px 10px 5px #000;-moz-box-shadow:10px 10px 5px #000;-webkit-box-shadow:10px 10px 5px #000;

On mobile we worry about ‘users’

Fast, Faster, Fastest

回不去了…Touch Interfaces Everywhere

Mobile + Touch Device + Web

MVC

Design pattern from design view

How to make a continuous \ interface

M

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Limited Navigation Space

Manipulating UI Elements

How to make an interface looks touchable

V

How to make an interface touchable

Source: www.lukew.com

C

MVC

• M - Moving toward (continuous)

• V - Looking touchable

• C – Touch(Gesture)-aware

Handling Multi-Touch Events

<divontouchstart = "touchStart(e);”

ontouchmove = "touchMove(e);”

ontouchend = "touchEnd(e);”

</div>

Touches Arrays

• e.touches – a list of all fingers currently on the screen.

• e.targetTouches – a list of fingers on the current DOM element.

• e.changedTouches – changed touches for this event

addEventListener('touchmove', function(e) {

TouchEvent Object

var touch = e.changedTouches[0];

• dentifier

• touch.pageY

• touch.screenX

• touch.clientX

Javascript Gesture Library

jGestures

Hammer.js

More in http://goo.gl/h5M7B

jGestures

• jQuery(’#el').bind('swipeup', log);

• jQuery(’#el').bind('swiperightup',log);

• jQuery('#el').bind('taptwo',log);

• jQuery('#el').bind('rotate',log);

Tips

• <meta name="viewport" content="width=device-width; initial-scale=1.0;maximum-scale=1.0; user-scalable=0;">

• preventDefault();

Finger Interactions for Games

Source: Vans Finger Fracture

issues1. Resizing and scaling2. Pre-loading3. Touch and mouse-aware4. Sprites / animations / Transitions5. GUI / Z-index