Adding touch gestures and mouse controls to a 3D CSS cube

An update to the original 3D cube (from July 2009 no less), I’ve added touch gesture support (iOS) and click-and-drag behaviour. Animation is incredibly smooth on the iPhone, even the 3G model. Arrow key presses will still rotate the cube, and ESC will reset it.

Experiment: 3D cube with touch gestures and click and drag
One year on and the cube still only works in Safari. Chrome, which says it supports webkit-perspective and webkit-transform, still renders differently. Firefox doesn’t support 3D transforms yet.

: Experiment updated for Firefox 10 which supports 3D transforms. Although the perspective appears off, probably due to a perspective-origin bug.

It works relatively simply: on click the start co-ordinates are saved and on drag the difference between current drag position and starting co-ordinates are applied to the cube as a transform, which is completed after the specified transition duration. Many thanks to Remy Sharp and his rubik’s experiment, which got me started with a lot of the basics.

Touch tweaks

Pixel values for touch positions are found in event.originalEvent.touches[0].pageX, instead of event.pageX. Using ‘start minus current’ pixel values led the cube to rotate more than intended on the iPhone. To correct, and for intuitive behaviour, the difference is reduced by a factor of four.

JavaScript prevents single touch default events — eg scrolling and text selection, but if it detects more than one touch (event.originalEvent.touches.length) the cube won’t rotate, so pinch and zoom will still work. This is a compromise.

A 200ms transition duration suits the browser, but on touch devices it felt sluggish, so I’ve upped it to 50ms so the cube is always at your finger-tips.

Better CSS

The cube is created exactly as before, but I’ve simplified the markup a little — dropping the face and number class names in favour of CSS3 selectors:

#cube > div:first-child  {
-webkit-transform: rotateX(90deg) translateZ(200px);
-moz-transform: rotateX(90deg) translateZ(200px);

#cube > div:nth-child(2) {
-webkit-transform: translateZ(200px);
-moz-transform: translateZ(200px);

#cube > div:nth-child(3) {
-webkit-transform: rotateY(90deg) translateZ(200px);
-moz-transform: rotateY(90deg) translateZ(200px);
text-align: center;

#cube > div:nth-child(4) {
-webkit-transform: rotateY(180deg) translateZ(200px);
-moz-transform: rotateY(180deg) translateZ(200px);

#cube > div:nth-child(5) {
-webkit-transform: rotateY(-90deg) translateZ(200px);
-moz-transform: rotateY(-90deg) translateZ(200px);

#cube > div:nth-child(6) {
-webkit-transform: rotateX(-90deg) rotate(180deg) translateZ(200px);
-moz-transform: rotateX(-90deg) rotate(180deg) translateZ(200px);

Any questions?

This is quite a speedy write-up, if anything needs explaining I’m happy to go into a bit more detail.