Awesome

jquery.transform2d.js adds 2d transform capabilities to jQuery css() and animate() functions.

Usage:

Set transform with a string

$(elem).css('transform', 'translate(50px, 30px) rotate(25deg) scale(2,.5) skew(-35deg)');
$(elem).animate({transform: 'translateY(-100px) rotate(1rad) scaleX(2) skewY(42deg)'});

You can use the following list of transform components:

translateX(<number>px)
translateY(<number>px)
combined: translate(<number>px, <number>px) the second number is optional and defaults to 0
scaleX(<number>)
scaleY(<number>)
combined: scale(<number>, <number>) the second number is optional and defaults to the value of the first one
rotate(<angle>) units for angles are rad (default), deg or grad.
skew(<angle>)
skew(<angle>)
combined: skew(<angle>, <angle>) the second angle is optional and defaults to 0
matrix(<number>, <number>, <number>, <number>, <number>, <number>)*

*matrix gives you more control about the resulting transformation, using a matrix construction set.
When using it in animations however, it makes it impossible to predict how the current and target transformations are going to be interpolated; there is no way to tell whether elements are going to rotate clockwise or anti-clockwise for instance.

Get transform

returns a computed transform matrix.

$(elem).css('transform') == 'matrix(0,1,-1,0,100,50)';

Set transform-origin with a string

$(elem).css('transform-origin', 'top left');
$(elem).animate({transformOrigin: 'top left'});

Get transform-origin

$(elem).css('transform-origin')

Usually the returned units are in pixels however Firefox and IE-less-than-9 may return percentages.

Relative animations

Relative animations are possible by prepending "+=" at the end of the transform string.

$(elem).css('transform', 'rotate(45deg)');
// using the following syntax, elem will always rotate 90deg anticlockwise
$(elem).animate({transform: '+=rotate(-90deg)'});

Limitations:

requires jQuery 1.4.3+,
units must be px or deg (TODO)

Potential Translation Issues in IE 8 and Below

Since translate and transform-origin is unavailable in IE 8 and below, we have to emulate it using top and left properties of the element style. This library tries to emulate translate and transform-origin using position relative to reposition the element. While this closely emulates the expected behavior, if the element is already positioned, the existing position is respected as much as possible.

absolute positioned elements are repositioned using marginTop and marginLeft to avoid conclicts
inline styles for top and left (or marginTop and marginLeft) will be overwritten
changes in the height or width of the element will not be dynamically reflected
IE 7 and below incorrectly alter the offset height and width of the element to match the transformed offset height and width

License

Dual licensed under GPL and MIT licenses.