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Viewing file:     jquery.transform.js (12.95 KB)      -rw-rw-rw-

/*
 * transform: A jQuery cssHooks adding cross-browser 2d transform capabilities to $.fn.css() and $.fn.animate()
 *
 * limitations:
 * - requires jQuery 1.4.3+
 * - Should you use the *translate* property, then your elements need to be absolutely positionned in a relatively positionned wrapper **or it will fail in IE678**.
 * - transformOrigin is not accessible
 *
 * latest version and complete README available on Github:
 * https://github.com/louisremi/jquery.transform.js
 *
 * Copyright 2011 @louis_remi
 * Licensed under the MIT license.
 *
 * This saved you an hour of work?
 * Send me music http://www.amazon.co.uk/wishlist/HNTU0468LQON
 *
 */
(function( $ ) {

/*
 * Feature tests and global variables
 */
var div = document.createElement('div'),
	divStyle = div.style,
	propertyName = 'transform',
	suffix = 'Transform',
	testProperties = [
		'O' + suffix,
		'ms' + suffix,
		'Webkit' + suffix,
		'Moz' + suffix,
		// prefix-less property
		propertyName
	],
	i = testProperties.length,
	supportProperty,
	supportMatrixFilter,
	propertyHook,
	propertyGet,
	rMatrix = /Matrix([^)]*)/;

// test different vendor prefixes of this property
while ( i-- ) {
	if ( testProperties[i] in divStyle ) {
		$.support[propertyName] = supportProperty = testProperties[i];
		continue;
	}
}
// IE678 alternative
if ( !supportProperty ) {
	$.support.matrixFilter = supportMatrixFilter = divStyle.filter === '';
}
// prevent IE memory leak
div = divStyle = null;

// px isn't the default unit of this property
$.cssNumber[propertyName] = true;

/*
 * fn.css() hooks
 */
if ( supportProperty && supportProperty != propertyName ) {
	// Modern browsers can use jQuery.cssProps as a basic hook
	$.cssProps[propertyName] = supportProperty;
	
	// Firefox needs a complete hook because it stuffs matrix with 'px'
	if ( supportProperty == 'Moz' + suffix ) {
		propertyHook = {
			get: function( elem, computed ) {
				return (computed ?
					// remove 'px' from the computed matrix
					$.css( elem, supportProperty ).split('px').join(''):
					elem.style[supportProperty]
				)
			},
			set: function( elem, value ) {
				// remove 'px' from matrices
				elem.style[supportProperty] = /matrix[^)p]*\)/.test(value) ?
					value.replace(/matrix((?:[^,]*,){4})([^,]*),([^)]*)/, 'matrix$1$2px,$3px'):
					value;
			}
		}
	/* Fix two jQuery bugs still present in 1.5.1
	 * - rupper is incompatible with IE9, see http://jqbug.com/8346
	 * - jQuery.css is not really jQuery.cssProps aware, see http://jqbug.com/8402
	 */
	} else if ( /^1\.[0-5](?:\.|$)/.test($.fn.jquery) ) {
		propertyHook = {
			get: function( elem, computed ) {
				return (computed ?
					$.css( elem, supportProperty.replace(/^ms/, 'Ms') ):
					elem.style[supportProperty]
				)
			}
		}
	}
	/* TODO: leverage hardware acceleration of 3d transform in Webkit only
	else if ( supportProperty == 'Webkit' + suffix && support3dTransform ) {
		propertyHook = {
			set: function( elem, value ) {
				elem.style[supportProperty] = 
					value.replace();
			}
		}
	}*/
	
} else if ( supportMatrixFilter ) {
	propertyHook = {
		get: function( elem, computed ) {
			var elemStyle = ( computed && elem.currentStyle ? elem.currentStyle : elem.style ),
				matrix;

			if ( elemStyle && rMatrix.test( elemStyle.filter ) ) {
				matrix = RegExp.$1.split(',');
				matrix = [
					matrix[0].split('=')[1],
					matrix[2].split('=')[1],
					matrix[1].split('=')[1],
					matrix[3].split('=')[1]
				];
			} else {
				matrix = [1,0,0,1];
			}
			matrix[4] = elemStyle ? elemStyle.left : 0;
			matrix[5] = elemStyle ? elemStyle.top : 0;
			return "matrix(" + matrix + ")";
		},
		set: function( elem, value, animate ) {
			var elemStyle = elem.style,
				currentStyle,
				Matrix,
				filter;

			if ( !animate ) {
				elemStyle.zoom = 1;
			}

			value = matrix(value);

			// rotate, scale and skew
			if ( !animate || animate.M ) {
				Matrix = [
					"Matrix("+
						"M11="+value[0],
						"M12="+value[2],
						"M21="+value[1],
						"M22="+value[3],
						"SizingMethod='auto expand'"
				].join();
				filter = ( currentStyle = elem.currentStyle ) && currentStyle.filter || elemStyle.filter || "";

				elemStyle.filter = rMatrix.test(filter) ?
					filter.replace(rMatrix, Matrix) :
					filter + " progid:DXImageTransform.Microsoft." + Matrix + ")";

				// center the transform origin, from pbakaus's Transformie http://github.com/pbakaus/transformie
				if ( (centerOrigin = $.transform.centerOrigin) ) {
					elemStyle[centerOrigin == 'margin' ? 'marginLeft' : 'left'] = -(elem.offsetWidth/2) + (elem.clientWidth/2) + 'px';
					elemStyle[centerOrigin == 'margin' ? 'marginTop' : 'top'] = -(elem.offsetHeight/2) + (elem.clientHeight/2) + 'px';
				}
			}

			// translate
			if ( !animate || animate.T ) {
				// We assume that the elements are absolute positionned inside a relative positionned wrapper
				elemStyle.left = value[4] + 'px';
				elemStyle.top = value[5] + 'px';
			}
		}
	}
}
// populate jQuery.cssHooks with the appropriate hook if necessary
if ( propertyHook ) {
	$.cssHooks[propertyName] = propertyHook;
}
// we need a unique setter for the animation logic
propertyGet = propertyHook && propertyHook.get || $.css;

/*
 * fn.animate() hooks
 */
$.fx.step.transform = function( fx ) {
	var elem = fx.elem,
		start = fx.start,
		end = fx.end,
		split,
		pos = fx.pos,
		transform,
		translate,
		rotate,
		scale,
		skew,
		T = false,
		M = false,
		prop;
	translate = rotate = scale = skew = '';

	// fx.end and fx.start need to be converted to their translate/rotate/scale/skew components
	// so that we can interpolate them
	if ( !start || typeof start === "string" ) {
		// the following block can be commented out with jQuery 1.5.1+, see #7912
		if (!start) {
			start = propertyGet( elem, supportProperty );
		}

		// force layout only once per animation
		if ( supportMatrixFilter ) {
			elem.style.zoom = 1;
		}

		// if the start computed matrix is in end, we are doing a relative animation
		split = end.split(start);
		if ( split.length == 2 ) {
			// remove the start computed matrix to make animations more accurate
			end = split.join('');
			fx.origin = start;
			start = 'none';
		}

		// start is either 'none' or a matrix(...) that has to be parsed
		fx.start = start = start == 'none'?
			{
				translate: [0,0],
				rotate: 0,
				scale: [1,1],
				skew: [0,0]
			}:
			unmatrix( toArray(start) );

		// fx.end has to be parsed and decomposed
		fx.end = end = ~end.indexOf('matrix')?
			// bullet-proof parser
			unmatrix(matrix(end)):
			// faster and more precise parser
			components(end);

		// get rid of properties that do not change
		for ( prop in start) {
			if ( prop == 'rotate' ?
				start[prop] == end[prop]:
				start[prop][0] == end[prop][0] && start[prop][1] == end[prop][1]
			) {
				delete start[prop];
			}
		}
	}

	/*
	 * We want a fast interpolation algorithm.
	 * This implies avoiding function calls and sacrifying DRY principle:
	 * - avoid $.each(function(){})
	 * - round values using bitewise hacks, see http://jsperf.com/math-round-vs-hack/3
	 */
	if ( start.translate ) {
		// round translate to the closest pixel
		translate = ' translate('+
			((start.translate[0] + (end.translate[0] - start.translate[0]) * pos + .5) | 0) +'px,'+
			((start.translate[1] + (end.translate[1] - start.translate[1]) * pos + .5) | 0) +'px'+
		')';
		T = true;
	}
	if ( start.rotate != undefined ) {
		rotate = ' rotate('+ (start.rotate + (end.rotate - start.rotate) * pos) +'rad)';
		M = true;
	}
	if ( start.scale ) {
		scale = ' scale('+
			(start.scale[0] + (end.scale[0] - start.scale[0]) * pos) +','+
			(start.scale[1] + (end.scale[1] - start.scale[1]) * pos) +
		')';
		M = true;
	}
	if ( start.skew ) {
		skew = ' skew('+
			(start.skew[0] + (end.skew[0] - start.skew[0]) * pos) +'rad,'+
			(start.skew[1] + (end.skew[1] - start.skew[1]) * pos) +'rad'+
		')';
		M = true;
	}

	// In case of relative animation, restore the origin computed matrix here.
	transform = fx.origin ?
		fx.origin + translate + skew + scale + rotate:
		translate + rotate + scale + skew;

	propertyHook && propertyHook.set ?
		propertyHook.set( elem, transform, {M: M, T: T} ):
		elem.style[supportProperty] = transform;
};

/*
 * Utility functions
 */

// turns a transform string into its 'matrix(A,B,C,D,X,Y)' form (as an array, though)
function matrix( transform ) {
	transform = transform.split(')');
	var
			trim = $.trim
		// last element of the array is an empty string, get rid of it
		, i = transform.length -1
		, split, prop, val
		, A = 1
		, B = 0
		, C = 0
		, D = 1
		, A_, B_, C_, D_
		, tmp1, tmp2
		, X = 0
		, Y = 0
		;
	// Loop through the transform properties, parse and multiply them
	while (i--) {
		split = transform[i].split('(');
		prop = trim(split[0]);
		val = split[1];
		A_ = B_ = C_ = D_ = 0;

		switch (prop) {
			case 'translateX':
				X += parseInt(val, 10);
				continue;

			case 'translateY':
				Y += parseInt(val, 10);
				continue;

			case 'translate':
				val = val.split(',');
				X += parseInt(val[0], 10);
				Y += parseInt(val[1] || 0, 10);
				continue;

			case 'rotate':
				val = toRadian(val);
				A_ = Math.cos(val);
				B_ = Math.sin(val);
				C_ = -Math.sin(val);
				D_ = Math.cos(val);
				break;

			case 'scaleX':
				A_ = val;
				D_ = 1;
				break;

			case 'scaleY':
				A_ = 1;
				D_ = val;
				break;

			case 'scale':
				val = val.split(',');
				A_ = val[0];
				D_ = val.length>1 ? val[1] : val[0];
				break;

			case 'skewX':
				A_ = D_ = 1;
				C_ = Math.tan(toRadian(val));
				break;

			case 'skewY':
				A_ = D_ = 1;
				B_ = Math.tan(toRadian(val));
				break;

			case 'skew':
				A_ = D_ = 1;
				val = val.split(',');
				C_ = Math.tan(toRadian(val[0]));
				B_ = Math.tan(toRadian(val[1] || 0));
				break;

			case 'matrix':
				val = val.split(',');
				A_ = +val[0];
				B_ = +val[1];
				C_ = +val[2];
				D_ = +val[3];
				X += parseInt(val[4], 10);
				Y += parseInt(val[5], 10);
		}
		// Matrix product
		tmp1 = A * A_ + B * C_;
		B    = A * B_ + B * D_;
		tmp2 = C * A_ + D * C_;
		D    = C * B_ + D * D_;
		A = tmp1;
		C = tmp2;
	}
	return [A,B,C,D,X,Y];
}

// turns a matrix into its rotate, scale and skew components
// algorithm from http://hg.mozilla.org/mozilla-central/file/7cb3e9795d04/layout/style/nsStyleAnimation.cpp
function unmatrix(matrix) {
	var
			scaleX
		, scaleY
		, skew
		, A = matrix[0]
		, B = matrix[1]
		, C = matrix[2]
		, D = matrix[3]
		;

	// Make sure matrix is not singular
	if ( A * D - B * C ) {
		// step (3)
		scaleX = Math.sqrt( A * A + B * B );
		A /= scaleX;
		B /= scaleX;
		// step (4)
		skew = A * C + B * D;
		C -= A * skew;
		D -= B * skew;
		// step (5)
		scaleY = Math.sqrt( C * C + D * D );
		C /= scaleY;
		D /= scaleY;
		skew /= scaleY;
		// step (6)
		if ( A * D < B * C ) {
			//scaleY = -scaleY;
			//skew = -skew;
			A = -A;
			B = -B;
			skew = -skew;
			scaleX = -scaleX;
		}

	// matrix is singular and cannot be interpolated
	} else {
		rotate = scaleX = scaleY = skew = 0;
	}

	return {
		translate: [+matrix[4], +matrix[5]],
		rotate: Math.atan2(B, A),
		scale: [scaleX, scaleY],
		skew: [skew, 0]
	}
}

// parse tranform components of a transform string not containing 'matrix(...)'
function components( transform ) {
	// split the != transforms
  transform = transform.split(')');

	var translate = [0,0],
    rotate = 0,
    scale = [1,1],
    skew = [0,0],
    i = transform.length -1,
    trim = $.trim,
    split, name, value;

  // add components
  while ( i-- ) {
    split = transform[i].split('(');
    name = trim(split[0]);
    value = split[1];
    
    if (name == 'translateX') {
      translate[0] += parseInt(value, 10);

    } else if (name == 'translateY') {
      translate[1] += parseInt(value, 10);

    } else if (name == 'translate') {
      value = value.split(',');
      translate[0] += parseInt(value[0], 10);
      translate[1] += parseInt(value[1] || 0, 10);

    } else if (name == 'rotate') {
      rotate += toRadian(value);

    } else if (name == 'scaleX') {
      scale[0] *= value;

    } else if (name == 'scaleY') {
      scale[1] *= value;

    } else if (name == 'scale') {
      value = value.split(',');
      scale[0] *= value[0];
      scale[1] *= (value.length>1? value[1] : value[0]);

    } else if (name == 'skewX') {
      skew[0] += toRadian(value);

    } else if (name == 'skewY') {
      skew[1] += toRadian(value);

    } else if (name == 'skew') {
      value = value.split(',');
      skew[0] += toRadian(value[0]);
      skew[1] += toRadian(value[1] || '0');
    }
	}

  return {
    translate: translate,
    rotate: rotate,
    scale: scale,
    skew: skew
  };
}

// converts an angle string in any unit to a radian Float
function toRadian(value) {
	return ~value.indexOf('deg') ?
		parseInt(value,10) * (Math.PI * 2 / 360):
		~value.indexOf('grad') ?
			parseInt(value,10) * (Math.PI/200):
			parseFloat(value);
}

// Converts 'matrix(A,B,C,D,X,Y)' to [A,B,C,D,X,Y]
function toArray(matrix) {
	// Fremove the unit of X and Y for Firefox
	matrix = /\(([^,]*),([^,]*),([^,]*),([^,]*),([^,p]*)(?:px)?,([^)p]*)(?:px)?/.exec(matrix);
	return [matrix[1], matrix[2], matrix[3], matrix[4], matrix[5], matrix[6]];
}

$.transform = {
	centerOrigin: 'margin'
};

})( jQuery );