[Let] RunAway

nori_17 — 2010-07-01T07:06:21Z
/*
 * @title RunAway
 * @description リンクが逃げる逃げる
 * @author nori (http://twitter.com/5509)
 * @base script hisasann (http://twitter.com/hisasann)
 * @include http://*
 * @license MIT License
 */

(function() {
 
 	var mouseX, mouseY, d = document, dE = d.documentElement,
 		rate = 60,
 		instance = 3000,
 		anchors = d.getElementsByTagName('a');
 		
 	addEvent(d, 'mousemove', function(e) {
 		mouseY = e.pageY ? e.pageY : e.clientY + dE.scrollTop;
 		mouseX = e.pageX ? e.pageX : e.clientX + dE.scrollLeft;
 	});
 	
 	mover(anchors, instance, rate);
 	
	function mover(selector, instance, rate) {
		var firstPointX = [],
			firstPointY = [];
			
	 	for ( var i=0; i<anchors.length; i++ ) {
			firstPointX[i] = anchors[i].offsetLeft;
			firstPointY[i] = anchors[i].offsetTop;
			
			var span = d.createElement('span');
			setStyles(span, {
				display: 'inline-block',
				width: anchors[i].offsetWidth+'px'
			});
			insertAfter(anchors[i].parentNode, span, anchors[i]);
		}					

		(function(){
			for ( var i=0; i<anchors.length; i++ ) {
				var elem = anchors[i],
					offsetY = elem.offsetTop,
					offsetX = elem.offsetLeft,
					theta = Math.atan2(offsetY - mouseY, offsetX - mouseX),
					d = instance / Math.sqrt(Math.pow(mouseX - offsetX, 2) + Math.pow(mouseY - offsetY, 2)),
					left = parseInt(offsetX) + d * Math.cos(theta) + (firstPointX[i] - offsetX) * 0.1,
					top = parseInt(offsetY) + d * Math.sin(theta) + (firstPointY[i] - offsetY) * 0.1;
					
				if ( !isNaN(top) && !isNaN(left) ) {
					setStyles(elem, {
						left: left+'px',
						top: top+'px'
					});
				} else {
					setStyles(elem, {
						position: 'absolute'
					});
				}
			}
			
			setTimeout(arguments.callee, rate);
		})();
	}
 		
 	function addEvent(elm, listener, fn) {
		try {
			elm.addEventListener(listener, fn, false);
		} catch (e) {
			elm.attachEvent('on' + listener, fn);
		}
	}
	
	function setStyles(elm, hash) {
		for ( var c in hash ) {
			elm.style[c] = hash[c];
		}
	}

	function insertAfter(parent, node, referenceNode) {
		parent.insertBefore(node, referenceNode.nextSibling);
	}
 
 })();
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[Let] RunAway
