Created
March 13, 2014 03:27
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鼠标移动方向
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$(".overlayLink").bind("mouseenter mouseleave",function(e){ | |
/** the width and height of the current div **/ | |
var w = $(this).width(); | |
var h = $(this).height(); | |
/** calculate the x and y to get an angle to the center of the div from that x and y. **/ | |
/** gets the x value relative to the center of the DIV and "normalize" it **/ | |
var x = (e.pageX - this.offsetLeft - (w/2)) * ( w > h ? (h/w) : 1 ); | |
var y = (e.pageY - this.offsetTop - (h/2)) * ( h > w ? (w/h) : 1 ); | |
/** the angle and the direction from where the mouse came in/went out clockwise (TRBL=0123);**/ | |
/** first calculate the angle of the point, | |
add 180 deg to get rid of the negative values | |
divide by 90 to get the quadrant | |
add 3 and do a modulo by 4 to shift the quadrants to a proper clockwise TRBL (top/right/bottom/left) **/ | |
var direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180 ) / 90 ) + 3 ) % 4; | |
/** do your animations here **/ | |
switch(direction) { | |
case 0: | |
/** animations from the TOP **/ | |
break; | |
case 1: | |
/** animations from the RIGHT **/ | |
break; | |
case 2: | |
/** animations from the BOTTOM **/ | |
break; | |
case 3: | |
/** animations from the LEFT **/ | |
break; | |
}}); |
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