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Easing added to animate method
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@jonahgoldsaito
jonahgoldsaito committed Feb 21, 2012
1 parent d96f0f4 commit 6f5e2bc
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31 changes: 31 additions & 0 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,10 @@ <h3 id="parallax2">Parallax</h3>
<h3 id="parallax3">Parallax</h3>
</div>

<div class="scrollblock" id="examples-easing">
<h2 id="easing">Easing</h2>
</div>

<div class="scrollblock" id="howtouse">
<h1>How To Use</h1>
<p id="disclaimer">Disclaimer: This is an experimental, just-for-fun sort of project and hasn&rsquo;t been thoroughly tested.</p>
Expand Down Expand Up @@ -100,6 +104,11 @@ <h1>How To Use</h1>
<span class="param">pin</span>
<span class="param-def">set to true if you want the scroll block to be pinned during its animations <small>(note: block will be pinned for all its element&rsquo;s animations)</small></span>
</li>
<li>
<span class="param">easing</span>
<span class="param-def">'bounce baby, bounce.' use the same easing equations you're used to.
<small>(if unassigned, will be linear)</span>
</li>

</ul>
<p class="divider">&#9733; &#9733; &#9733;</p>
Expand Down Expand Up @@ -161,6 +170,28 @@ <h1>Credits</h1>
// animate the parallaxing
scrollorama.animate('#parallax2',{ delay: 400, duration: 600, property:'top', start:800, end:-800 });
scrollorama.animate('#parallax3',{ delay: 200, duration: 1200, property:'top', start:500, end:-500 });

// animate some easing examples
var $easing = $('#easing'),
$clone = $easing.clone().appendTo('#examples-easing')
.css({position:'relative',top:'-2.78em'});
$easing.css({ color: '#131420', textShadow: '0 1px 0 #363959' });
$clone.lettering();
easing_array = [ 'easeOutBounce',
'easeOutQuad',
'easeOutCubic',
'easeOutQuart',
'easeOutQuint',
'easeOutExpo',
];
$clone.find('span')
.css({ position: 'relative', top: 0, left: 0, color:'#' })
.each( function( idx, el ){
scrollorama.animate( $(this), { delay:400, duration: 500,
property:'top', end: 300,
easing: easing_array[idx] });
})

});
</script>

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155 changes: 154 additions & 1 deletion js/jquery.scrollorama.js
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Expand Up @@ -133,6 +133,15 @@
else {
// calculate percent to animate
var animPercent = (scrollTop - startAnimPos) / anim.duration;
// account for easing if there is any
/*console.log(
anim.easing,
$.easing[anim.easing],
jQuery.isFunction( $.easing[anim.easing] )
);*/
if ( anim.easing && $.isFunction( $.easing[anim.easing] ) ){
animPercent = $.easing[anim.easing]( animPercent, animPercent*1000, 0, 1, 1000 );
}
// then multiply the percent by the value range and calculate the new value
var animVal = anim.startVal + (animPercent * (anim.endVal - anim.startVal));
setProperty(anim.element, anim.property, animVal);
Expand Down Expand Up @@ -189,6 +198,7 @@
end = end value of the property
pin = pin block during animation duration (applies to all animations within block)
baseline = top (default, when block reaches top of viewport) or bottom (when block first comies into view)
easing = just like jquery's easing functions
*/

// if string, convert to DOM object
Expand Down Expand Up @@ -245,7 +255,8 @@
property: anim.property,
startVal: anim.start !== undefined ? anim.start : parseInt(target.css(anim.property),10), // if undefined, use current css value
endVal: anim.end !== undefined ? anim.end : parseInt(target.css(anim.property),10), // if undefined, use current css value
baseline: anim.baseline !== undefined ? anim.baseline : 'bottom'
baseline: anim.baseline !== undefined ? anim.baseline : 'bottom',
easing: anim.easing
});

if (anim.pin) {
Expand Down Expand Up @@ -295,5 +306,147 @@

return scrollorama;
};



//
// Easing functions COPIED DIRECTLY from jQuery UI
//
$.extend($.easing,
{
def: 'easeOutQuad',
swing: function (x, t, b, c, d) {
//alert($.easing.default);
return $.easing[$.easing.def](x, t, b, c, d);
},
easeInQuad: function (x, t, b, c, d) {
return c*(t/=d)*t + b;
},
easeOutQuad: function (x, t, b, c, d) {
return -c *(t/=d)*(t-2) + b;
},
easeInOutQuad: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
},
easeInCubic: function (x, t, b, c, d) {
return c*(t/=d)*t*t + b;
},
easeOutCubic: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t + 1) + b;
},
easeInOutCubic: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t + b;
return c/2*((t-=2)*t*t + 2) + b;
},
easeInQuart: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t + b;
},
easeOutQuart: function (x, t, b, c, d) {
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeInOutQuart: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
return -c/2 * ((t-=2)*t*t*t - 2) + b;
},
easeInQuint: function (x, t, b, c, d) {
return c*(t/=d)*t*t*t*t + b;
},
easeOutQuint: function (x, t, b, c, d) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
},
easeInOutQuint: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
return c/2*((t-=2)*t*t*t*t + 2) + b;
},
easeInSine: function (x, t, b, c, d) {
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
},
easeOutSine: function (x, t, b, c, d) {
return c * Math.sin(t/d * (Math.PI/2)) + b;
},
easeInOutSine: function (x, t, b, c, d) {
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
},
easeInExpo: function (x, t, b, c, d) {
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
},
easeOutExpo: function (x, t, b, c, d) {
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
},
easeInOutExpo: function (x, t, b, c, d) {
if (t==0) return b;
if (t==d) return b+c;
if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
},
easeInCirc: function (x, t, b, c, d) {
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
},
easeOutCirc: function (x, t, b, c, d) {
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
},
easeInOutCirc: function (x, t, b, c, d) {
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
},
easeInElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
easeOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
},
easeInOutElastic: function (x, t, b, c, d) {
var s=1.70158;var p=0;var a=c;
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
if (a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
},
easeInBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*(t/=d)*t*((s+1)*t - s) + b;
},
easeOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
easeInOutBack: function (x, t, b, c, d, s) {
if (s == undefined) s = 1.70158;
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
},
easeInBounce: function (x, t, b, c, d) {
return c - $.easing.easeOutBounce (x, d-t, 0, c, d) + b;
},
easeOutBounce: function (x, t, b, c, d) {
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
},
easeInOutBounce: function (x, t, b, c, d) {
if (t < d/2) return $.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
return $.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
}
});





})(jQuery);

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