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ease-functions.tis
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namespace Ease // collection of easing functions of Robert Penner
{
// See: http://www.robertpenner.com/easing/
// signature of methods: (current_time, start_value, end_value-start_value, total_time)
function Linear( t, b = 0.0, c = 1.0, d = 1.0)
{
return (t/d)*c + b;
}
function InQuad( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*(t/=d)*t + b;
}
function OutQuad( t, b = 0.0, c = 1.0, d = 1.0)
{
return -c *(t/=d)*(t-2) + b;
}
function InOutQuad( t, b = 0.0, c = 1.0, d = 1.0)
{
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
}
function InCubic( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*(t/=d)*t*t + b;
}
function OutCubic( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*((t=t/d-1)*t*t + 1) + b;
}
function InOutCubic( t, b = 0.0, c = 1.0, d = 1.0)
{
if ((t/=d/2) < 1) return c/2*t*t*t + b;
return c/2*((t-=2)*t*t + 2) + b;
}
function InQuart( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*(t/=d)*t*t*t + b;
}
function OutQuart ( t, b = 0.0, c = 1.0, d = 1.0)
{
return -c * ((t=t/d-1)*t*t*t - 1) + b;
}
function InOutQuart ( t, b = 0.0, c = 1.0, d = 1.0)
{
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
return -c/2 * ((t-=2)*t*t*t - 2) + b;
}
function InQuint ( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*(t/=d)*t*t*t*t + b;
}
function OutQuint ( t, b = 0.0, c = 1.0, d = 1.0)
{
return c*((t=t/d-1)*t*t*t*t + 1) + b;
}
function InOutQuint( t, b = 0.0, c = 1.0, d = 1.0)
{
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;
}
function InSine( t, b = 0.0, c = 1.0, d = 1.0)
{
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
}
function OutSine( t, b = 0.0, c = 1.0, d = 1.0)
{
return c * Math.sin(t/d * (Math.PI/2)) + b;
}
function InOutSine( t, b = 0.0, c = 1.0, d = 1.0)
{
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
}
function InExpo( t, b = 0.0, c = 1.0, d = 1.0)
{
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
}
function OutExpo( t, b = 0.0, c = 1.0, d = 1.0)
{
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
}
function InOutExpo( t, b = 0.0, c = 1.0, d = 1.0)
{
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;
}
function InCirc( t, b = 0.0, c = 1.0, d = 1.0)
{
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
}
function OutCirc( t, b = 0.0, c = 1.0, d = 1.0)
{
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
}
function InOutCirc( t, b = 0.0, c = 1.0, d = 1.0)
{
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;
}
function InElastic( t, b = 0.0, c = 1.0, d = 1.0)
{
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; s=p/4; }
else 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;
}
function OutElastic( t, b = 0.0, c = 1.0, d = 1.0)
{
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; s=p/4; }
else 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;
}
function InOutElastic( t, b = 0.0, c = 1.0, d = 1.0)
{
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; s=p/4; }
else 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;
}
function InBack( t, b = 0.0, c = 1.0, d = 1.0, s = 1.70158)
{
return c*(t/=d)*t*((s+1)*t - s) + b;
}
function OutBack( t, b = 0.0, c = 1.0, d = 1.0, s = 1.70158)
{
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
}
function InOutBack( t, b = 0.0, c = 1.0, d = 1.0, 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;
}
function OutBounce( t, b = 0.0, c = 1.0, d = 1.0)
{
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;
}
function InBounce( t, b = 0.0, c = 1.0, d = 1.0)
{
return c - OutBounce ( d-t, 0, c, d) + b;
}
function InOutBounce( t, b = 0.0, c = 1.0, d = 1.0)
{
if (t < d/2) return InBounce ( t*2, 0, c, d ) * .5 + b;
return OutBounce ( t*2-d, 0, c, d ) * .5 + c*.5 + b;
}
} //namespace Ease