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easing_equations.as
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/*
Easing Equations v1.5
May 1, 2003
(c) 2003 Robert Penner, all rights reserved.
This work is subject to the terms in http://www.robertpenner.com/easing_terms_of_use.html.
These tweening functions provide different flavors of
math-based motion under a consistent API.
Types of easing:
Linear
Quadratic
Cubic
Quartic
Quintic
Sinusoidal
Exponential
Circular
Elastic
Back
Bounce
Changes:
1.5 - added bounce easing
1.4 - added elastic and back easing
1.3 - tweaked the exponential easing functions to make endpoints exact
1.2 - inline optimizations (changing t and multiplying in one step)--thanks to Tatsuo Kato for the idea
Discussed in Chapter 7 of
Robert Penner's Programming Macromedia Flash MX
(including graphs of the easing equations)
http://www.robertpenner.com/profmx
http://www.amazon.com/exec/obidos/ASIN/0072223561/robertpennerc-20
*/
// simple linear tweening - no easing
// t: current time, b: beginning value, c: change in value, d: duration
Math.linearTween = function (t, b, c, d) {
return c*t/d + b;
};
///////////// QUADRATIC EASING: t^2 ///////////////////
// quadratic easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in value, d: duration
// t and d can be in frames or seconds/milliseconds
Math.easeInQuad = function (t, b, c, d) {
return c*(t/=d)*t + b;
};
// quadratic easing out - decelerating to zero velocity
Math.easeOutQuad = function (t, b, c, d) {
return -c *(t/=d)*(t-2) + b;
};
// quadratic easing in/out - acceleration until halfway, then deceleration
Math.easeInOutQuad = function (t, b, c, d) {
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
};
Math.easeOutInQuad = function(t, b, c, d) {
if ((t/=d/2) < 1) return -c/2 * (--t*t - 1) + b;
return c/2*(--t*t + 1) + b;
}
///////////// CUBIC EASING: t^3 ///////////////////////
// cubic easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in value, d: duration
// t and d can be frames or seconds/milliseconds
Math.easeInCubic = function (t, b, c, d) {
return c*(t/=d)*t*t + b;
};
// cubic easing out - decelerating to zero velocity
Math.easeOutCubic = function (t, b, c, d) {
return c*((t=t/d-1)*t*t + 1) + b;
};
// cubic easing in/out - acceleration until halfway, then deceleration
Math.easeInOutCubic = function (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;
};
Math.easeOutInCubic = function (t, b, c, d) {
t/=d/2;
return c/2*(--t*t*t+1) + b;
};
///////////// QUARTIC EASING: t^4 /////////////////////
// quartic easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in value, d: duration
// t and d can be frames or seconds/milliseconds
Math.easeInQuart = function (t, b, c, d) {
return c*(t/=d)*t*t*t + b;
};
// quartic easing out - decelerating to zero velocity
Math.easeOutQuart = function (t, b, c, d) {
return -c * ((t=t/d-1)*t*t*t - 1) + b;
};
// quartic easing in/out - acceleration until halfway, then deceleration
Math.easeInOutQuart = function (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;
};
Math.easeOutInQuart = function(t, b, c, d) {
if ((t /= d/2)<1) return -c/2*(--t*t*t*t-1)+b;
return c/2*(--t*t*t*t+1)+b;
};
///////////// QUINTIC EASING: t^5 ////////////////////
// quintic easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in value, d: duration
// t and d can be frames or seconds/milliseconds
Math.easeInQuint = function (t, b, c, d) {
return c*(t/=d)*t*t*t*t + b;
};
// quintic easing out - decelerating to zero velocity
Math.easeOutQuint = function (t, b, c, d) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
};
// quintic easing in/out - acceleration until halfway, then deceleration
Math.easeInOutQuint = function (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;
};
// quintic easing out/in - deceleration until halfway, then acceleration
Math.easeOutInQuint = function (t, b, c, d) {
t/=d/2;
return c/2*(--t*t*t*t*t+1) + b;
};
///////////// SINUSOIDAL EASING: sin(t) ///////////////
// sinusoidal easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in position, d: duration
Math.easeInSine = function (t, b, c, d) {
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
};
// sinusoidal easing out - decelerating to zero velocity
Math.easeOutSine = function (t, b, c, d) {
return c * Math.sin(t/d * (Math.PI/2)) + b;
};
// sinusoidal easing in/out - accelerating until halfway, then decelerating
Math.easeInOutSine = function (t, b, c, d) {
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
};
Math.easeOutInSine = function (t, b, c, d) {
if ((t /= d/2)<1) return c/2 * (Math.sin(Math.PI*t/2) ) + b;
return -c/2 * (Math.cos(Math.PI*--t/2)-2) + b;
};
///////////// EXPONENTIAL EASING: 2^t /////////////////
// exponential easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in position, d: duration
Math.easeInExpo = function (t, b, c, d) {
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
};
// exponential easing out - decelerating to zero velocity
Math.easeOutExpo = function (t, b, c, d) {
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
};
// exponential easing in/out - accelerating until halfway, then decelerating
Math.easeInOutExpo = function (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;
};
Math.easeOutInExpo = function (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))+1) + b;
};
/////////// CIRCULAR EASING: sqrt(1-t^2) //////////////
// circular easing in - accelerating from zero velocity
// t: current time, b: beginning value, c: change in position, d: duration
Math.easeInCirc = function (t, b, c, d) {
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
};
// circular easing out - decelerating to zero velocity
Math.easeOutCirc = function (t, b, c, d) {
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
};
// circular easing in/out - acceleration until halfway, then deceleration
Math.easeInOutCirc = function (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;
};
Math.easeOutInCirc = function (t, b, c, d) {
if ((t/=d/2) < 1) return c/2 * Math.sqrt(1 - --t*t) + b;
return c/2 * (2-Math.sqrt(1 - --t*t) ) + b;
};
//
/////////// ELASTIC EASING: exponentially decaying sine wave //////////////
// t: current time, b: beginning value, c: change in value, d: duration, a: amplitude (optional), p: period (optional)
// t and d can be in frames or seconds/milliseconds
Math.easeInElastic = function (t, b, c, d, a, p) {
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;
};
Math.easeOutElastic = function (t, b, c, d, a, p) {
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;
};
//
Math.easeInOutElastic = function (t, b, c, d, a, p) {
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) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
return a*Math.pow(2,-10*--t) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
};
//