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动画库tween.js4 ^. X2 {8 H' I* ^. }1 a! y* {
+ G1 z" X& v \% Y0 M4 x
相关资料 http://robertpenner.com/easing/: t% R6 J3 @8 c% ]0 q6 K" V
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7 T3 ?# ~( m, B, \' h; |) u- lLinear:无缓动效果;
9 ^. D4 y2 l% p# @; Y& lQuadratic:二次方的缓动(t^2);* d) `1 ^* a8 S7 Y; B4 O
Cubic:三次方的缓动(t^3);( a7 H* o, G. F2 P: B( W a7 b
Quartic:四次方的缓动(t^4);
, O7 ]. ~( G" l) M [7 UQuintic:五次方的缓动(t^5);
4 E- [" a* y" W6 Y- v! M6 w1 uSinusoidal:正弦曲线的缓动(sin(t));2 C6 Q$ C9 x' ]7 R, B# K) G* j; T3 F; `# o
Exponential:指数曲线的缓动(2^t);
2 T, W& {8 D n/ D7 [/ P/ h6 ECircular:圆形曲线的缓动(sqrt(1-t^2));- K- ^- Q" d6 O, k
Elastic:指数衰减的正弦曲线缓动;
# _" H+ H+ [. A* A# W1 ^Back:超过范围的三次方缓动((s+1)*t^3 - s*t^2);8 H$ _% C& [- d
Bounce:指数衰减的反弹缓动。% W9 ^( |5 N8 o3 ?5 N
ps:以上都是自己的烂翻译,希望各位修正。" t" ` m' D' `# g, U
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每个效果都分三个缓动方式(方法),分别是:% Q0 q, I" f( r7 Y4 r' n
easeIn:从0开始加速的缓动;
+ m" A; v# s& ~: |; V2 r' h, `: Z; reaseOut:减速到0的缓动;
/ T" ?/ w* L8 weaseInOut:前半段从0开始加速,后半段减速到0的缓动。
& d( n7 A. O- l其中Linear是无缓动效果,没有以上效果。- D# `. C7 Q+ j5 z
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, a: T# t+ r+ J$ ^6 L这是as代码,四个参数分别是:, _1 v& M# c8 w, q5 `& _
t: current time(当前时间);
+ T8 J/ i8 A1 ~% n5 d. _b: beginning value(初始值);2 J3 ]' X$ m" V/ L$ J0 H h
c: change in value(变化量);: @4 h$ t) e' L4 o7 Q8 d/ ~ r
d: duration(持续时间)。0 y1 H7 ?! Q d, t; Z- e
ps:Elastic和Back有其他可选参数,里面都有说明。6 o8 `5 K9 w, O) y3 l/ R2 Q
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那如何在js中利用这些算法呢?可以看到,虽然是as代码,但里面的程序是可以直接放在js里使用的。1 e* l, K e5 K( F7 ]1 n& ]' }
我们可以定义一个类,把它这部分放在里面:! Z2 \& N6 `: C# H# I; ?! b
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# z; v# C' @: ~& Y$ o- H[mw_shl_code=javascript,true]var Tween = {+ ~. _6 s4 W5 L* _1 y1 `* a! T/ P
Linear: function(t,b,c,d){ return c*t/d + b; },
+ N. r0 W, S6 J F& |& U Quad: {5 ^! g7 S- F# h/ M; m7 s3 q5 C
easeIn: function(t,b,c,d){
$ l: p* b$ R4 E, J' s1 S4 R return c*(t/=d)*t + b;2 `+ x) o6 C* Q% n" R
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easeOut: function(t,b,c,d){
# m* |0 d- _# t. e- l0 D5 J) x. H- r return -c *(t/=d)*(t-2) + b;
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easeInOut: function(t,b,c,d){ m* C5 r* ~- U! e: W' l
if ((t/=d/2) < 1) return c/2*t*t + b;
) R \! C, g+ `" ]& C/ U return -c/2 * ((--t)*(t-2) - 1) + b;
4 P k/ b) b, w$ c& z1 [" R }
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Cubic: {
) L4 ^0 k! c, G; b! T& }2 o. y$ E easeIn: function(t,b,c,d){# w; Z$ X5 H/ Z6 p1 r6 m7 @
return c*(t/=d)*t*t + b;
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easeOut: function(t,b,c,d){
" a5 l1 L7 g7 w) S$ I return c*((t=t/d-1)*t*t + 1) + b;
* @: U) o D- p' F! d8 ` },
7 X+ V. h# R, w$ R/ V) ]$ R easeInOut: function(t,b,c,d){5 `3 T; L% l! d8 B2 y
if ((t/=d/2) < 1) return c/2*t*t*t + b;
" ~" r+ T' f! V% q" Q9 O8 ] o: s return c/2*((t-=2)*t*t + 2) + b;% }8 U4 j' h2 x
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Quart: {3 H4 w) ]$ C3 b
easeIn: function(t,b,c,d){$ U9 Y7 ?% H- T
return c*(t/=d)*t*t*t + b;
7 u) w" O3 j5 B: h) `2 g6 ] Y6 Q( p },
# O: e/ M9 E& ]2 ]6 Y+ c* ` easeOut: function(t,b,c,d){2 M, X M* j4 |
return -c * ((t=t/d-1)*t*t*t - 1) + b;" F2 m) a( F0 \) P1 I2 P
},
. H) Y/ c* q. S' u5 M N4 y. {& t easeInOut: function(t,b,c,d){! S2 Q8 e; O3 z3 A g* Q$ p
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
9 D: h8 Z5 }+ H. v% H- A# u return -c/2 * ((t-=2)*t*t*t - 2) + b;
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Quint: {1 K- D+ c3 \6 ]3 x
easeIn: function(t,b,c,d){& B1 j2 I4 U4 p% p3 n
return c*(t/=d)*t*t*t*t + b;
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easeOut: function(t,b,c,d){) T. H- ~3 K2 G% c+ s2 ~5 V
return c*((t=t/d-1)*t*t*t*t + 1) + b;2 o2 d/ @/ C0 a
},
+ a, ~1 i$ M; k% H' Q/ m/ L5 F easeInOut: function(t,b,c,d){8 ~2 ~+ m* s7 N! i
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
! a `: \, T- K ?+ [) U3 R; X return c/2*((t-=2)*t*t*t*t + 2) + b;# J ?0 ?4 P) H3 A1 [' }/ b0 n
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Sine: {( y* L/ `" W1 c% o n; l( W
easeIn: function(t,b,c,d){" v) S" R! D' j6 @7 |" w% B
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;* _ j' j' n# ]
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easeOut: function(t,b,c,d){3 e* C! `0 Y+ R: S5 W
return c * Math.sin(t/d * (Math.PI/2)) + b;6 k p+ ]1 I8 \
},
: ` p( I, y7 O" q' q* I5 n) S7 U easeInOut: function(t,b,c,d){
$ Q. _0 L0 x3 a! `+ u. a/ f return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
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Expo: {) Z# I( Z; g! Y
easeIn: function(t,b,c,d){& I+ T+ q1 e ^8 l( a, W% I4 g
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;; _& c ?1 K0 V
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easeOut: function(t,b,c,d){
9 z- |+ N( e4 {- }% p2 } return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;8 L6 j) f: C, O3 `& G
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easeInOut: function(t,b,c,d){
$ q/ g* j" i1 p if (t==0) return b;& U9 L7 R) K* A
if (t==d) return b+c;
5 a" ]3 g0 l7 s {" d6 F9 d6 u if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
- b6 Y" Z; I6 K- A9 T7 J0 y& G return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;7 ~& _9 @) l3 k6 q q m
}
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7 w0 }& p+ o, Z3 m) K7 G" B Circ: {: `# e& Z/ i+ h& F* [7 @) S, o- z# A0 x
easeIn: function(t,b,c,d){
/ F, a8 n& C% \. l G% {7 h return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
/ A, P! D1 ^$ O1 f9 d- V/ c- P6 F },
7 f( ^# `2 \8 Q" S- ]" n1 J easeOut: function(t,b,c,d){
! P5 _' G5 U5 h0 t) P return c * Math.sqrt(1 - (t=t/d-1)*t) + b;) N( [) g8 \+ W8 ~. I& p1 R
},
. f5 a( l' G A4 @9 k' y( Y0 T- m easeInOut: function(t,b,c,d){+ _. _6 A# w. v1 M
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
9 n& e7 [* l+ U# o$ T3 D- L return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
) z7 l' ~& B+ G }
- w V" a6 t/ Y- L2 |3 M4 | },
* k$ [- K* U' B4 o' H8 l Elastic: {
! b- u/ R2 I; t4 z% a$ U8 p: D easeIn: function(t,b,c,d,a,p){! P4 P& i+ u @: O. h: {* J
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;& }$ F" u* U' x; @8 ]* ^
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }8 u' Y4 y( ]- a, H1 M
else var s = p/(2*Math.PI) * Math.asin (c/a);
: M; \, d+ r2 A) M return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;) @5 l, G G. e
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easeOut: function(t,b,c,d,a,p){
+ a* n& V$ I0 M% `! F0 m6 T if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
; A+ |2 d8 Q( L( E8 k7 \! V, p if (!a || a < Math.abs(c)) { a=c; var s=p/4; }& D* d9 n T. D
else var s = p/(2*Math.PI) * Math.asin (c/a);% S+ F+ H8 h: a9 J% x
return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
* U9 Z- d" @" z8 s },, U8 y1 M2 t4 N$ L7 a* k9 C3 Q( }
easeInOut: function(t,b,c,d,a,p){9 e' I1 P' n+ J) D1 m7 W
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
: R+ ^/ t: j9 D/ S2 |5 k" [! p2 A: u if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
4 g. z" s0 v2 n O3 H" }7 f else var s = p/(2*Math.PI) * Math.asin (c/a);$ ]2 Y4 i: L) E
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
' A; x7 Y( b3 e0 K2 S ]6 G return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;* P9 o1 z# t. G( B2 ~) g
}
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Back: {
# ] F8 R) I" D' V9 q& n easeIn: function(t,b,c,d,s){
. g' ]& J8 u4 m# L if (s == undefined) s = 1.70158;/ [- p6 t5 m9 n
return c*(t/=d)*t*((s+1)*t - s) + b;
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easeOut: function(t,b,c,d,s){4 l. b0 _* k! w6 ~ s8 p: H
if (s == undefined) s = 1.70158;
3 R( f% B5 ]2 n return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;( B! L( B( }& i# F
},
8 n( f7 \4 h1 O# ?9 a$ F* _ easeInOut: function(t,b,c,d,s){- q1 N( p: L, S G% ]: l
if (s == undefined) s = 1.70158;
; C* k4 \9 H8 t if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
9 p7 @5 K6 l X8 Z9 H return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
! Z7 }+ o% {- ]+ R( m }
* k$ x8 u: e! r% ]. d },% {& p' W9 I4 o& M1 A; X$ [
Bounce: {
% v8 O: M9 x9 U- y5 }' [8 i easeIn: function(t,b,c,d){2 j' @ b+ |1 m1 K" T" t
return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;/ O$ C6 I+ V0 q' V& O+ B; g
},
2 P4 @3 o% h# z$ e$ M# o easeOut: function(t,b,c,d){2 Q- i7 L; F% E9 v7 Y4 `+ j
if ((t/=d) < (1/2.75)) {
( c9 r8 \8 R5 A9 b$ a. q return c*(7.5625*t*t) + b;
4 m* J+ `& z5 R# c6 w9 [# V } else if (t < (2/2.75)) {7 N% V1 v* a! T: e! [! y
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
* t) @1 A& s1 M! q4 H D" z } else if (t < (2.5/2.75)) {; A, P5 B8 Q/ \( a+ f
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;6 C6 N) R+ n, _! u R
} else {
* a; P, `/ { H+ _9 T return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;. L4 Z. N& b3 c" E4 p. r1 C
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},
7 {$ w. K% Y9 t; d4 Z easeInOut: function(t,b,c,d){$ F) B( y* Q. w; B% L4 }
if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
5 _5 |4 K7 f. |* R8 v else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;( j2 l( }* H* k9 A5 k9 o1 U4 k0 d
}
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}[/mw_shl_code]
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