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& G, r4 l- E8 e, J1 F7 Q* g- l动画库tween.js
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相关资料 http://robertpenner.com/easing/
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Linear:无缓动效果;
* k6 {- A, k# BQuadratic:二次方的缓动(t^2);' @( A0 Y4 b0 q4 A
Cubic:三次方的缓动(t^3);+ }' k9 f# m( F; P
Quartic:四次方的缓动(t^4);
[, V8 D) S% J+ a0 n! O/ k1 H* uQuintic:五次方的缓动(t^5);8 M7 V- ]) [7 |- d$ S9 W8 T
Sinusoidal:正弦曲线的缓动(sin(t));9 y8 ^! G, H! ~5 e! P
Exponential:指数曲线的缓动(2^t);8 g. e) b) y L
Circular:圆形曲线的缓动(sqrt(1-t^2));) L# d" Z2 L5 h4 J& a+ o
Elastic:指数衰减的正弦曲线缓动;
# b5 S) q! I: ]+ Q9 L) b2 rBack:超过范围的三次方缓动((s+1)*t^3 - s*t^2);
8 p( p1 u2 i' g6 p, [/ uBounce:指数衰减的反弹缓动。2 l6 a9 G+ Z/ [% H2 m) S
ps:以上都是自己的烂翻译,希望各位修正。$ G. O. d: s- x% Q ]
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每个效果都分三个缓动方式(方法),分别是:
& J( A9 L! r7 n8 v4 YeaseIn:从0开始加速的缓动;) B! Z' z s' O9 {# W+ }6 q
easeOut:减速到0的缓动; [. a5 ?* g! x/ N/ |
easeInOut:前半段从0开始加速,后半段减速到0的缓动。2 y6 h, U8 D- [, `7 o
其中Linear是无缓动效果,没有以上效果。
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这是as代码,四个参数分别是:) n- ~1 a! v0 J3 A5 }' s3 O5 q0 n
t: current time(当前时间);
! G/ h5 }& \) H G& fb: beginning value(初始值);
% m9 _& Z8 o/ S3 u' [0 M6 uc: change in value(变化量);
# @" S- f& C% x! ^4 pd: duration(持续时间)。3 j. w) Z. M% m/ ^4 I. o
ps:Elastic和Back有其他可选参数,里面都有说明。
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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。3 |& G0 p8 ]' @, s
我们可以定义一个类,把它这部分放在里面:- v: j$ ?, O9 K+ u! U6 f4 t; b
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9 r5 q4 N! l& a[mw_shl_code=javascript,true]var Tween = {* k9 P/ ]. E9 F9 Q2 i
Linear: function(t,b,c,d){ return c*t/d + b; },
; u4 I! q8 b, w! R. g' b Quad: {
! J! a* F0 x- C, _3 y! n easeIn: function(t,b,c,d){
' [; d! Q$ a1 X# { return c*(t/=d)*t + b;
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easeOut: function(t,b,c,d){
1 b" R( r9 ^$ d* l; Y return -c *(t/=d)*(t-2) + b;
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easeInOut: function(t,b,c,d){' J, F& z& O! n) [+ M+ {; s k
if ((t/=d/2) < 1) return c/2*t*t + b;
( X2 u8 R/ Z% L, t! ?9 o6 k0 H return -c/2 * ((--t)*(t-2) - 1) + b;
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},
$ k( F: H! f9 X6 _* g Cubic: {
: v/ V/ _+ u; M1 t, S4 ~ easeIn: function(t,b,c,d){
/ i! ^, l: \8 V! M* q2 p# [2 M return c*(t/=d)*t*t + b;' s& K5 I) M. x/ Q6 L
},
- _9 V6 s/ ]! M6 r. I4 G# V easeOut: function(t,b,c,d){
+ S" ~1 R! Y% Y. N# I return c*((t=t/d-1)*t*t + 1) + b;% t) P7 F# u8 o" `; W6 B
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easeInOut: function(t,b,c,d){3 v1 c: x. r7 G# e' f3 X% Q
if ((t/=d/2) < 1) return c/2*t*t*t + b;' ]& W: k5 j. v- A- l* v
return c/2*((t-=2)*t*t + 2) + b;
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Quart: {
8 ^+ o0 x9 c( b0 M! | easeIn: function(t,b,c,d){
$ y, I6 T: k; o8 O- ~2 P/ Y3 g: u return c*(t/=d)*t*t*t + b;
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easeOut: function(t,b,c,d){& j4 c0 p4 R1 J; e
return -c * ((t=t/d-1)*t*t*t - 1) + b;
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+ U- w& D6 G0 _/ x easeInOut: function(t,b,c,d){9 |. j# P5 t* E1 @% E, k# c7 i
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
7 _, d- ^5 ?! q return -c/2 * ((t-=2)*t*t*t - 2) + b;- G' L. h2 V0 B0 ?
}
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Quint: {; `0 e' w* R; ?; J3 L
easeIn: function(t,b,c,d){
: t% I% R. R+ c8 v return c*(t/=d)*t*t*t*t + b;
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" V& j T2 d( C* f) D0 v& [; p5 F2 S easeOut: function(t,b,c,d){$ ?+ b/ J% J" J8 O+ \* c
return c*((t=t/d-1)*t*t*t*t + 1) + b;
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easeInOut: function(t,b,c,d){
9 s" [; J+ u# o3 Q$ V K if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
( o, ?( u! ~" h; E return c/2*((t-=2)*t*t*t*t + 2) + b;1 b6 w! q. s, @ y3 T9 z- Y9 i
}
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) J/ F7 T, x L/ b! F. W Sine: {1 X( N. a: }5 T6 e# o5 i0 ~2 m. r
easeIn: function(t,b,c,d){
# _: W) i# r0 v: u3 J$ c; R return -c * Math.cos(t/d * (Math.PI/2)) + c + b;* H' I8 [% u* C. C# P8 `: @
},
- j" U0 ^/ `" X! d9 V( U+ M easeOut: function(t,b,c,d){
# ?- E2 H! s; T: a( ]' M( A: H return c * Math.sin(t/d * (Math.PI/2)) + b;7 P# ~4 b, T) B0 J0 ?7 k! `+ }
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easeInOut: function(t,b,c,d){4 N# T. b# N. M# h+ B# a; f6 q
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
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},) n7 o4 O3 V8 _9 c
Expo: {/ g. Z+ m1 b3 r2 ^- ` I! T
easeIn: function(t,b,c,d){8 ^+ y" G9 w5 @" h& U2 z
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;3 W0 A. f! M7 X" r. c |7 R
},
3 G% P$ e) {+ S3 `- \ easeOut: function(t,b,c,d){; _+ Y4 z0 q4 X1 \
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
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easeInOut: function(t,b,c,d){
' y; q) d5 X% j. i) M if (t==0) return b;
. s3 I/ Z; c7 t% J% s6 k" N if (t==d) return b+c;
# z, w% @1 T( c4 h t t9 o$ `0 b6 [ if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;9 z/ R3 L; m/ M1 T6 {% e F s
return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
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7 n" c9 X3 O$ \ },
/ M1 w; T7 X6 Z& G, I9 ? Circ: {
. a/ W. j) n" P easeIn: function(t,b,c,d){
5 a+ e1 }( D/ w% N0 w9 `4 z; L5 Q, A return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;+ K" H$ N; ~1 d0 o& ?
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easeOut: function(t,b,c,d){' o1 d9 W$ I3 p1 a
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;) m; p" z3 q# D" {7 c/ ^( G
},
9 R" P3 r1 x* r) v4 k6 [/ Y% X/ a easeInOut: function(t,b,c,d){
2 V& @6 e' n$ X C7 p' S' z2 f$ x5 u if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;! G1 R3 O5 j9 u8 `0 b
return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
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Elastic: {
5 L' `9 d1 f9 d. r& _ easeIn: function(t,b,c,d,a,p){
6 `* q3 h* O) f! \3 q& C" M if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
1 a3 U% I+ u$ Z" W1 u if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
- p; t% V- S) y" { else var s = p/(2*Math.PI) * Math.asin (c/a);, L7 l* e' X. G- \) s6 X
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;" C1 W1 ?# G! v
},
. V; n6 x& r% N4 R" J; |4 s easeOut: function(t,b,c,d,a,p){4 J- ~! d4 Y2 A( [; e; r
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;# O; G3 A1 f# [$ {; x* p) I- \
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }$ e- w, i, a8 L
else var s = p/(2*Math.PI) * Math.asin (c/a);
2 k9 D0 ~0 C' V! k" \" S return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);4 Z9 I5 i0 M6 U8 c, m+ P! R
},
; S& d% z& t' C8 X4 e' q easeInOut: function(t,b,c,d,a,p){' o- i. B7 p7 @( ~9 v0 l# v N
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
# m7 c& V1 R4 g" A if (!a || a < Math.abs(c)) { a=c; var s=p/4; }: W( u( E9 N" q
else var s = p/(2*Math.PI) * Math.asin (c/a);4 b- O) n: |9 @; t
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
: F7 V h$ l( r F( F9 Y/ p& c return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;9 R" U8 B! B+ y! D: G& j
}
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Back: {
& O# Z( t0 X8 C2 ^% s* O easeIn: function(t,b,c,d,s){
/ h+ i% Q, ?& _* \4 j7 v if (s == undefined) s = 1.70158;, p5 a: d: x b. i& G
return c*(t/=d)*t*((s+1)*t - s) + b;
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easeOut: function(t,b,c,d,s){2 H6 D) C: d+ i& h
if (s == undefined) s = 1.70158;
& ]2 R4 H" ]' t+ ^, N return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;& f0 k, r, K# D
},
4 Q: S5 X- @, a4 h; a easeInOut: function(t,b,c,d,s){
: k* a8 I+ J. D; N z if (s == undefined) s = 1.70158; : ?/ `# w' P, T" U% _
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
' |. M. w3 g5 o# [ return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
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},; X+ k J( c; A* w ?
Bounce: {
9 K2 @+ Q% {& z* E" O# ^4 k easeIn: function(t,b,c,d){
2 Q+ v, ~# j* _% B7 a return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;
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easeOut: function(t,b,c,d){( `1 y3 c- f y! K4 k& f
if ((t/=d) < (1/2.75)) {; A2 C/ ]* F& c* F, m4 j
return c*(7.5625*t*t) + b;
' A C& t3 q. H- D y } else if (t < (2/2.75)) {
9 q% X) ]- D! A) @# Z9 E6 v* {, l return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
# ]$ j& g( E) W) y2 G7 Z } else if (t < (2.5/2.75)) {* g" S8 O. S5 X# R4 y- ^
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
( O2 j+ V) M7 @9 R0 u } else {$ u: G E* d4 B4 z( y/ V
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;- K8 x; s5 L8 U
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},
: E$ z$ X( D1 ]* N" Y1 o easeInOut: function(t,b,c,d){ \* M$ T8 T$ \3 e5 j4 U- o% }/ i: L% ?
if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
" a8 }' \3 H/ E else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;2 z5 c8 s M' a4 K
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}[/mw_shl_code]
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