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动画库tween.js# [) ^& L$ I" r
D G, @: \) I. ]相关资料 http://robertpenner.com/easing/
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Linear:无缓动效果; c, V$ l2 \) d! W0 r; Q4 P
Quadratic:二次方的缓动(t^2);
! \4 n% A: c# N+ \: sCubic:三次方的缓动(t^3);
) Y& G% a. S1 r/ ~Quartic:四次方的缓动(t^4);
9 x3 n9 ?$ _3 ?; k/ c KQuintic:五次方的缓动(t^5); E" V( K0 C% s6 ]. y' k
Sinusoidal:正弦曲线的缓动(sin(t));2 `( g9 Y1 @7 X7 q
Exponential:指数曲线的缓动(2^t);
. F" M! Q0 K! }9 Y# wCircular:圆形曲线的缓动(sqrt(1-t^2));
& Z0 Z0 n' f1 X: I' b tElastic:指数衰减的正弦曲线缓动;) L+ @: ~1 }5 N: K, z; D; q# G
Back:超过范围的三次方缓动((s+1)*t^3 - s*t^2);4 [( G M y5 d! V! N7 c/ y* F
Bounce:指数衰减的反弹缓动。
3 U u7 d5 _% r# a+ tps:以上都是自己的烂翻译,希望各位修正。$ m7 f, ?: `4 F- n
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每个效果都分三个缓动方式(方法),分别是:
r3 Z# r Z9 Q2 o W) l weaseIn:从0开始加速的缓动;: n% R+ R/ l5 l# H
easeOut:减速到0的缓动;% h1 E! S( G& a8 O# |
easeInOut:前半段从0开始加速,后半段减速到0的缓动。8 e' a* U2 i, a0 {, o' ^- }; o/ r1 `8 Q
其中Linear是无缓动效果,没有以上效果。3 Y, d5 b; E" z3 h2 A4 W% s
$ W9 C# h% c0 K( n+ y
7 O- ~% s, `0 \2 v& V. _这是as代码,四个参数分别是:5 S/ B4 o; S: i' B! a
t: current time(当前时间); \ B# p, e* Y; _& `
b: beginning value(初始值);
- P9 L4 A# G2 N& X9 ]c: change in value(变化量);# u/ D- b% |! ^/ m. v
d: duration(持续时间)。
. W1 k# @, Q" M7 n) I- Ups:Elastic和Back有其他可选参数,里面都有说明。) u$ j5 q, }! h
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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。7 Y7 [# k4 I; t6 b; M' N M3 }
我们可以定义一个类,把它这部分放在里面:. E# i# s6 h3 P5 f1 v$ i3 a: F
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& {! R4 U- B, q[mw_shl_code=javascript,true]var Tween = {) V2 x2 O4 |5 A2 v# K* s' J
Linear: function(t,b,c,d){ return c*t/d + b; },
% `/ L" Z" c) v Quad: {+ c7 W0 T: V/ ]7 ]
easeIn: function(t,b,c,d){
9 l* f& I1 f; h: ]; d; i: | return c*(t/=d)*t + b;
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easeOut: function(t,b,c,d){
d: G( l% ]* O" h- ~! O& X% _ return -c *(t/=d)*(t-2) + b;
* g9 Q$ e% ~2 }1 d },
5 b. ^6 _# Z! h easeInOut: function(t,b,c,d){
6 x; A- _' ~6 O7 y7 z6 e/ _ if ((t/=d/2) < 1) return c/2*t*t + b;
8 ~# F+ ?9 p* M! I9 b9 _3 z' M/ y# J/ H return -c/2 * ((--t)*(t-2) - 1) + b;
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},& t1 j8 U9 K3 m/ j9 C- m& ]
Cubic: {! h# H; u, J* @, n
easeIn: function(t,b,c,d){
8 H4 O" Z: q# K- o/ o0 w' z9 v return c*(t/=d)*t*t + b;: k% b7 o9 O' R- F' o4 X
},
* H6 ]; l V$ {& v easeOut: function(t,b,c,d){
' m9 f* W0 A. [, o( q0 c9 ]9 S return c*((t=t/d-1)*t*t + 1) + b;. `' `. C: K( _8 i- j: u- H
},
0 e5 a/ g* l0 t2 b+ l/ S easeInOut: function(t,b,c,d){
8 B$ a2 J8 h' B, ^" w# i if ((t/=d/2) < 1) return c/2*t*t*t + b;. d7 g* z+ {6 s1 y4 @
return c/2*((t-=2)*t*t + 2) + b;) ^. J, X$ n& O% S# I
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},
t* [6 f0 X" N% h( O Quart: {
! k# ?& t0 z# Y' `4 k+ ~ easeIn: function(t,b,c,d){7 Y7 n& e' b: g. [% ~
return c*(t/=d)*t*t*t + b;
+ |. E! Y( i2 H+ p/ q7 S4 Z1 _ P },
# N! Q% Y$ U5 c' H3 Q. ` easeOut: function(t,b,c,d){
H1 v0 Y4 d" C' u& t. M return -c * ((t=t/d-1)*t*t*t - 1) + b;
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easeInOut: function(t,b,c,d){
9 N1 Y4 V& l5 r if ((t/=d/2) < 1) return c/2*t*t*t*t + b;% V4 u0 j, A* e9 @- J6 p8 g
return -c/2 * ((t-=2)*t*t*t - 2) + b;
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Quint: {# \, q) t, U, O, s
easeIn: function(t,b,c,d){
2 C! ~" P, k4 O: w6 w, y& j+ U return c*(t/=d)*t*t*t*t + b;8 w, G+ [8 m7 b/ G5 c
}," B# z+ C3 T; u% G
easeOut: function(t,b,c,d){8 S2 e8 V# l$ c
return c*((t=t/d-1)*t*t*t*t + 1) + b;- q, y/ _$ Y9 y1 v. n, D
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easeInOut: function(t,b,c,d){7 D' B! o* U- s3 p* n) A
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
. q+ e& \4 u, }$ z return c/2*((t-=2)*t*t*t*t + 2) + b;
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Sine: {3 O0 y X0 Z% R. E, H4 x9 Q+ R {
easeIn: function(t,b,c,d){
, |' V( t' |7 K% [7 T6 V return -c * Math.cos(t/d * (Math.PI/2)) + c + b;6 R2 O2 l+ ]$ a7 `
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easeOut: function(t,b,c,d){
2 s$ A) k' t, X6 g ]% L return c * Math.sin(t/d * (Math.PI/2)) + b;; X& }/ j0 C/ s' a3 A5 O: z
},
4 e4 }# e1 `1 \4 ?* X easeInOut: function(t,b,c,d){
! p7 m+ ]; J8 Y. { return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;$ y0 G; b5 o3 b+ H' y
}
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easeIn: function(t,b,c,d){
2 p% |$ L# L0 }! r" w# i/ v return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;5 m8 E7 ?4 @: g6 q1 F# H
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easeOut: function(t,b,c,d){7 j, n3 ]: |- \. y1 [- T/ j2 R
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;4 u5 ?' Y4 A: `0 E: C
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easeInOut: function(t,b,c,d){& O# e+ l/ `0 U/ b0 D
if (t==0) return b;
- c0 d. Y9 B; v if (t==d) return b+c;* O: X- Y, h5 E
if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
: N9 U- S# s% o+ s+ F' m return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
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Circ: {8 D& {/ c# m2 u; B! g+ \/ b5 {
easeIn: function(t,b,c,d){% R7 q4 @" L' M4 @+ \' O! m N
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
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easeOut: function(t,b,c,d){5 u# U% i' K/ c1 k) t0 W
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;4 m8 X m% E/ l# ?8 C6 I
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easeInOut: function(t,b,c,d){+ y! F# {" R2 p. W. C( z
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
( o5 f/ g# A& s7 @1 ~' i6 l return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;( g7 P0 y( y1 W4 p( D! M
}
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Elastic: {, e! [) K0 s) Z
easeIn: function(t,b,c,d,a,p){- R, e# j `" o* c& [
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;, E$ j8 a. y; L9 x# E
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
8 f* j' n( B. P2 ^- Z6 g else var s = p/(2*Math.PI) * Math.asin (c/a);
S& W% h+ t5 x4 b8 [0 _ return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
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easeOut: function(t,b,c,d,a,p){+ Q, G. r# `: l
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
" v; @) s* b2 ^6 b% c2 d if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
2 Q2 k" ]& }5 s+ V+ n( |( k( w# y else var s = p/(2*Math.PI) * Math.asin (c/a);
3 Y# Y! H, A; H( j% s8 `: @2 N return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);7 f$ z8 `" Q: m; _& H; j
},! Q" N7 r! n; l6 M
easeInOut: function(t,b,c,d,a,p){6 {. V( ^% f7 N1 \2 C3 s0 t3 f
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);8 E# c% ~9 z9 N9 t* y
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
5 y% i: t4 r8 w& t* S3 P else var s = p/(2*Math.PI) * Math.asin (c/a);
+ t* ]4 s3 A) A7 S4 X9 @ if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
) J; A; g$ u: |$ Y7 b% p* K g1 D return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b; P+ z# n3 r' j: B! e
}
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9 y5 U3 O, N% V: A/ {. q Back: {5 q% k F* d [/ z1 d Q
easeIn: function(t,b,c,d,s){
' w! R) N$ @$ ] if (s == undefined) s = 1.70158;( N0 f/ F$ V$ i2 e
return c*(t/=d)*t*((s+1)*t - s) + b;- i9 d+ N$ k; I' [: a3 O6 ^
},
; H. i0 d( S, [ easeOut: function(t,b,c,d,s){' M1 ^8 o% M( m( a
if (s == undefined) s = 1.70158;% ~5 n3 n) G" T9 ]: B6 e! w) v
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; i6 v" O" o% C' P7 C6 T, {. g
},, X! g. _9 i( a* \( k
easeInOut: function(t,b,c,d,s){
% y( T* X; T' s, R$ B5 d% a+ y if (s == undefined) s = 1.70158; 8 j. g/ |6 r$ \& e9 p
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
/ r$ T o1 l+ ^( _! w return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;4 x& s, D+ u% }: f/ X
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},% I# ^7 o+ V' ]& \: ^1 O# }
Bounce: {! _4 k k7 }. B- Z5 b4 I# f& E
easeIn: function(t,b,c,d){$ d$ F, b6 X0 D% }% k+ t" Y8 n1 ^
return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;2 A8 O! W5 n0 p- T8 q
},
% h, e n5 d* E- n easeOut: function(t,b,c,d){
5 t. a/ J1 E" B O if ((t/=d) < (1/2.75)) {" h% p& o( E5 V& |) Y' x
return c*(7.5625*t*t) + b;
* q' X" O# R, I/ q' d } else if (t < (2/2.75)) {" f& Q1 ?, c/ \/ i& e
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;0 R. L6 \, v: _6 J
} else if (t < (2.5/2.75)) {
, |% E$ p2 F( \) S+ j! f return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
# w% ^! z$ Y# _, y( F } else {* w# J% x8 j1 P
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;" y Y+ U$ |! N) k. [
}
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easeInOut: function(t,b,c,d){% c% x6 } m9 r8 K! _
if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
9 U7 e" o2 O2 I! m' }4 l, r* y else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;8 r* H. i/ g% o/ a, N
}
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}[/mw_shl_code]( \: Z5 c$ h4 }+ B* ?$ b! k
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