1 /**
2 * Created by guoyongfeng on 2014/7/7.
3 * @Author guoyongfeng
4 * @Date 2014-07-07
5 * @Version 1.0.0
6 * @update 2014-07-07
7 * @described tween动画库函数封装
8 *
9 */
10 define('animate/0.0.1', function(){
11 /**
12 *
13 */
14 return function(ele, json, duration, effect, fnCallBack){
15 //对传参effect进行判断，并将获得的方法统一赋值给action方法
16 //对传参的判断可以实现js的重载功能。
17 var action=null;
18 if(typeof effect =="number"){
19 //1 buffer,2 flex,3 bounce 4 linear
20 switch(effect){
21 case 1:
22 action=moveEffect.Exponential.easeOut;
23 break;
24 case 2:
25 action=moveEffect.Elastic.easeOut;
26 break;
27 case 3:
28 action=moveEffect.Bounce.easeOut;
29 break;
30 case 4:
31 action=moveEffect.Linear;
32 break;
33 default:
34 break;
35 }
36 }else if(typeof effect == 'string'){
37 switch(effect){
38 case 'Exponential':
39 action=moveEffect.Exponential.easeOut;
40 break;
41 case 'Elastic':
42 action=moveEffect.Elastic.easeOut;
43 break;
44 case 'Bounce':
45 action=moveEffect.Bounce.easeOut;
46 break;
47 case 'Linear':
48 action=moveEffect.Linear;
49 break;
50 default:
51 break;
52 }
53
54 }else if(typeof effect == "function"){
55 //参数effect是个函数，则默认为这是回调函数，并采用默认的运动效果
56 fnCallback=effect;
57 }else if(effect instanceof Array){
58 //输入格式：['Expo','easeOut']
59 if(effect.length===2){
60 action=moveEffect[effect[0]][effect[1]];
61 }else if(effect.length==1){
62 action=moveEffect.Linear;
63 }
64 }else{
65 action=moveEffect.Exponential.easeOut;
66 }
67
68 //获取初试值
69 var oBegin={};
70 var oChange={};
71 for(var attr in json){
72 var begin=0, change=0, count=0;
73 if(attr == 'opacity'){
74 begin=Math.random((parseFloat(getStyle(ele, attr)))*100);
75 change=json[attr]-begin;
76 if(begin == 'undefined'){
77 ele.style[attr]='alpha(opacity:100)';
78 ele.style.opacity=1;
79 }
80 }else{
81 begin=parseInt(getStyle(ele, attr));
82 change=json[attr]-begin;
83 }
84 //保存
85 if(change){
86 count++;
87 oBegin[attr]=begin;
88 oChange[attr]=change;
89 }
90 }
91 //判断所有变量是否到齐
92 if(count == 0){
93 if(typeof fnCallBack == 'function'){
94 fnCallBack.call(ele);
95 }else{
96 return ;
97 }
98 }
99
100 //封装运动函数
101 var times=0;
102 var interval=30;
103 move();
104
105 function move(){
106 clearInterval(ele.timer);
107 times+=interval;
108
109 if(times<=duration){
110 for(var attr in json){
111 //var val=times*oChange[attr]/duration+oBegin[attr];
112 var val=action(times, oBegin[attr], oChange[attr], duration);
113 if(attr == 'opacity'){
114 ele.style[attr]=val/100;
115 ele.style.filter="alpha(opacity="+val+")";
116 }else{
117 ele.style[attr]=val+'px';
118 }
119 }
120 ele.timer=window.setInterval(move, interval);
121 }else{
122 if(attr == 'opacity'){
123 ele.style[attr]=json[attr]/100;
124 ele.style.filter="alpha(opacity="+json[attr]+")";
125 }else{
126 ele.style[attr]=json[attr]+'px';
127 }
128 //回调函数
129 if(typeof fnCallBack == 'function'){
130 fnCallBack.call(ele);
131 }
132
133 ele.timer=null;
134 }
135 }
136
137 //获取css样式的兼容性写法
138 function getStyle(obj, attr){
139 if(obj.currentStyle){
140 return obj.currentStyle[attr];
141 }else{
142 return getComputedStyle(obj, null)[attr];
143 }
144 }
145
146 }
147
148 //思路：当前时间*变化量/持续时间+初始值
149 var moveEffect = {
150 //1.线性运动
151 Linear: function(t,b,c,d){
152 return c*t/d + b;
153 },
154 //2.二次方的缓动（t^2）；
155 Quadratic: {
156 easeIn: function(t,b,c,d){
157 return c*(t/=d)*t + b;
158 },
159 easeOut: function(t,b,c,d){
160 return -c *(t/=d)*(t-2) + b;
161 },
162 easeInOut: function(t,b,c,d){
163 if ((t/=d/2) < 1) return c/2*t*t + b;
164 return -c/2 * ((--t)*(t-2) - 1) + b;
165 }
166 },
167 //3.三次方的缓动（t^3）
168 Cubic: {
169 easeIn: function(t,b,c,d){
170 return c*(t/=d)*t*t + b;
171 },
172 easeOut: function(t,b,c,d){
173 return c*((t=t/d-1)*t*t + 1) + b;
174 },
175 easeInOut: function(t,b,c,d){
176 if ((t/=d/2) < 1) return c/2*t*t*t + b;
177 return c/2*((t-=2)*t*t + 2) + b;
178 }
179 },
180 //4.四次方的缓动（t^4）；
181 Quartic: {
182 easeIn: function(t,b,c,d){
183 return c*(t/=d)*t*t*t + b;
184 },
185 easeOut: function(t,b,c,d){
186 return -c * ((t=t/d-1)*t*t*t - 1) + b;
187 },
188 easeInOut: function(t,b,c,d){
189 if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
190 return -c/2 * ((t-=2)*t*t*t - 2) + b;
191 }
192 },
193 //5.五次方的缓动（t^5）；
194 Quintic: {
195 easeIn: function(t,b,c,d){
196 return c*(t/=d)*t*t*t*t + b;
197 },
198 easeOut: function(t,b,c,d){
199 return c*((t=t/d-1)*t*t*t*t + 1) + b;
200 },
201 easeInOut: function(t,b,c,d){
202 if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
203 return c/2*((t-=2)*t*t*t*t + 2) + b;
204 }
205 },
206 //6.正弦曲线的缓动sin(t)
207 Sinusoidal: {
208 easeIn: function(t,b,c,d){
209 return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
210 },
211 easeOut: function(t,b,c,d){
212 return c * Math.sin(t/d * (Math.PI/2)) + b;
213 },
214 easeInOut: function(t,b,c,d){
215 return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
216 }
217 },
218 //7.指数曲线的缓动（2^t）；
219 Exponential: {
220 easeIn: function(t,b,c,d){
221 return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
222 },
223 easeOut: function(t,b,c,d){
224 return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
225 },
226 easeInOut: function(t,b,c,d){
227 if (t==0) return b;
228 if (t==d) return b+c;
229 if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
230 return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
231 }
232 },
233 //8.圆形曲线的缓动（sqrt(1-t^2)）；
234 Circular: {
235 easeIn: function(t,b,c,d){
236 return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
237 },
238 easeOut: function(t,b,c,d){
239 return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
240 },
241 easeInOut: function(t,b,c,d){
242 if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
243 return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
244 }
245 },
246 //9.指数衰减的正弦曲线缓动；
247 Elastic: {
248 easeIn: function(t,b,c,d,a,p){
249 if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
250 if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
251 else var s = p/(2*Math.PI) * Math.asin (c/a);
252 return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
253 },
254 easeOut: function(t,b,c,d,a,p){
255 if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
256 if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
257 else var s = p/(2*Math.PI) * Math.asin (c/a);
258 return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
259 },
260 easeInOut: function(t,b,c,d,a,p){
261 if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
262 if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
263 else var s = p/(2*Math.PI) * Math.asin (c/a);
264 if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
265 return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
266 }
267 },
268 //10.超过范围的三次方缓动（(s+1)*t^3 - s*t^2）；
269 Back: {
270 easeIn: function(t,b,c,d,s){
271 if (s == undefined) s = 1.70158;
272 return c*(t/=d)*t*((s+1)*t - s) + b;
273 },
274 easeOut: function(t,b,c,d,s){
275 if (s == undefined) s = 1.70158;
276 return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
277 },
278 easeInOut: function(t,b,c,d,s){
279 if (s == undefined) s = 1.70158;
280 if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
281 return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
282 }
283 },
284 //11.指数衰减的反弹缓动。
285 Bounce: {
286 easeIn: function(t,b,c,d){
287 return c - moveEffect.Bounce.easeOut(d-t, 0, c, d) + b;
288 },
289 easeOut: function(t,b,c,d){
290 if ((t/=d) < (1/2.75)) {
291 return c*(7.5625*t*t) + b;
292 } else if (t < (2/2.75)) {
293 return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
294 } else if (t < (2.5/2.75)) {
295 return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
296 } else {
297 return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
298 }
299 },
300 easeInOut: function(t,b,c,d){
301 if (t < d/2) return moveEffect.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
302 else return moveEffect.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
303 }
304 }
305 };
306 });
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