Clip.js
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/**
* 动画主控制器
* @config target 动画对象，可以是数组，如果是数组的话会批量分发onframe等事件
* @config life(1000) 动画时长
* @config delay(0) 动画延迟时间
* @config loop(true)
* @config gap(0) 循环的间隔时间
* @config onframe
* @config easing(optional)
* @config ondestroy(optional)
* @config onrestart(optional)
*
* TODO pause
*/
import easingFuncs from './easing';
function Clip(options) {
this._target = options.target;
// 生命周期
this._life = options.life || 1000;
// 延时
this._delay = options.delay || 0;
// 开始时间
// this._startTime = new Date().getTime() + this._delay;// 单位毫秒
this._initialized = false;
// 是否循环
this.loop = options.loop == null ? false : options.loop;
this.gap = options.gap || 0;
this.easing = options.easing || 'Linear';
this.onframe = options.onframe;
this.ondestroy = options.ondestroy;
this.onrestart = options.onrestart;
this._pausedTime = 0;
this._paused = false;
}
Clip.prototype = {
constructor: Clip,
step: function (globalTime, deltaTime) {
// Set startTime on first step, or _startTime may has milleseconds different between clips
// PENDING
if (!this._initialized) {
this._startTime = globalTime + this._delay;
this._initialized = true;
}
if (this._paused) {
this._pausedTime += deltaTime;
return;
}
var percent = (globalTime - this._startTime - this._pausedTime) / this._life;
// 还没开始
if (percent < 0) {
return;
}
percent = Math.min(percent, 1);
var easing = this.easing;
var easingFunc = typeof easing === 'string' ? easingFuncs[easing] : easing;
var schedule = typeof easingFunc === 'function'
? easingFunc(percent)
: percent;
this.fire('frame', schedule);
// 结束
if (percent === 1) {
if (this.loop) {
this.restart(globalTime);
// 重新开始周期
// 抛出而不是直接调用事件直到 stage.update 后再统一调用这些事件
return 'restart';
}
// 动画完成将这个控制器标识为待删除
// 在Animation.update中进行批量删除
this._needsRemove = true;
return 'destroy';
}
return null;
},
restart: function (globalTime) {
var remainder = (globalTime - this._startTime - this._pausedTime) % this._life;
this._startTime = globalTime - remainder + this.gap;
this._pausedTime = 0;
this._needsRemove = false;
},
fire: function (eventType, arg) {
eventType = 'on' + eventType;
if (this[eventType]) {
this[eventType](this._target, arg);
}
},
pause: function () {
this._paused = true;
},
resume: function () {
this._paused = false;
}
};
export default Clip;