spritejs/spritejs

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        define([], factory);
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        exports["Animator"] = factory();
    else
        root["Animator"] = factory();
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/* 0 */
/***/ (function(module, exports) {

var g;

// This works in non-strict mode
g = (function() {
    return this;
})();

try {
    // This works if eval is allowed (see CSP)
    g = g || Function("return this")() || (1,eval)("this");
} catch(e) {
    // This works if the window reference is available
    if(typeof window === "object")
        g = window;
}

// g can still be undefined, but nothing to do about it...
// We return undefined, instead of nothing here, so it's
// easier to handle this case. if(!global) { ...}

module.exports = g;


/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

/* WEBPACK VAR INJECTION */(function(global) {function nowtime() {
  /* eslint-disable no-undef */
  if(typeof performance !== 'undefined' && performance.now) {
    return performance.now()
  }
  /* eslint-enable no-undef */
  return Date.now ? Date.now() : (new Date()).getTime()
}

if(typeof global.requestAnimationFrame === 'undefined') {
  global.requestAnimationFrame = function (callback) {
    return setTimeout(function () { // polyfill
      callback.call(this, nowtime())
    }, 1000 / 60)
  }
  global.cancelAnimationFrame = function (qId) {
    return clearTimeout(qId)
  }
}

const FrameManager = {
  steps: new Set(),
  add(step) {
    const steps = this.steps,
      timerId = this.timerId
    if(steps.has(step)) {
      return false
    }
    steps.add(step)
    const that = this
    if(timerId == null) {
      this.timerId = requestAnimationFrame(function step(t) {
        [...steps].forEach((step) => {
          if(step(t)) {
            steps.delete(step)
          }
        })
        if(steps.size) {
          requestAnimationFrame(step)
        } else {
          that.timerId = null
        }
      })
    }
  },
  remove(step) {
    const steps = this.steps
    if(steps.has(step)) {
      steps.delete(step)
    }
  },
  timerId: null,
}

class Animator {
  constructor(duration, update, easing) {
    this.duration = duration
    this.update = update
    this.easing = easing
  }
  animate(startTime) {
    startTime = startTime || 0

    const duration = this.duration,
      update = this.update,
      easing = this.easing,
      self = this

    return new Promise(((resolve, reject) => {
      function step(timestamp) {
        startTime = startTime || timestamp
        const p = Math.min(1.0, (timestamp - startTime) / duration)

        update.call(self, easing ? easing(p) : p, p)

        if(p < 1.0) {
          return false
        }

        resolve(startTime + duration)
        return true
      }

      FrameManager.add(step)

      self.cancel = function () {
        FrameManager.remove(step)
        update.call(self, 0, 0)
        resolve(startTime + duration)
      }
    }))
  }
  ease(easing) {
    return new Animator(this.duration, this.update, easing)
  }
}

module.exports = Animator

/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(0)))

/***/ })
/******/ ]);
});