extjs/packages/core/src/fx/easing/EaseIn.js

   1 /**
   2  * @private
   3  */
   4 Ext.define('Ext.fx.easing.EaseIn', {
   5     extend: 'Ext.fx.easing.Linear',
   6
   7     alias: 'easing.ease-in',
   8
   9     config: {
  10         exponent: 4,
  11         duration: 1500
  12     },
  13
  14     getValue: function() {
  15         var deltaTime = Ext.Date.now() - this.getStartTime(),
  16             duration = this.getDuration(),
  17             startValue = this.getStartValue(),
  18             endValue = this.getEndValue(),
  19             distance = this.distance,
  20             theta = deltaTime / duration,
  21             thetaEnd = Math.pow(theta, this.getExponent()),
  22             currentValue = startValue + (thetaEnd * distance);
  23
  24         if (deltaTime >= duration) {
  25             this.isEnded = true;
  26             return endValue;
  27         }
  28
  29         return currentValue;
  30     }
  31 });