git.mjollnir.org Git - moodle.git/blob

   1 package flare.animate.interpolate
   2 {
   3         /**
   4          * Interpolator for <code>Date</code> values.
   5          */
   6         public class DateInterpolator extends Interpolator
   7         {
   8                 private var _start:Number;
   9                 private var _end:Number;
  10                 private var _d:Date;
  11
  12                 /**
  13                  * Creates a new DateInterpolator.
  14                  * @param target the object whose property is being interpolated
  15                  * @param property the property to interpolate
  16                  * @param start the starting date value to interpolate from
  17                  * @param end the target date value to interpolate to
  18                  */
  19                 public function DateInterpolator(target:Object, property:String,
  20                                                  start:Object, end:Object)
  21                 {
  22                         super(target, property, start, end);
  23                 }
  24
  25                 /**
  26                  * Initializes this interpolator.
  27                  * @param start the starting value of the interpolation
  28                  * @param end the target value of the interpolation
  29                  */
  30                 protected override function init(start:Object, end:Object) : void
  31                 {
  32                         _d = new Date();
  33                         _start = (start as Date).time;
  34                         _end = (end as Date).time - _start;
  35                 }
  36
  37                 /**
  38                  * Calculate and set an interpolated property value.
  39                  * @param f the interpolation fraction (typically between 0 and 1)
  40                  */
  41                 public override function interpolate(f:Number) : void
  42                 {
  43                         _d.time = _start + f * _end;
  44                         _prop.setValue(_target, _d);
  45                 }
  46
  47         } // end of class DateInterpolator
  48 }