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   1 package flare.animate.interpolate
   2 {
   3         /**
   4          * Interpolator for <code>Number</code> and <code>int</code> values.
   5          */
   6         public class NumberInterpolator extends Interpolator
   7         {
   8                 private var _start:Number;
   9                 private var _end:Number;
  10
  11                 /**
  12                  * Creates a new NumberInterpolator.
  13                  * @param target the object whose property is being interpolated
  14                  * @param property the property to interpolate
  15                  * @param start the starting number to interpolate from
  16                  * @param end the target number to interpolate to
  17                  */
  18                 public function NumberInterpolator(target:Object, property:String,
  19                                            start:Object, end:Object)
  20                 {
  21                         super(target, property, start, end);
  22                 }
  23
  24                 /**
  25                  * Initializes this interpolator.
  26                  * @param start the starting value of the interpolation
  27                  * @param end the target value of the interpolation
  28                  */
  29                 protected override function init(start:Object, end:Object) : void
  30                 {
  31                         _start = Number(start);
  32                         _end = Number(end);
  33                         if (isNaN(_start)) _start = _end;
  34                         _end = _end - _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                         _prop.setValue(_target, _start + f*_end);
  44                 }
  45
  46         } // end of class NumberInterpolator
  47 }