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Return a % that a number is between 2 other numbers

/ Published in: ActionScript 3
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  1. /**
  2. 		 * Returns a percentage of a value in between 2 other numbers.
  3. 		 * @param bottomRange  low end of the range.
  4. 		 * @param  topRange  top end of the range.
  5. 		 * @param  valueInRange value to find a range percentage of.
  6. 		 * @return The percentage of valueInRange in the range.
  7. 		 *  @use getPercentWithinRange( 50, 150, 100 );  // displays 50
  8. 		 */
  9. 		public static function getPercentWithinRange( bottomRange:Number, topRange:Number, valueInRange:Number ):Number
  10. 		{
  11. 			// normalize values to work off zero
  12. 			if (bottomRange < 0)
  13. 			{
  14. 				var addToAll:Number = Math.abs(bottomRange);
  15. 				bottomRange +=  addToAll;
  16. 				topRange +=  addToAll;
  17. 				valueInRange +=  addToAll;
  18. 			}
  19. 			else if ( bottomRange > 0 )
  20. 			{
  21. 				var subFromAll:Number = Math.abs(bottomRange);
  22. 				bottomRange -=  subFromAll;
  23. 				topRange -=  subFromAll;
  24. 				valueInRange -=  subFromAll;
  25. 			}
  26. 			// simple calc to get percentage 
  27. 			return 100 * ( valueInRange / ( topRange - bottomRange ) );
  28. 		}

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