number utils

number-utils.js

 /**
  * return random int in range
  */
 this.randInt = function (min, max) {
     return Math.floor(Math.random() * (max - min + 1)) + min;
 }


 /**
  * return random float in range
  */
 function randFloat (min, max) {
     return Math.random() * (max - min) + min;
 }

 /**
  * degrees to radians
  */
 function degToRad(deg) {
      return deg*(Math.PI/180);
 }

 /**
  * radians to degrees
  */
 function radToDeg(rad) {
      return rad/(Math.PI/180);
 }

 /**
  * returns the fraction behind the flaoting point of a float
  */
 function returnFloat(n) {
      return n - Math.floor(n);
 }

 /**
  * returns a value between 0 and 1 that represents the given value in the given range
  */
 function normalize(value, minimum, maximum) {
      return (value - minimum) / (maximum - minimum);
 }

 /**
  * returns the value in the given range for a representing normalized value
  * (it's normalize, but the other way around)
  */
 function interpolate (normValue, minimum, maximum) {
      return minimum + (maximum - minimum) * normValue;
 }    

 /**
  * returns the mapped value in range 2, given value 1 in range 1
  * (it's normalize, and than interpolate in a new range)
  */
 function map(value, min1, max1, min2, max2) {
      return interpolate( normalize(value, min1, max1), min2, max2);
 }