Add ol.math.roundUpToPowerOfTwo

2013-03-19 21:11:44 +01:00
parent 6c32170a08
commit 57abbddf50
2 changed files with 50 additions and 0 deletions
--- a/src/ol/math.js
+++ b/src/ol/math.js
@@ -29,6 +29,16 @@ ol.math.csch = function(x) {
 };


+/**
+ * @param {number} x X.
+ * @return {number} The smallest power of two greater than or equal to x.
+ */
+ol.math.roundUpToPowerOfTwo = function(x) {
+  goog.asserts.assert(0 < x);
+  return Math.pow(2, Math.ceil(Math.log(x) / Math.log(2)));
+};
+
+
 /**
 * @param {number} x X.
 * @return {number} Hyperbolic secant of x.