Implement a few math utilities

src/util/math-util.js

@@ -0,0 +1,20 @@
+function MathUtil () {}
+
+MathUtil.degToRad = function (deg) {
+    return (Math.PI * (90 - deg)) / 180;
+};
+
+MathUtil.radToDeg = function (rad) {
+    return rad * 180 / Math.PI;
+};
+
+MathUtil.clamp = function (n, min, max) {
+    return Math.min(Math.max(n, min), max);
+};
+
+MathUtil.wrapClamp = function (n, min, max) {
+    var range = (max - min) + 1;
+    return n - Math.floor((n - min) / range) * range;
+};
+
+module.exports = MathUtil;