common: Add toDegree

* Add toDegree function to convert Radians to Degrees
toji · Apr 14, 2024 · df064ad · df064ad
1 parent df5278f
commit df064ad
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diff --git a/spec/gl-matrix/common-spec.js b/spec/gl-matrix/common-spec.js
@@ -8,6 +8,11 @@ describe("common", function(){
     it("should return a value of 3.141592654(Math.PI)", function(){ expect(result).toBeEqualish(Math.PI); });
   });
 
+  describe("toDegree", function(){
+    beforeEach(function(){ result = glMatrix.toDegree(Math.PI); });
+    it("should return a value of 180", function(){ expect(result).toBeEqualish(180); });
+  });
+
   describe("equals", function() {
     let r0, r1, r2;
     beforeEach(function() {

diff --git a/src/common.js b/src/common.js
@@ -34,6 +34,8 @@ export function setMatrixArrayType(type) {
 
 const degree = Math.PI / 180;
 
+const radian = 180 / Math.PI;
+
 /**
  * Convert Degree To Radian
  *
@@ -43,6 +45,15 @@ export function toRadian(a) {
   return a * degree;
 }
 
+/**
+ * Convert Radian To Degree
+ *
+ * @param {Number} a Angle in Radians
+ */
+export function toDegree(a) {
+  return a * radian;
+}
+
 /**
  * Tests whether or not the arguments have approximately the same value, within an absolute
  * or relative tolerance of glMatrix.EPSILON (an absolute tolerance is used for values less