Merge pull request #5682 from KevinGrajeda/anglemode

Fixes #5160

Author: limzykenneth

src/math/trigonometry.js

@@ -281,9 +281,9 @@ p5.prototype.radians = angle => angle * constants.DEG_TO_RAD;
 /**
  * Sets the current mode of p5 to the given mode. Default mode is RADIANS.
  *
+ * Calling <a href="#/p5/angleMode">angleMode()</a> with no arguments returns current anglemode.
  * @method angleMode
  * @param {Constant} mode either RADIANS or DEGREES
- *
  * @example
  * <div>
  * <code>
@@ -306,8 +306,15 @@ p5.prototype.radians = angle => angle * constants.DEG_TO_RAD;
  * </div>
  *
  */
+/**
+ * @method angleMode
+ * @return {Constant} mode either RADIANS or DEGREES
+ */
 p5.prototype.angleMode = function(mode) {
-  if (mode === constants.DEGREES || mode === constants.RADIANS) {
+  p5._validateParameters('angleMode', arguments);
+  if (typeof mode === 'undefined') {
+    return this._angleMode;
+  } else if (mode === constants.DEGREES || mode === constants.RADIANS) {
     this._angleMode = mode;
   }
 };

test/unit/math/trigonometry.js

@@ -48,17 +48,33 @@ suite('Trigonometry', function() {
   suite('p5.prototype.angleMode', function() {
     test('should set constant to DEGREES', function() {
       myp5.angleMode(DEGREES);
-      assert.equal(myp5._angleMode, 'degrees');
+      assert.equal(myp5.angleMode(), 'degrees');
     });
 
     test('should set constant to RADIANS', function() {
       myp5.angleMode(RADIANS);
-      assert.equal(myp5._angleMode, 'radians');
+      assert.equal(myp5.angleMode(), 'radians');
+    });
+
+    test('wrong param type', function() {
+      assert.validationError(function() {
+        myp5.angleMode('wtflolzkk');
+      });
+    });
+
+    test('should return radians', function() {
+      myp5.angleMode(RADIANS);
+      assert.equal(myp5.angleMode(), 'radians');
+    });
+
+    test('should return degrees', function() {
+      myp5.angleMode(DEGREES);
+      assert.equal(myp5.angleMode(), 'degrees');
     });
 
     test('should always be RADIANS or DEGREES', function() {
       myp5.angleMode('wtflolzkk');
-      assert.equal(myp5._angleMode, 'radians');
+      assert.equal(myp5.angleMode(), 'radians');
     });
   });