vec2.length

bpl · May 3, 2012 · 13f9d46 · 13f9d46
1 parent 3e38519
commit 13f9d46
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diff --git a/gl-matrix.js b/gl-matrix.js
@@ -2448,6 +2448,18 @@
       dest[2] = z;
       return dest;
     };
+
+    /**
+     * Caclulates the length of a vec2
+     *
+     * @param {vec2} vec vec2 to calculate length of
+     *
+     * @returns {Number} Length of vec
+     */
+    vec2.length = function (vec) {
+      var x = vec[0], y = vec[1];
+      return Math.sqrt(x * x + y * y);
+    };
 
     /*
      * Exports

diff --git a/spec/javascripts/vec2_spec.js b/spec/javascripts/vec2_spec.js
@@ -13,6 +13,10 @@ describe("vec2", function() {
     });
   });
 
+  describe("length", function() {
+    it("should return the correct value", function() { expect(vec2.length(vecA)).toBeEqualish(2.236067); });
+  });
+
   describe("cross", function() {
     describe("with dest given", function() {
       beforeEach(function() { result = vec2.cross(vecA, vecB, dest); });