From 74e1cea0b92c80e5710e7ca0b55566f226eb443d Mon Sep 17 00:00:00 2001
From: Guillermo Gombau <guillermo.gombau@psycle.com>
Date: Thu, 20 Sep 2018 14:13:24 +0200
Subject: [PATCH] Add vec2#rotate

---
 types/gl-matrix/gl-matrix-tests.ts |  1 +
 types/gl-matrix/index.d.ts         | 21 ++++++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/types/gl-matrix/gl-matrix-tests.ts b/types/gl-matrix/gl-matrix-tests.ts
index cf9c4ef616..e557acf79d 100644
--- a/types/gl-matrix/gl-matrix-tests.ts
+++ b/types/gl-matrix/gl-matrix-tests.ts
@@ -74,6 +74,7 @@ outVec2 = vec2.cross(outVec3, vec2A, vec2B);
 outVec2 = vec2.lerp(outVec2, vec2A, vec2B, 0.5);
 outVec2 = vec2.random(outVec2);
 outVec2 = vec2.random(outVec2, 5.0);
+outVec2 = vec2.rotate(outVec2, vec2A, vec2B, Math.PI * 0.5);
 outVec2 = vec2.transformMat2(outVec2, vec2A, mat2A);
 outVec2 = vec2.transformMat2d(outVec2, vec2A, mat2dA);
 outVec2 = vec2.transformMat3(outVec2, vec2A, mat3A);
diff --git a/types/gl-matrix/index.d.ts b/types/gl-matrix/index.d.ts
index 2c86b6a057..33db200cd6 100644
--- a/types/gl-matrix/index.d.ts
+++ b/types/gl-matrix/index.d.ts
@@ -374,6 +374,17 @@ declare module 'gl-matrix' {
          */
         public static random(out: vec2, scale: number): vec2;
 
+        /**
+         * Rotate a 2D vector
+         *
+         * @param out The receiving vec2
+         * @param a The vec2 point to rotate
+         * @param b The origin of the rotation
+         * @param c The angle of rotation
+         * @returns out
+         */
+        public static rotate(out: vec2, a: vec2, b: vec2, c: number): vec2;
+
         /**
          * Transforms the vec2 with a mat2
          *
@@ -1959,13 +1970,13 @@ declare module 'gl-matrix' {
          * @returns out
          */
         public static transpose(out: mat3, a: mat3): mat3;
-        
+
          /**
          * Generates a 2D projection matrix with the given bounds
          *
          * @param out the receiving matrix
          * @param width width of your gl context
-         * @param height height of gl context 
+         * @param height height of gl context
          * @returns out
          */
         public static projection(out: mat3, width: number, height: number): mat3;
@@ -2510,9 +2521,9 @@ declare module 'gl-matrix' {
         public static getTranslation(out: vec3, mat: mat4): vec3;
 
         /**
-         * Returns the scaling factor component of a transformation matrix. 
-         * If a matrix is built with fromRotationTranslationScale with a 
-         * normalized Quaternion parameter, the returned vector will be 
+         * Returns the scaling factor component of a transformation matrix.
+         * If a matrix is built with fromRotationTranslationScale with a
+         * normalized Quaternion parameter, the returned vector will be
          * the same as the scaling vector originally supplied.
          * @param {vec3} out Vector to receive scaling factor component
          * @param {mat4} mat Matrix to be decomposed (input)