1 files changed, 8 insertions, 0 deletions
diff --git a/frontend/_shared/math/vec2.js b/frontend/_shared/math/vec2.js
index cff38ce..11e71cd 100644
--- a/frontend/_shared/math/vec2.js
+++ b/frontend/_shared/math/vec2.js
@@ -53,4 +53,12 @@ function negate2(v) {
         x: -v.x,
         y: -v.y
     };
+}
+
+// Algorithm plucked from: https://matthew-brett.github.io/teaching/rotation_2d.html
+function rotateAboutOrigin2(v, angle) {
+    return {
+        x: v.x * Math.cos(angle) - v.y * Math.sin(angle),
+        y: v.x * Math.sin(angle) + v.y * Math.cos(angle),
+    };
 }
 \ No newline at end of file