2 files changed, 13 insertions, 0 deletions
diff --git a/frontend/shared_cpp/WebglHelper.h b/frontend/shared_cpp/WebglHelper.h
new file mode 100644
index 0000000..dbdb23f
--- /dev/null
+++ b/frontend/shared_cpp/WebglHelper.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "mathlib.h"
+
+struct OrthographicRenderer;
+
+void render2DArrow(Vector2 start, Vector2 end, OrthographicRenderer* renderer);
diff --git a/frontend/shared_cpp/mathlib.h b/frontend/shared_cpp/mathlib.h
index 383c880..b9f3fee 100644
--- a/frontend/shared_cpp/mathlib.h
+++ b/frontend/shared_cpp/mathlib.h
@@ -57,6 +57,13 @@ struct Vector2 {
         return { -y, x };
     }
 
+    Vector2 rotate(float angle) {
+        return {
+            x * cosf(angle) - y * sinf(angle),
+            x * sinf(angle) + y * cosf(angle)
+        };
+    }
+
     void printDebug(const char* name) {
         printf("%s=Vector2(%f, %f)\n", name, x, y);
     }