1 files changed, 14 insertions, 0 deletions
diff --git a/crawl-ref/source/geom2d.cc b/crawl-ref/source/geom2d.cc
index 720f334226..3fba76e2d3 100644
--- a/crawl-ref/source/geom2d.cc
+++ b/crawl-ref/source/geom2d.cc
@@ -154,5 +154,19 @@ double form::operator()(const vector& v) const
     return (a*v.x + b*v.y);
 }
 
+double degrees(const vector &v)
+{
+    if (v.x == 0)
+        return (v.y > 0 ? 90.0 : -90.0);
+    double rad = v.x > 0 ? atan(v.y/v.x) : M_PI + atan(v.y/v.x);
+    return (180.0 / M_PI * rad);
+}
+
+vector degree_to_vector(double d)
+{
+    double rad = d / 180.0 * M_PI;
+    return (vector(cos(rad), sin(rad)));
+}
+
 }