AP_WindVane: switch x and y in read_SITL_direction_ef

libraries/AP_WindVane/AP_WindVane.cpp

@@ -215,13 +215,13 @@ float AP_WindVane::read_SITL_direction_ef()
     // This is accounted for in these calculations
 
     // convert true wind speed and direction into a 2D vector
-    Vector2f wind_vector_ef(sinf(wind_dir_rad) * wind_speed, cosf(wind_dir_rad) * wind_speed);
+    Vector2f wind_vector_ef(cosf(wind_dir_rad) * wind_speed, sinf(wind_dir_rad) * wind_speed);
 
     // add vehicle speed to get apparent wind vector
-    wind_vector_ef.x += AP::sitl()->state.speedE;
-    wind_vector_ef.y += AP::sitl()->state.speedN;
+    wind_vector_ef.x += AP::sitl()->state.speedN;
+    wind_vector_ef.y += AP::sitl()->state.speedE;
 
-    return atan2f(wind_vector_ef.x, wind_vector_ef.y);
+    return atan2f(wind_vector_ef.y, wind_vector_ef.x);
 }
 #endif