From 0429c8353a8195c0a0fd482162346ca9ba55c4eb Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Tue, 1 Mar 2022 09:23:51 +0100
Subject: [PATCH] fixed a crash when drawing aura in some projections

---
 graph.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/graph.cpp b/graph.cpp
index 95c92e6d..c10aea49 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -3058,7 +3058,7 @@ EX void addaura(shiftpoint h, color_t col, int fd) {
   if(!haveaura_cached) return;
   apply_joukowsky_aura(h);
 
-  int r = int(2*AURA + atan2(h[1], h[0]) * AURA / 2 / M_PI) % AURA; 
+  int r = gmod(atan2(h[1], h[0]) * AURA / 2 / M_PI, AURA);
   aurac[r][3] += auramemo << fd;
   col = darkened(col);
   aurac[r][0] += (col>>16)&255;