From 9c24d87360a2f43a4de350c8b5226cd032779677 Mon Sep 17 00:00:00 2001
From: SoulMelody <SoulMelody@users.noreply.github.com>
Date: Sat, 25 Jan 2025 11:58:40 +0800
Subject: [PATCH] avoid ZeroDivisionError

---
 libresvip/utils/music_math.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libresvip/utils/music_math.py b/libresvip/utils/music_math.py
index ad7f52f1..5963dc1b 100644
--- a/libresvip/utils/music_math.py
+++ b/libresvip/utils/music_math.py
@@ -204,7 +204,7 @@ def f3(t: float, d: float) -> float:
 
     @staticmethod
     def slope(p1: tuple[float, float], p2: tuple[float, float]) -> float:
-        return (p2[1] - p1[1]) / (p2[0] - p1[0])
+        return (p2[1] - p1[1]) / (p2[0] - p1[0]) if p2[0] != p1[0] else math.nan
 
     def slope_at(self, point_index: int) -> float:
         if point_index in [0, len(self.points) - 1]: