From 44e5e4c76564d127cd2e3ae6dae9c1a2c6d219f3 Mon Sep 17 00:00:00 2001
From: Harald Oehlmann <harald.oehlmann@elmicron.de>
Date: Mon, 29 Mar 2021 13:19:14 +0200
Subject: [PATCH] Fix for ticket #179 "division by 0" proposed by SergeySlice

---
 src/nanosvg.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/nanosvg.h b/src/nanosvg.h
index 4c03ee5..3511664 100644
--- a/src/nanosvg.h
+++ b/src/nanosvg.h
@@ -2187,7 +2187,12 @@ static void nsvg__pathArcTo(NSVGparser* p, float* cpx, float* cpy, float* args,
 	// The loop assumes an iteration per end point (including start and end), this +1.
 	ndivs = (int)(fabsf(da) / (NSVG_PI*0.5f) + 1.0f);
 	hda = (da / (float)ndivs) / 2.0f;
-	kappa = fabsf(4.0f / 3.0f * (1.0f - cosf(hda)) / sinf(hda));
+	// Fix for ticket #179: division by 0: avoid cotangens around 0 (infinite)
+	if ((hda < 1e-3f) && (hda > -1e-3f))
+		hda *= 0.5f;
+	else
+		hda = (1.0f - cosf(hda)) / sinf(hda);
+	kappa = fabsf(4.0f / 3.0f * hda);
 	if (da < 0.0f)
 		kappa = -kappa;