From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Wed, 5 May 2021 03:45:22 +0000 (-0700)
Subject: replace hypotenuse calculation in computeoffset_qr with a call to hypot
X-Git-Tag: 2.47.2~16^2~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=53ec611641cc2497ed70dd168d466259ee3b8d3c;p=graphviz

replace hypotenuse calculation in computeoffset_qr with a call to hypot

The function hypot is available in C99 and has the potential to compute the same
operation more efficiently and with greater precision.
---

diff --git a/lib/common/emit.c b/lib/common/emit.c
index ae23ba533..0d799e449 100644
--- a/lib/common/emit.c
+++ b/lib/common/emit.c
@@ -17,6 +17,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <locale.h>
+#include <math.h>
 #include <common/render.h>
 #include <cgraph/agxbuf.h>
 #include <common/htmltable.h>
@@ -1996,7 +1997,7 @@ static pointf computeoffset_qr(pointf p, pointf q, pointf r, pointf s,
     double len;
     double x = q.x - r.x, y = q.y - r.y;
 
-    len = sqrt(x * x + y * y);
+    len = hypot(x, y);
     if (len < EPSILON) {
 	/* control points are on top of each other
 	   use slope between endpoints instead */