From: buliabyak <buliabyak@users.sourceforge.net>
Date: Sat, 29 Aug 2009 03:00:10 +0000 (+0000)
Subject: patch by Alvin for 418798
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=0a148d5e34b0d9ebac29a68a9ec02d6d43d0eb8c;p=inkscape.git

patch by Alvin for 418798
---

diff --git a/src/live_effects/spiro.cpp b/src/live_effects/spiro.cpp
index 4aad25f08..abc9c94ca 100644
--- a/src/live_effects/spiro.cpp
+++ b/src/live_effects/spiro.cpp
@@ -731,8 +731,10 @@ spiro_iter(spiro_seg *s, bandmat *m, int *perm, double *v, int n)
 	add_mat_line(m, v, derivs[1][1], -ends[1][1], 1, j, jk0r, jinc, nmat);
 	add_mat_line(m, v, derivs[2][1], -ends[1][2], 1, j, jk1r, jinc, nmat);
 	add_mat_line(m, v, derivs[3][1], -ends[1][3], 1, j, jk2r, jinc, nmat);
-	v[jthl] = mod_2pi(v[jthl]);
-	v[jthr] = mod_2pi(v[jthr]);
+	if (jthl >= 0)
+		v[jthl] = mod_2pi(v[jthl]);
+	if (jthr >= 0)
+		v[jthr] = mod_2pi(v[jthr]);
 	j += jinc;
     }
     if (cyclic) {