1 files changed, 10 insertions, 1 deletions
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
index b7354db..ae56e87 100644
--- a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
+++ b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
@@ -124,7 +124,16 @@ inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, fl
 {
     float dx = x2 - x1;
     float dy = y2 - y1;
-    float pw = m_width / sqrt(dx*dx + dy*dy);
+
+    float pw;
+
+    if (dx == 0)
+        pw = m_width / dy;
+    else if (dy == 0)
+        pw = m_width / dx;
+    else
+        pw = m_width / sqrt(dx*dx + dy*dy);
+
     *nx = -dy * pw;
     *ny = dx * pw;
 }