From 21c2135588a6a76b6dcc4defc6e64a3d9032db59 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 26 Jul 2015 10:50:36 +0200
Subject: qfc: interpolate the right way for negative values

---
 qfunctionconfigurator/functionconfig.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qfunctionconfigurator/functionconfig.cpp b/qfunctionconfigurator/functionconfig.cpp
index 38a9e703..825aa3c1 100644
--- a/qfunctionconfigurator/functionconfig.cpp
+++ b/qfunctionconfigurator/functionconfig.cpp
@@ -28,7 +28,7 @@ Map::num Map::getValue(Map::num x) {
     num q  = x * precision();
     int xi = (int)q;
     num yi = getValueInternal(xi);
-    num yiplus1 = getValueInternal(xi+1);
+    num yiplus1 = getValueInternal(xi + (x < 0 ? -1 : 1));
     num f = (q-xi);
     num ret = yiplus1 * f + yi * (1.0f - f); // at least do a linear interpolation.
     last_input_value.setX(x);
-- 
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