From d74c3a729ff85a6ba0170021bcdf9629bdea3e6e Mon Sep 17 00:00:00 2001
From: Mark Liversedge <liversedge@gmail.com>
Date: Wed, 16 Apr 2014 17:44:57 +0100
Subject: [PATCH] Fix going negative on setAlpha

.. to stop qt outputing error messages
---
 src/AllPlot.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AllPlot.cpp b/src/AllPlot.cpp
index 350de707a..4c7bad8cb 100644
--- a/src/AllPlot.cpp
+++ b/src/AllPlot.cpp
@@ -432,7 +432,7 @@ AllPlotObject::setColor(QColor color)
 
         // lighten up for the next guy
         color = color.darker(110);
-        alpha -= 10;
+        if (alpha > 10) alpha -= 10;
     }
 
     // has to be different...