From 1f983e59a1c688cff724f84ee084c48ba38c8007 Mon Sep 17 00:00:00 2001
From: John Tapsell <johnflux@gmail.com>
Date: Mon, 7 Oct 2013 21:25:18 +0100
Subject: [PATCH] Do not crash in an empty symmetric IncrementalPlot

This crash could be reproduced by starting QGroundControl, switching to
plot, then clicking the "Symmetric" checkbox.
---
 src/ui/linechart/IncrementalPlot.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ui/linechart/IncrementalPlot.cc b/src/ui/linechart/IncrementalPlot.cc
index 4b90fcf9f..d227105c4 100644
--- a/src/ui/linechart/IncrementalPlot.cc
+++ b/src/ui/linechart/IncrementalPlot.cc
@@ -214,6 +214,9 @@ void IncrementalPlot::resetScaling()
 void IncrementalPlot::updateScale()
 {
     const double margin = 0.05;
+    if(xmin == DBL_MAX)
+        return;
+
     double xMinRange = xmin-(qAbs(xmin*margin));
     double xMaxRange = xmax+(qAbs(xmax*margin));
     double yMinRange = ymin-(qAbs(ymin*margin));
-- 
2.22.0