From 681b6d5a08c604e0dab71d35a27983e34359af7b Mon Sep 17 00:00:00 2001
From: Soeren Apel <soeren@apelpie.net>
Date: Tue, 14 Feb 2017 00:12:54 +0100
Subject: [PATCH] AnalogSignal: Split up divs during autoranging if needed

---
 pv/view/analogsignal.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp
index d9ac2f60..2715a386 100644
--- a/pv/view/analogsignal.cpp
+++ b/pv/view/analogsignal.cpp
@@ -389,6 +389,12 @@ void AnalogSignal::perform_autoranging(bool force_update)
 		neg_vdivs_ = 0;
 	}
 
+	// Split up the divs if there are negative values but no negative divs
+	if ((min < 0) && (neg_vdivs_ == 0)) {
+		neg_vdivs_ = pos_vdivs_ / 2;
+		pos_vdivs_ -= neg_vdivs_;
+	}
+
 	double min_value_per_div;
 	if ((pos_vdivs_ > 0) && (neg_vdivs_ >  0))
 		min_value_per_div = std::max(max / pos_vdivs_, -min / neg_vdivs_);
-- 
2.30.2