X-Git-Url: http://git.code-monkey.de/?a=blobdiff_plain;f=pv%2Fview%2Fanalogsignal.cpp;h=c393bc7cdc00adc9a5b0062530e53cfba1a98a02;hb=76ce6c7ae29059774c36bee27f6e09bfec94b358;hp=d9ac2f60afcf853d1b225a18c139854ec94ed824;hpb=85715407f784767052238586f4e7f64440b7693e;p=pulseview.git

diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp
index d9ac2f6..c393bc7 100644
--- a/pv/view/analogsignal.cpp
+++ b/pv/view/analogsignal.cpp
@@ -80,7 +80,7 @@ AnalogSignal::AnalogSignal(
 	pos_vdivs_(1),
 	neg_vdivs_(1),
 	resolution_(0),
-	autoranging_(1)
+	autoranging_(true)
 {
 	pv::data::Analog* analog_data =
 		dynamic_cast<pv::data::Analog*>(data().get());
@@ -277,7 +277,9 @@ void AnalogSignal::paint_trace(QPainter &p,
 {
 	p.setPen(base_->colour());
 
-	QPointF *points = new QPointF[end - start];
+	const int64_t points_count = end - start;
+
+	QPointF *points = new QPointF[points_count];
 	QPointF *point = points;
 
 	pv::data::SegmentAnalogDataIterator* it =
@@ -292,7 +294,7 @@ void AnalogSignal::paint_trace(QPainter &p,
 	}
 	segment->end_sample_iteration(it);
 
-	p.drawPolyline(points, point - points);
+	p.drawPolyline(points, points_count);
 
 	delete[] points;
 }
@@ -389,6 +391,12 @@ 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_);