X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=pv%2Fviews%2Ftrace%2Fanalogsignal.cpp;h=6d4b2c67962a24bf4405f42e3c184d6dc60fce35;hb=2bdc5796c866b9494b2c40051e973e4385d9c46f;hp=60ba2ca9831b0cd94fc95ea85d93156d771ffe06;hpb=f0b992572e7e06a1f62ede8f1bf8d9b0ad8896bc;p=pulseview.git

diff --git a/pv/views/trace/analogsignal.cpp b/pv/views/trace/analogsignal.cpp
index 60ba2ca9..6d4b2c67 100644
--- a/pv/views/trace/analogsignal.cpp
+++ b/pv/views/trace/analogsignal.cpp
@@ -444,7 +444,9 @@ void AnalogSignal::paint_trace(QPainter &p,
 	}
 	delete[] sample_block;
 
-	p.drawPolyline(points, points_count);
+	// QPainter::drawPolyline() is slow, let's paint the lines ourselves
+	for (int64_t i = 1; i < points_count; i++)
+		p.drawLine(points[i - 1], points[i]);
 
 	if (show_sampling_points) {
 		if (paint_thr_dots) {
@@ -840,7 +842,7 @@ void AnalogSignal::perform_autoranging(bool keep_divs, bool force_update)
 	if (segments.empty())
 		return;
 
-	static double prev_min = 0, prev_max = 0;
+	double signal_min_ = 0, signal_max_ = 0;
 	double min = 0, max = 0;
 
 	for (const shared_ptr<pv::data::AnalogSegment>& segment : segments) {
@@ -849,11 +851,11 @@ void AnalogSignal::perform_autoranging(bool keep_divs, bool force_update)
 		max = std::max(max, mm.second);
 	}
 
-	if ((min == prev_min) && (max == prev_max) && !force_update)
+	if ((min == signal_min_) && (max == signal_max_) && !force_update)
 		return;
 
-	prev_min = min;
-	prev_max = max;
+	signal_min_ = min;
+	signal_max_ = max;
 
 	// If we're allowed to alter the div assignment...
 	if (!keep_divs) {