X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fviews%2Ftrace%2Fanalogsignal.cpp;h=3430ab3cf48eb6996ca0cd52901c1d9c884aa4cb;hp=cd680085312b07d5249fecca2f51b0c32cdb39de;hb=8a07bc241694c10678968309bc8ee4e6076df3a3;hpb=3b2ead4fbeb899188564ec9c69c216708311a881

diff --git a/pv/views/trace/analogsignal.cpp b/pv/views/trace/analogsignal.cpp
index cd680085..3430ab3c 100644
--- a/pv/views/trace/analogsignal.cpp
+++ b/pv/views/trace/analogsignal.cpp
@@ -297,7 +297,7 @@ void AnalogSignal::paint_fore(QPainter &p, ViewItemPaintParams &pp)
 		// and we have corresponding data available
 		if (show_hover_marker_ && !std::isnan(value_at_hover_pos_)) {
 			infotext = QString("[%1] %2 V/div")
-				.arg(format_value_si(value_at_hover_pos_, SIPrefix::unspecified, 0, "V", false))
+				.arg(format_value_si(value_at_hover_pos_, SIPrefix::unspecified, 2, "V", false))
 				.arg(resolution_);
 		} else
 			infotext = QString("%1 V/div").arg(resolution_);
@@ -319,6 +319,7 @@ void AnalogSignal::paint_fore(QPainter &p, ViewItemPaintParams &pp)
 
 void AnalogSignal::paint_grid(QPainter &p, int y, int left, int right)
 {
+	bool was_antialiased = p.testRenderHint(QPainter::Antialiasing);
 	p.setRenderHint(QPainter::Antialiasing, false);
 
 	if (pos_vdivs_ > 0) {
@@ -363,7 +364,7 @@ void AnalogSignal::paint_grid(QPainter &p, int y, int left, int right)
 		}
 	}
 
-	p.setRenderHint(QPainter::Antialiasing, true);
+	p.setRenderHint(QPainter::Antialiasing, was_antialiased);
 }
 
 void AnalogSignal::paint_trace(QPainter &p,
@@ -443,7 +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) {