From: Ryan Govostes <redacted>
Date: Mon, 25 Mar 2019 16:50:25 +0000 (+0100)
Subject: Use multiple drawLine() calls instead of drawPolyline()
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=8a07bc241694c10678968309bc8ee4e6076df3a3;p=pulseview.git

Use multiple drawLine() calls instead of drawPolyline()
---

diff --git a/pv/views/trace/analogsignal.cpp b/pv/views/trace/analogsignal.cpp
index 60ba2ca9..3430ab3c 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) {