From 2848d451f67695ab34e7b2832f24c1e948784cc7 Mon Sep 17 00:00:00 2001
From: Karl Georg Bedrich <karl@bedrich.de>
Date: Tue, 9 Jun 2020 08:33:12 +0200
Subject: [PATCH] draw connector lines between gradient and region with
 anti-aliasing (#496)

Co-authored-by: serkgb <serkgb@J873GY1-2.stf.nus.edu.sg>
Co-authored-by: Ogi Moore <ognyan.moore@gmail.com>
---
 pyqtgraph/graphicsItems/HistogramLUTItem.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pyqtgraph/graphicsItems/HistogramLUTItem.py b/pyqtgraph/graphicsItems/HistogramLUTItem.py
index ad39b60e..38f1e5b4 100644
--- a/pyqtgraph/graphicsItems/HistogramLUTItem.py
+++ b/pyqtgraph/graphicsItems/HistogramLUTItem.py
@@ -142,6 +142,7 @@ class HistogramLUTItem(GraphicsWidget):
         p1 = self.vb.mapFromViewToItem(self, Point(self.vb.viewRect().center().x(), rgn[0]))
         p2 = self.vb.mapFromViewToItem(self, Point(self.vb.viewRect().center().x(), rgn[1]))
         gradRect = self.gradient.mapRectToParent(self.gradient.gradRect.rect())
+        p.setRenderHint(QtGui.QPainter.Antialiasing)
         for pen in [fn.mkPen((0, 0, 0, 100), width=3), pen]:
             p.setPen(pen)
             p.drawLine(p1 + Point(0, 5), gradRect.bottomLeft())