From 2a06dc997f965211169c7365071d8ef4cbf2542d Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Wed, 7 Sep 2022 16:12:57 -0400
Subject: [PATCH] Use pixel caching on our level lines

---
 piker/ui/_lines.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/piker/ui/_lines.py b/piker/ui/_lines.py
index 697e889f..1e20958c 100644
--- a/piker/ui/_lines.py
+++ b/piker/ui/_lines.py
@@ -122,6 +122,9 @@ class LevelLine(pg.InfiniteLine):
         self._y_incr_mult = 1 / chart.linked.symbol.tick_size
         self._right_end_sc: float = 0
 
+        # use px caching
+        self.setCacheMode(QtWidgets.QGraphicsItem.DeviceCoordinateCache)
+
     def txt_offsets(self) -> tuple[int, int]:
         return 0, 0