From 61223fb0536d4f2a29fe229e6c1666c2db83c35c Mon Sep 17 00:00:00 2001
From: Robert Jordens <rj@m-labs.hk>
Date: Thu, 17 Mar 2016 00:30:13 +0100
Subject: [PATCH] scanwidget: min 3 ticks (f3b4cb2)

---
 artiq/gui/scanwidget.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/artiq/gui/scanwidget.py b/artiq/gui/scanwidget.py
index 57141a1f2..1d9983245 100644
--- a/artiq/gui/scanwidget.py
+++ b/artiq/gui/scanwidget.py
@@ -173,8 +173,8 @@ class ScanWidget(QtWidgets.QWidget):
         if center:
             scale = min(scale, self.dynamicRange/abs(center))
         left = a*scale/b
-        self.ticker.min_ticks = int(ev.size().width() /
-                                    (2.5*self._labelSize.width()))
+        self.ticker.min_ticks = max(
+            3, int(ev.size().width()/(2.5*self._labelSize.width())))
         self._setView(left, scale)
 
     def paintEvent(self, ev):