From eb1b7fc8bb07669bc0140678f09c1b934a507bbb Mon Sep 17 00:00:00 2001
From: Luke Campagnola <ausqualius@yahoo.com>
Date: Fri, 29 Sep 2017 08:56:44 -0700
Subject: [PATCH] add systemsolver copy method

---
 pyqtgraph/parametertree/SystemSolver.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pyqtgraph/parametertree/SystemSolver.py b/pyqtgraph/parametertree/SystemSolver.py
index c804d50a..ffdabfae 100644
--- a/pyqtgraph/parametertree/SystemSolver.py
+++ b/pyqtgraph/parametertree/SystemSolver.py
@@ -1,5 +1,7 @@
 from ..pgcollections import OrderedDict
 import numpy as np
+import copy
+
 
 class SystemSolver(object):
     """
@@ -73,6 +75,12 @@ class SystemSolver(object):
         self.__dict__['_currentGets'] = set()
         self.reset()
         
+    def copy(self):
+        sys = type(self)()
+        sys.__dict__['_vars'] = copy.deepcopy(self.__dict__['_vars'])
+        sys.__dict__['_currentGets'] = copy.deepcopy(self.__dict__['_currentGets'])
+        return sys
+
     def reset(self):
         """
         Reset all variables in the solver to their default state.