From b66e6e8ad68717f186071153aefc6ae012170c01 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <luke.campagnola@gmail.com>
Date: Mon, 7 Jan 2013 10:45:17 -0500
Subject: [PATCH] Speed up PlotCurveItem in some cases (avoid drawing shadow
 when it is not needed)

---
 pyqtgraph/graphicsItems/PlotCurveItem.py |  8 +++++---
 pyqtgraph/graphicsItems/PlotDataItem.py  | 11 +----------
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/pyqtgraph/graphicsItems/PlotCurveItem.py b/pyqtgraph/graphicsItems/PlotCurveItem.py
index 5314b0f2..8af13e19 100644
--- a/pyqtgraph/graphicsItems/PlotCurveItem.py
+++ b/pyqtgraph/graphicsItems/PlotCurveItem.py
@@ -426,10 +426,12 @@ class PlotCurveItem(GraphicsObject):
             p.fillPath(self.fillPath, self.opts['brush'])
             prof.mark('draw fill path')
             
-
+        sp = fn.mkPen(self.opts['shadowPen'])
+        cp = fn.mkPen(self.opts['pen'])
+ 
         ## Copy pens and apply alpha adjustment
-        sp = QtGui.QPen(self.opts['shadowPen'])
-        cp = QtGui.QPen(self.opts['pen'])
+        #sp = QtGui.QPen(self.opts['shadowPen'])
+        #cp = QtGui.QPen(self.opts['pen'])
         #for pen in [sp, cp]:
             #if pen is None:
                 #continue
diff --git a/pyqtgraph/graphicsItems/PlotDataItem.py b/pyqtgraph/graphicsItems/PlotDataItem.py
index 714210c4..22aa3ad9 100644
--- a/pyqtgraph/graphicsItems/PlotDataItem.py
+++ b/pyqtgraph/graphicsItems/PlotDataItem.py
@@ -379,10 +379,7 @@ class PlotDataItem(GraphicsObject):
 
 
     def updateItems(self):
-        #for c in self.curves+self.scatters:
-            #if c.scene() is not None:
-                #c.scene().removeItem(c)
-            
+        
         curveArgs = {}
         for k,v in [('pen','pen'), ('shadowPen','shadowPen'), ('fillLevel','fillLevel'), ('fillBrush', 'brush'), ('antialias', 'antialias')]:
             curveArgs[v] = self.opts[k]
@@ -399,18 +396,12 @@ class PlotDataItem(GraphicsObject):
             self.curve.show()
         else:
             self.curve.hide()
-            #curve = PlotCurveItem(x=x, y=y, **curveArgs)
-            #curve.setParentItem(self)
-            #self.curves.append(curve)
         
         if scatterArgs['symbol'] is not None:
             self.scatter.setData(x=x, y=y, **scatterArgs)
             self.scatter.show()
         else:
             self.scatter.hide()
-            #sp = ScatterPlotItem(x=x, y=y, **scatterArgs)
-            #sp.setParentItem(self)
-            #self.scatters.append(sp)
 
 
     def getData(self):