Enhancement: [Issue/812]: just pass plotArgs keyword arguments

examples/MultiPlotWidget.py

@@ -30,7 +30,7 @@ ma = MetaArray(data, info=[
         ]}, 
     {'name': 'Time', 'values': linspace(0., 1., 1000), 'units': 's'}
     ])
-pw.plot(ma)
+pw.plot(ma, pen='y')
 
 ## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':

pyqtgraph/graphicsItems/MultiPlotItem.py

@@ -20,18 +20,8 @@ class MultiPlotItem(GraphicsLayout.GraphicsLayout):
         self.plots = []
 
 
-    def plot(self, data, **kwargs):
+    def plot(self, data, **plotArgs):
         #self.layout.clear()
-        # extra plot parameters
-        extraParams = {}
-
-        # if 'pen' provided, add it as an extra param
-        if 'pen' in kwargs:
-            pen = kwargs['pen']
-            if not isinstance(pen, QtGui.QPen):
-                raise TypeError("Keyword argument 'pen' must be an instance of QtGui.QPen")
-            extraParams['pen'] = pen
-
 
         if hasattr(data, 'implements') and data.implements('MetaArray'):
             if data.ndim != 2:
@@ -48,7 +38,7 @@ class MultiPlotItem(GraphicsLayout.GraphicsLayout):
                 self.nextRow()
                 sl = [slice(None)] * 2
                 sl[ax] = i
-                pi.plot(data[tuple(sl)], **extraParams)
+                pi.plot(data[tuple(sl)], **plotArgs)
                 #self.layout.addItem(pi, i, 0)
                 self.plots.append((pi, i, 0))
                 info = ic[ax]['cols'][i]