Filling correction for Fillbetweenitem

pyqtgraph/examples/FillBetweenItem.py

@@ -20,7 +20,8 @@
 mn = mx = np.zeros(len(x))
 curves = [win.plot(x=x, y=np.zeros(len(x)), pen='k') for i in range(4)]
 brushes = [0.5, (100, 100, 255), 0.5]
-fills = [pg.FillBetweenItem(curves[i], curves[i+1], brushes[i]) for i in range(3)]
+fills = [pg.FillBetweenItem(curves[0], curves[3], brushes[0]),
+         pg.FillBetweenItem(curves[1], curves[2], brushes[1])]
 for f in fills:
     win.addItem(f)
 

pyqtgraph/graphicsItems/FillBetweenItem.py

@@ -23,7 +23,7 @@ def __init__(self, curve1=None, curve2=None, brush=None, pen=None):
         self.updatePath()
 
     def setBrush(self, *args, **kwds):
-        """Change the fill brush. Acceps the same arguments as pg.mkBrush()"""
+        """Change the fill brush. Accepts the same arguments as pg.mkBrush()"""
         QtWidgets.QGraphicsPathItem.setBrush(self, fn.mkBrush(*args, **kwds))
 
     def setPen(self, *args, **kwds):
@@ -55,7 +55,6 @@ def setCurves(self, curve1, curve2):
 
     def curveChanged(self):
         self.updatePath()
-
     def updatePath(self):
         if self.curves is None:
             self.setPath(QtGui.QPainterPath())
@@ -69,14 +68,19 @@ def updatePath(self):
 
         path = QtGui.QPainterPath()
         transform = QtGui.QTransform()
+
         ps1 = paths[0].toSubpathPolygons(transform)
         ps2 = paths[1].toReversed().toSubpathPolygons(transform)
         ps2.reverse()
+
         if len(ps1) == 0 or len(ps2) == 0:
             self.setPath(QtGui.QPainterPath())
             return
 
-
         for p1, p2 in zip(ps1, ps2):
-            path.addPolygon(p1 + p2)
+            intersection = p1.intersected(p2)
+            if not intersection.isEmpty():
+                for i in range(intersection.size()):
+                    path.lineTo(intersection.at(i))
+            path.addPolygon(p1 + p2)       
         self.setPath(path)