GridItem: Add custom line width based on pen option.

examples/GraphicsScene.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 ## Add path to library (just for examples; you do not need this)
+from PySide2.QtGui import QPen, QColor
+
 import initExample
 
 from pyqtgraph.Qt import QtCore, QtGui
@@ -56,6 +58,9 @@ prox.setPos(100,0)
 vb.addItem(prox)
 
 g = pg.GridItem()
+p = QPen(QColor(0, 255, 255))
+p.setWidthF(1)
+g.opts["pen"] = p
 vb.addItem(g)
 
 if __name__ == '__main__':

pyqtgraph/graphicsItems/GridItem.py

@@ -157,6 +157,7 @@ class GridItem(UIGraphicsItem):
 
                 linePen = self.opts['pen']
                 lineColor = self.opts['pen'].color()
+                lineWidth = self.opts['pen'].width()
                 lineColor.setAlpha(c)
                 linePen.setColor(lineColor)
 
@@ -170,9 +171,9 @@ class GridItem(UIGraphicsItem):
                 for x in range(0, int(nl[ax])):
                     linePen.setCosmetic(False)
                     if ax == 0:
-                        linePen.setWidthF(self.pixelWidth())
+                        linePen.setWidthF(lineWidth * self.pixelWidth())
                     else:
-                        linePen.setWidthF(self.pixelHeight())
+                        linePen.setWidthF(lineWidth * self.pixelHeight())
                     p.setPen(linePen)
                     p1 = np.array([0.,0.])
                     p2 = np.array([0.,0.])