PyQtGraph grid with linked axes

Question

Having a simple graphics layout with PyQtGraph in which the x-axis of the plots are linked together and the grid is displayed in both plots as well:

from pyqtgraph.Qt import QtGui, QtCore                                              
import pyqtgraph as pg                                                              

app = QtGui.QApplication([])                                                        
view = pg.GraphicsView()                                                            
l = pg.GraphicsLayout()                                                             
view.setCentralItem(l)                                                              
view.show()                                                                         
view.resize(800,600)                                                                

p0 = l.addPlot(0, 0)                                                                
p0.showGrid(x = True, y = True, alpha = 0.3)                                        
#p0.hideAxis('bottom')                                                              
p1 = l.addPlot(1, 0)                                                                
p1.showGrid(x = True, y = True, alpha = 0.3)                                        

p1.setXLink(p0)                                                                     

l.layout.setSpacing(0.)                                                             
l.setContentsMargins(0., 0., 0., 0.)                                                

if __name__ == '__main__':                                                          
    import sys                                                                      
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):         
        QtGui.QApplication.instance().exec_()  

If I hide the x-axis in the first plot (uncommenting the p0.hideAxis('bottom') line in the code) then the axis will be gone, but the grid will disappear too:

How could I force it to stay there? As both x-axis are linked together, I would expect that to be possible (the grid in the upper plot could be taken from the lower plot's x-axis).

Answer 1

Instead of hiding the axis, try axis.setStyle(showValues=False) .

(This might only be available in the development branch)

Answer 2

So, this is complete code with the amendments:

#https://stackoverflow.com/questions/27100277/pyqtgraph-grid-with-linked-axes
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg

app = QtGui.QApplication([])
view = pg.GraphicsView()
l = pg.GraphicsLayout()
view.setCentralItem(l)
view.show()
view.resize(800,600)

p0 = l.addPlot(0, 0)
p0.showGrid(x = True, y = True, alpha = 1.0)

#have no x-axis tickmark below the upper plot (coordinate 0,0)
#without these lines, there will be separate coordinate systems with a gap inbetween
ax0 = p0.getAxis('bottom')      #get handle to x-axis 0
ax0.setStyle(showValues=False)  #this will remove the tick labels and reduces gap b/w plots almost to zero
                                #there will be a double line separating the plot rows


p1 = l.addPlot(1, 0)
p1.showGrid(x = True, y = True, alpha = 1.0)

p1.setXLink(p0)

l.layout.setSpacing(0.)
l.setContentsMargins(0., 0., 0., 0.)

if __name__ == '__main__':
    import sys
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()