Plot Grid not shown

[Stefan H]

Hello,

I have problems to get the Plot Grid shown for my custom layout PlotWidget.

So I have GraphicsLayoutWidget() which contains multiple ViewBoxes with linked AxisItems, every thing is shown correctly except the Grid. When I turn on the grid by calling setGrid on the AxisItem also the ticks on the axis disappear and no grid lines are shown.

Does anyone have a hint for me, why this is not working? 

Here is some simple example code:

import pyqtgraph as pg
from PyQt4 import QtGui
import numpy as np


def main():
    import sys
    app = QtGui.QApplication(sys.argv)


    plotLayout = pg.GraphicsLayoutWidget()




    p1 = pg.ViewBox()
   
    line = pg.PlotDataItem(y=np.random.random(400))
    p1.addItem(line)


    plotLayout.addItem(p1,0,0)


    xAxis = pg.AxisItem('bottom')
    xAxis.setZValue(-1000)
    xAxis.setFlag(xAxis.ItemNegativeZStacksBehindParent)
    xAxis.setGrid(1.0)
    xAxis.linkToView(p1)
    plotLayout.addItem(xAxis,1,0)


    plotLayout.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Thank you,

Stefan

[Luke Campagnola]

On Mon, Apr 28, 2014 at 2:31 AM, Stefan H <stefan.ho...@gmail.com> wrote:

So I have GraphicsLayoutWidget() which contains multiple ViewBoxes with linked AxisItems, every thing is shown correctly except the Grid. When I turn on the grid by calling setGrid on the AxisItem also the ticks on the axis disappear and no grid lines are shown.

[snip] 

    xAxis.setGrid(1.0)

 The alpha value should be in the range (0-255); this line makes the grid lines mostly transparent. 

I'll update the documentation to clarify this.

[Stefan H]

Thank you, now the grid is shown correctly