Right axis plot always behind left axis plot

[dhabbyc]

Hello,

 I've been modifying the Multi axis example using a BarCharItem on the left axis and a PlotCurveItem in the second. No matter what I do the right plot always stays behind the left one.

 Here is what I'm doing:

# -*- coding: utf-8 -*-

"""

Demonstrates a way to put multiple axes around a single plot. 

(This will eventually become a built-in feature of PlotItem)

"""

#import initExample ## Add path to library (just for examples; you do not need this)

import pyqtgraph as pg

from pyqtgraph.Qt import QtCore, QtGui

import numpy as np

pg.mkQApp()

pw = pg.PlotWidget()

pw.show()

pw.setWindowTitle('pyqtgraph example: MultiplePlotAxes')

p1 = pw.plotItem

print p1.scene()

l = pg.LegendItem((100,60), offset=(70,30)) 

l.setParentItem(p1.getViewBox())

p1.setLabels(left='axis 1')

## create a new ViewBox, link the right axis to its coordinate system

p2 = pg.ViewBox()

p1.showAxis('right')

p1.scene().addItem(p2)

p1.getAxis('right').linkToView(p2)

p2.setXLink(p1)

p1.getAxis('right').setLabel('axis2', color='#0000ff')

## Handle view resizing 

def updateViews():

    ## view has resized; update auxiliary views to match

    global p1, p2

    p2.setGeometry(p1.vb.sceneBoundingRect())

    

    ## need to re-update linked axes since this was called

    ## incorrectly while views had different shapes.

    ## (probably this should be handled in ViewBox.resizeEvent)

    p2.linkedViewChanged(p1.vb, p2.XAxis)

updateViews()

p1.vb.sigResized.connect(updateViews)

#one = p1.plot([1,2,4,8,16,32])

one = pg.BarGraphItem(x = [0,1,2,3,4,5], height = [100,100,100,100,100, 50], width = 1)

two = pg.PlotCurveItem([10,20,40,80,40,20], pen='b')

p1.addItem(one)

p2.addItem(two)

two.setZValue(10000)

l.addItem(one, 'one')

l.addItem(two, 'two')

## Start Qt event loop unless running in interactive mode or using pyside.

if __name__ == '__main__':

    import sys

    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):

        QtGui.QApplication.instance().exec_()

Is there a way to fix this?

Thanks in advance.

D.

 

[Patrick]

Try changing

two.setZValue(10000)

to

p2.setZValue(10000)

I think maybe the z-order of the plots inside each ViewBox might be independent from the z-order of the actual ViewBoxes? So this puts one ViewBox behind the other, while you might have just been playing with the z-order within each ViewBox separately?

[Diego Mancilla]

Hello Patrick,

 You were right. It was enough to set the "secondary" viewbox zvalue to 0 and put the line above the bar (setting z value again). By default vieboxes have a zvalue of -100. Now I have to correct a related issue for "clicked" items (I need to know if I'm clicking the bar plot or the line plot), but I have it figured out.

Thank you.

D.  

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