Changing tick placement and reversing axes

[SPSkinner]

Dear All,

I am attempting to build a pyqtgraph app in which I can have the axis labels and ticks placed inside the plot window rather than outside and I would also like to reverse the scales on the axes.

Is there an easy way to do this or would I need to subclass AxisItem and code my own extensions?

Thanks

Simon

[Luke Campagnola]

On Fri, Apr 25, 2014 at 10:05 AM, SPSkinner <simon.p...@gmail.com> wrote:

I am attempting to build a pyqtgraph app in which I can have the axis labels and ticks placed inside the plot window rather than outside and I would also like to reverse the scales on the axes.

Is there an easy way to do this or would I need to subclass AxisItem and code my own extensions?

 

Here are a couple of ideas to get you started. Let me know if you run into issues that are not covered here

Option 1:

import pyqtgraph as pg

w = pg.GraphicsWindow()

vb = w.addViewBox()

grid = pg.GridItem()

vb.addItem(grid)

vb.invertY()

Option 2:

import pyqtgraph as pg

class ViewWithAxes(pg.ViewBox):

    def __init__(self):

        pg.ViewBox.__init__(self)

        self.invertY()

        self.axis1 = pg.AxisItem(orientation='right', linkView=self, maxTickLength=10)

        self.axis1.setParentItem(self)

    def resizeEvent(self, ev):

        self.axis1.setMinimumHeight(self.height())

        self.axis1.setMaximumHeight(self.height())

        return pg.ViewBox.resizeEvent(self, ev)

w = pg.GraphicsWindow()

vb = ViewWithAxes()

w.addItem(vb)

[SPSkinner]

Hi, 

Thanks for the fast response.  I have managed to flip the Y axis, but is there a way to flip the X axis as well? I noticed that there wasn't an invertY method for the AxisItem, but logically the function would be the same as for the Y so I could simply add a function, couldn't I?

Thanks

Simon

[Luke Campagnola]

On Sun, Apr 27, 2014 at 3:04 PM, SPSkinner <simon.p...@gmail.com> wrote:

I have managed to flip the Y axis, but is there a way to flip the X axis as well? I noticed that there wasn't an invertY method for the AxisItem, but logically the function would be the same as for the Y so I could simply add a function, couldn't I?

It takes a bit more than just the invert function. But since you are not the first person to ask for this, I have just added it to the develop branch. You can see the changes here if you are curious:  https://github.com/pyqtgraph/pyqtgraph/commit/c6f2e9c2a92cbdbf1c58738de9771b80cbbe54b9

Luke