change axis linewidth, axis font and ticks style

[damia...@gmail.com]

Hi everyone, I have a question about how I can change axis  linewidth, axis font and axis ticks style...  for each plot in the example below

Have you some example about that?

Thank you very much in advance

Damián

from pyqtgraph.Qt import QtGui, QtCore

import numpy as np

import pyqtgraph as pg

app = QtGui.QApplication([])

x = np.linspace(-50, 50, 1000)

y = np.sin(x) / x

win = pg.GraphicsWindow(title="View Linking Examples")

win.resize(800,600)

win.addLabel("Linked Views", colspan=2)

win.nextRow()

p1 = win.addPlot(x=x, y=y, name="Plot1", title="Plot1")

p2 = win.addPlot(x=x, y=y, name="Plot2", title="Plot2: Y linked with Plot1")

p2.setLabel('bottom', "Label to test offset")

p2.setYLink('Plot1')  ## test linking by name

## create plots 3 and 4 out of order

p4 = win.addPlot(x=x, y=y, name="Plot4", title="Plot4: X -> Plot3 (deferred), Y -> Plot1", row=2, col=1)

p4.setXLink('Plot3')  ## Plot3 has not been created yet, but this should still work anyway.

p4.setYLink(p1)

p3 = win.addPlot(x=x, y=y, name="Plot3", title="Plot3: X linked with Plot1", row=2, col=0)

p3.setXLink(p1)

p3.setLabel('left', "Label to test offset")

#QtGui.QApplication.processEvents()

## 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_()

[Luke Campagnola]

On Thu, Jan 17, 2013 at 12:03 PM, <damia...@gmail.com> wrote:

Hi everyone, I have a question about how I can change axis  linewidth, axis font and axis ticks style...  for each plot in the example below

Have you some example about that?

AxisItem has a setPen() method that you can use to change the color and line width of the axis line and ticks as well as the text color. 

For example:

    pen = pg.mkPen(color=(255,255,200), width=1)

    plotWidget.plotItem.getAxis('left').setPen(pen)

    plotWidget.plotItem.getAxis('bottom').setPen(pen)

AxisItem also has a 'tickLength' attribute which determines how long (and in which direction) the ticks should be. 

Does that answer your question? I'm not sure what you mean by 'tick style'. 

Luke

 

[JHallas]

Oddly enough I came here to ask about the axis font style.  I can use html to change the title and axes using setTitle or setLabel and <font size="5">AxisLabel</font>, but the font size of the units on the axes don't change and I would like to set the font size in pixels.  On the title, it works with

setTitle('Title',size='10px')

but if I try a similar thing with 

setLabel('bottom','BottomAxisLabel',size='10px')

the axis label disappears until I clear the plot.  I've tried 

a=window.getAxis('bottom')

a.font.setPixelSize(10)

but a.font.pixelSize() doesn't change and the font size on the plot doesn't change

I then tried 

b=QtGui.QFont()

b.setPixelSize(10)

a.setFont(b)

This correctly sets a.font.pixelSize() to 10, but the axis font size doesn't actually change.  I'm sure there's a simple solution I'm not seeing.

Thanks for your help in advance

[damia...@gmail.com]

Thank very much!!  It works perfect

Damián

[Luke Campagnola]

On Thu, Jan 17, 2013 at 1:31 PM, JHallas <jmha...@gmail.com> wrote:

Oddly enough I came here to ask about the axis font style.  I can use html to change the title and axes using setTitle or setLabel and <font size="5">AxisLabel</font>, but the font size of the units on the axes don't change and I would like to set the font size in pixels.  On the title, it works with

setTitle('Title',size='10px')

but if I try a similar thing with 

setLabel('bottom','BottomAxisLabel',size='10px')

the axis label disappears until I clear the plot.

The way the axis labels are implemented, the final HTML looks like:

    <span style="(style options)">Label Text (Units)</span>

The style options are constructed from the extra keyword arguments given to setLabel. 

So you just need to make sure the options you give are valid CSS (which is probably why the label disappeared).

    labelStyle = {'color': '#FFF'; 'font-size': '16px'}

    plt.setLabel('bottom', 'Label Text', 'Units', **labelStyle)

I'll update the documentation to make all of these issues more clear.

Luke

[JHallas]

That worked great, thanks.  Is there any easy way to axis the font size for the tick values?

[JHallas]

Just noticed that my question makes no sense.  How would I go about modifying the font size for the tick values on the axis?

Thanks,

J.

[Luke Campagnola]

On Mon, Jan 21, 2013 at 6:28 PM, JHallas <jmha...@gmail.com> wrote:
> How would I go about
> modifying the font size for the tick values on the axis?

Hmmmmm.
You can't. At least, not without modifying AxisItem.drawPicture().
Around line 625, there is a comment that looks like

## Draw text until there is no more room (or no more text)

You can add a call to p.setFont() there to set the font size. It's an
easy change; I'll try to get it into the next release.


Luke

[JHallas]

Thanks a lot for all of your help.  I appreciate it greatly. Your software package has made my work go much quicker and resulted in a much better looking and working program than if I had started from scratch.  

[pranav parashar]

well there is one way to directly change the font size for an axis item:

b=QtGui.QFont()

b.setPixelSize(20)

x_axisitem.tickFont = b

[Upol Ryskulova]

Hello Luke,

Sorry for opening this old issue, But I am facing with the same problem. I was not able to change the font of the tickValues. Right now I am using your latest release. 

Could you please guide me. I overwrited the AxisItem tickValues function and displaying time axis. 

       fontForTickValues = QtGui.QFont()
       fontForTickValues.setPixelSize(50)

       fontForTickValues.setBold(True)

       def addUpperLowerGraphs(self):

                self.upperName = self.l2.addLabel(vmicText)

                self.axis = TimeAxisItem('bottom')

                self.axis.setStyle(tickFont = fontForTickValues)

                self.axis.setPen(axisPen)

                self.upperGraph = self.l2.addPlot(name = "upper")

                self.upperGraph.showGrid(x=True,y=True)

                self.upperGraph.setContentsMargins(0.0,20.0,0.0,0.0)

                self.l2.nextRow()

                self.lowerName = self.l2.addLabel(quraText)

                self.lowerGraph = self.l2.addPlot(name = "lower",axisItems={'bottom':self.axis})

But unfortunately I cannot see any change in tick values' font.

I'd be very glad for your advice.

Thanks you.

Regards,

Upol

[Upol Ryskulova]

Hello again,

I was able to change tickFont as pranav parashar did. But now I have encountered with different problem. When I enlarged the tickFont, tick values are conciding with axis line.

Attached image.

[Justin Hallas]

I believe there is a padding parameter that you have to modify to push text away from axis. I don't have access to my code currently but I'll update tomorrow if you haven't got it by then.

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[Upol Ryskulova]

Hello Justin,

I will be very glad if you share your solution.

[Justin Hallas]

w1 = pg.PlotWidget()
w1.plot(X,Y)

labelStyle = {'color': '#FFF', 'font-size': '14px'}

w1.setLabel('bottom', 'X', **labelStyle)
w1.setLabel('left', 'Y', **labelStyle)

w1.getAxis('bottom').setHeight(int(14 * 1.7 + 5))
w1.getAxis('left').setWidth(int(14 * 2.6 + 8))

It's kind of kluge-y but it works.   The formula inside of the setHeight and setWidth is just something I came up with after experimenting to keep the text away from the axis.  It only works over a certain range of font sizes.

On Thu, Apr 16, 2015 at 11:25 PM Upol Ryskulova <upol.ry...@gmail.com> wrote:

Hello Justin,

I will be very glad if you share your solution.

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[Upol Ryskulova]

Thank you Justin. 

Yesterday I did it by using this axis.setStyle(tickTextOffset=13). 

(for ones that will come across with the same problem)

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