Thread: [Matplotlib-users] transparent symbols

Hello, I attached a sample. I'm trying to plot a line using markers and
I would like those markers to be transparent. I use the keyword
'alpha=0.2' to set the transparency although the marker are not
transparent? Does anyone know how to make this work? Thanks for the
help!

Also, is it possible to set autoscale for just x-axis or just y-axis? I
haven't found a way to do this. Thanks again.

Jeff

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Hello, I attached a sample. I'm trying to plot a line using
    Jeff> markers and I would like those markers to be transparent. I
    Jeff> use the keyword 'alpha=0.2' to set the transparency although
    Jeff> the marker are not transparent? Does anyone know how to make
    Jeff> this work? Thanks for the help!


See the recent thread "transparent markerfacecolors"

  http://sourceforge.net/mailarchive/message.php?msg_id=12261949


Basically, this is a bug but you can work around it with scatter.

    Jeff> Also, is it possible to set autoscale for just x-axis or
    Jeff> just y-axis? I haven't found a way to do this. Thanks again.

You can do this by setting a custom ticker.locator for the axis that
you don't want autoscaled, following the examples major_minor_demo*.py
and Chapter 5 of the user's guide.

JDH

Great thank you.  

One more question. I also want to change the tick mark attributes like
color, fontsize, rotation etc. I used these lines of code:


    # set x-axes tick label attributes
    axesA.set_yticklabels(axesA.get_xticklabels(), rotation=0,
fontsize=5, color='k')
    axesD.set_yticklabels(axesD.get_xticklabels(), rotation=0,
fontsize=5, color='k')
    # set y-axes tick label attributes    
    axesA.set_yticklabels(axesA.get_yticklabels(), rotation=0,
fontsize=5, color='k')
    axesD.set_yticklabels(axesD.get_yticklabels(), rotation=0,
fontsize=5, color='k')

I get an error because get_ticklabels() returns an instance of label
strings, not the strings themselves. How can I convert these into a
useful string so the above code works? Or is there a better way to do
this?

Thanks again!        

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Wednesday, July 13, 2005 10:41 AM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] transparent symbols

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Hello, I attached a sample. I'm trying to plot a line using
    Jeff> markers and I would like those markers to be transparent. I
    Jeff> use the keyword 'alpha=0.2' to set the transparency although
    Jeff> the marker are not transparent? Does anyone know how to make
    Jeff> this work? Thanks for the help!


See the recent thread "transparent markerfacecolors"

  http://sourceforge.net/mailarchive/message.php?msg_id=12261949


Basically, this is a bug but you can work around it with scatter.

    Jeff> Also, is it possible to set autoscale for just x-axis or
    Jeff> just y-axis? I haven't found a way to do this. Thanks again.

You can do this by setting a custom ticker.locator for the axis that
you don't want autoscaled, following the examples major_minor_demo*.py
and Chapter 5 of the user's guide.

JDH

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Great thank you.  One more question. I also want to change
    Jeff> the tick mark attributes like color, fontsize, rotation
    Jeff> etc. I used these lines of code:


    axesA.set_yticklabels(axesA.get_xticklabels(), rotation=0, ....
              ^                     ^

Not your question, but are you mixing up x and y here?

    Jeff> I get an error because get_ticklabels() returns an instance
    Jeff> of label strings, not the strings themselves. How can I
    Jeff> convert these into a useful string so the above code works?
    Jeff> Or is there a better way to do this?

There are several ways to customize these properties.  One way is to
get a list of ticks and then customize them


    xticks = ax.xaxis.get_major_ticks()

    labels = [xtick.label1 for xtick in xticks]
    lines =  [xtick.tick1line for xtick in xticks]

    setp(lines, linewidth=2)
    setp(labels, color='red', fontsize=20)

The Tick instances have the following attributes, as detailed here
http://matplotlib.sourceforge.net/matplotlib.axis.html#Tick

      tick1line  : a Line2D instance
      tick2line  : a Line2D instance
      gridline   : a Line2D instance
      label1     : a Text instance
      label2     : a Text instance
      gridOn     : a boolean which determines whether to draw the tickline
      tick1On    : a boolean which determines whether to draw the 1st tickline
      tick2On    : a boolean which determines whether to draw the 2nd tickline
      label1On   : a boolean which determines whether to draw tick label
      label2On   : a boolean which determines whether to draw tick label

JDH

Thanks John that helps. What is required to import so that 'setp' may be
used. I'm using WXAgg backend. Python chokes when I call setp(...).
thanks again.

J

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Thursday, July 14, 2005 11:12 AM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] transparent symbols

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Great thank you.  One more question. I also want to change
    Jeff> the tick mark attributes like color, fontsize, rotation
    Jeff> etc. I used these lines of code:


    axesA.set_yticklabels(axesA.get_xticklabels(), rotation=0, ....
              ^                     ^

Not your question, but are you mixing up x and y here?

    Jeff> I get an error because get_ticklabels() returns an instance
    Jeff> of label strings, not the strings themselves. How can I
    Jeff> convert these into a useful string so the above code works?
    Jeff> Or is there a better way to do this?

There are several ways to customize these properties.  One way is to
get a list of ticks and then customize them


    xticks = ax.xaxis.get_major_ticks()

    labels = [xtick.label1 for xtick in xticks]
    lines =  [xtick.tick1line for xtick in xticks]

    setp(lines, linewidth=2)
    setp(labels, color='red', fontsize=20)

The Tick instances have the following attributes, as detailed here
http://matplotlib.sourceforge.net/matplotlib.axis.html#Tick

      tick1line  : a Line2D instance
      tick2line  : a Line2D instance
      gridline   : a Line2D instance
      label1     : a Text instance
      label2     : a Text instance
      gridOn     : a boolean which determines whether to draw the
tickline
      tick1On    : a boolean which determines whether to draw the 1st
tickline
      tick2On    : a boolean which determines whether to draw the 2nd
tickline
      label1On   : a boolean which determines whether to draw tick label
      label2On   : a boolean which determines whether to draw tick label

JDH

Hello, I;m not sure how to access the tick attributes listed below.  I
tried the following:

    #turn off ticks    
    xticks  = axes.xaxis.get_major_ticks()
    xticks.tick1On  =   False
    xticks.tick2On  =   False

this doesn't seem to work. How do I access these attributes? Thanks.

Jeff


-----Original Message-----
From: John Hunter [mailto:jdh...@ni...] 
Sent: Thursday, July 14, 2005 11:12 AM
To: Jeff Peery
Cc: mat...@li...
Subject: Re: [Matplotlib-users] transparent symbols

>>>>> "Jeff" == Jeff Peery <jef...@se...> writes:

    Jeff> Great thank you.  One more question. I also want to change
    Jeff> the tick mark attributes like color, fontsize, rotation
    Jeff> etc. I used these lines of code:


    axesA.set_yticklabels(axesA.get_xticklabels(), rotation=0, ....
              ^                     ^

Not your question, but are you mixing up x and y here?

    Jeff> I get an error because get_ticklabels() returns an instance
    Jeff> of label strings, not the strings themselves. How can I
    Jeff> convert these into a useful string so the above code works?
    Jeff> Or is there a better way to do this?

There are several ways to customize these properties.  One way is to
get a list of ticks and then customize them


    xticks = ax.xaxis.get_major_ticks()

    labels = [xtick.label1 for xtick in xticks]
    lines =  [xtick.tick1line for xtick in xticks]

    setp(lines, linewidth=2)
    setp(labels, color='red', fontsize=20)

The Tick instances have the following attributes, as detailed here
http://matplotlib.sourceforge.net/matplotlib.axis.html#Tick

      tick1line  : a Line2D instance
      tick2line  : a Line2D instance
      gridline   : a Line2D instance
      label1     : a Text instance
      label2     : a Text instance
      gridOn     : a boolean which determines whether to draw the
tickline
      tick1On    : a boolean which determines whether to draw the 1st
tickline
      tick2On    : a boolean which determines whether to draw the 2nd
tickline
      label1On   : a boolean which determines whether to draw tick label
      label2On   : a boolean which determines whether to draw tick label

JDH

On Wednesday 20 July 2005 03:42 pm, Jeff Peery wrote:
> Hello, I;m not sure how to access the tick attributes listed below.  I
> tried the following:
>
>     #turn off ticks
>     xticks  = axes.xaxis.get_major_ticks()
>     xticks.tick1On  =   False
>     xticks.tick2On  =   False
>
> this doesn't seem to work. How do I access these attributes? Thanks.

xticks is a list. you'll need to do something like

xticks  = axes.xaxis.get_major_ticks()
for tick in xticks:
	tick.tick1On = False
	tick.tick2On = False

-- 

Darren