matplotlib-users

RE: [Matplotlib-users] simple api question

[Kuzminski, S. R <SKu...@fa...>]

Thanks, that worked for the line being plotted, although the legend box
and axis are still aliased.  Part of my requirements include supporting
presentation quality printing.  I would like to just use Agg as GD has
dependency issues and keeps popping up other problems ( not to mention
how great the Agg output looks ).  But that great looking anti-aliasing
doesn't print well, so ideally there would be a 'global' level flag that
controls aliasing ( or not ) for everything drawn.  I know when the
image is being created for viewing or for printing and so can set the
flag accordingly.

S

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...]=20
Sent: Monday, March 08, 2004 8:16 AM
To: Kuzminski, Stefan R
Cc: mat...@li...
Subject: Re: [Matplotlib-users] simple api question

>>>>> "Kuzminski," =3D=3D Kuzminski, Stefan R <SKu...@fa...>
writes:

    Kuzminski,> I got the .51 release, looks great.  I need to
    Kuzminski,> set_antialiased() on the Renderer, but I'm not sure
    Kuzminski,> how to get the renderer object correctly.  If I call
    Kuzminski,> gca() I get the SubPlot, but the renderer member is
    Kuzminski,> None.  Any advice would be appreciated.

There is no way to set antialiased on the renderer itself, just on the
individual objects (lines etc).
 =20
  plot([1,2,3], antialiased=3DFalse)

or=20

  lines =3D plot(x1,y1,x2,y2)
  set(lines, 'antialiased', False)

or set lines.antialiased in matplotlibrc to the default you want.

Unfortunately, agg does not yet respect antialiased =3D=3D False for all
primitives, currently only lines.

See also

  http://matplotlib.sourceforge.net/faq.html#MATPLOTLIBRC
  http://matplotlib.sourceforge.net/faq.html#CUSTOM

Can you tell me what you're trying to do?

JDH

RE: [Matplotlib-users] simple api question

[Kuzminski, S. R <SKu...@fa...>]

The GD output looks good when printed, maybe I will switch between the 2
( Agg for display, GD for printing ).  The Agg un-aliased lines don't
come out quite as well, they seem to render more of the pixels for each
point on the line.  Nice to have the different backend options.

S   =20

-----Original Message-----
From: John Hunter [mailto:jdh...@ni...]=20
Sent: Monday, March 08, 2004 8:37 AM
To: Kuzminski, Stefan R
Cc: mat...@li...
Subject: Re: [Matplotlib-users] simple api question

>>>>> "Kuzminski," =3D=3D Kuzminski, Stefan R <SKu...@fa...>
writes:

    Kuzminski> Thanks, that worked for the line being plotted,
    Kuzminski> although the legend box and axis are still aliased.
    Kuzminski> Part of my requirements include supporting
    Kuzminski> presentation quality printing.  I would like to just
    Kuzminski> use Agg as GD has dependency issues and keeps popping
    Kuzminski> up other problems ( not to mention how great the Agg
    Kuzminski> output looks ).  But that great looking anti-aliasing
    Kuzminski> doesn't print well, so ideally there would be a
    Kuzminski> 'global' level flag that controls aliasing ( or not )
    Kuzminski> for everything drawn.  I know when the image is being
    Kuzminski> created for viewing or for printing and so can set the
    Kuzminski> flag accordingly.

I'll work on getting the rest of the objects to respect the
antialiased flag.  You can control antialiasing for all lines globally
with rcParams

  http://matplotlib.sourceforge.net/faq.html#CUSTOM


JDH

Re: [Matplotlib-users] simple api question

[John H. <jdh...@ac...>]

>>>>> "Kuzminski," == Kuzminski, Stefan R <SKu...@fa...> writes:

    Stephan> The GD output looks good when printed, maybe I will
    Stephan> switch between the 2 ( Agg for display, GD for
    Stephan> printing ).  The Agg un-aliased lines don't come out
    Stephan> quite as well, they seem to render more of the pixels
    Stephan> for each point on the line.  Nice to have the
    Stephan> different backend options.

This has to do with how agg handles subpixel positioning - I've
emailed the agg list and gotten some advice but haven't come up with a
good system to make the lines appear the same thickness in the aliased
and antialiased cases.  I'm still working on it.

In the meantime, here is a little backend magic that will make it
easier for you to print to your backend of choice. This example
displays the image in the default GUI (GTKAgg for me) and prints
with GD.  

    from matplotlib.backends.backend_gd import FigureCanvasGD
    from matplotlib.matlab import *

    plot([1,2,3])

    manager = get_current_fig_manager()
    canvasgd = manager.canvas.switch_backends(FigureCanvasGD)
    canvasgd.print_figure('gdfig')
    show()

print_figure takes the same args as savefig.

gd has a pesky color allocation bug that I haven't figured out that
you may bump into.

JDH

Re: [Matplotlib-users] simple api question

[John H. <jdh...@ac...>]

>>>>> "Kuzminski," == Kuzminski, Stefan R <SKu...@fa...> writes:

    Kuzminski> Thanks, that worked for the line being plotted,
    Kuzminski> although the legend box and axis are still aliased.
    Kuzminski> Part of my requirements include supporting
    Kuzminski> presentation quality printing.  I would like to just
    Kuzminski> use Agg as GD has dependency issues and keeps popping
    Kuzminski> up other problems ( not to mention how great the Agg
    Kuzminski> output looks ).  But that great looking anti-aliasing
    Kuzminski> doesn't print well, so ideally there would be a
    Kuzminski> 'global' level flag that controls aliasing ( or not )
    Kuzminski> for everything drawn.  I know when the image is being
    Kuzminski> created for viewing or for printing and so can set the
    Kuzminski> flag accordingly.

I'll work on getting the rest of the objects to respect the
antialiased flag.  You can control antialiasing for all lines globally
with rcParams

  http://matplotlib.sourceforge.net/faq.html#CUSTOM


JDH