In the wxPython/wxWidget docs, I found the following.
Printing under Unix (GTK+)
Printing under Unix has always been a cause of problems as Unix does
not provide a standard way to display text and graphics on screen and
print it to a printer using the same application programming interface
- instead, displaying on screen is done via the X11 library while
printing has to be done with using PostScript commands. This was
particularly difficult to handle for the case of fonts with the result
that only a selected number of application could offer WYSIWYG under
Unix. Equally, wxWidgets offered its own printing implementation using
PostScript which never really matched the screen display.
Starting with version 2.8.X, the GNOME project provides printing
support through the libgnomeprint and libgnomeprintui libraries by
which especially the font problem is mostly solved. Beginning with
version 2.5.4, the GTK+ port of wxWidgets can make use of these
libraries if wxWidgets is configured accordingly and if the libraries
are present. You need to configure wxWidgets with the configure --with-
gnomeprint switch and your application will then search for the GNOME
print libraries at runtime. If they are found, printing will be done
through these, otherwise the application will fall back to the old
PostScript printing code. Note that the application will not require
the GNOME print libraries to be installed in order to run (there will
be no dependency on these libraries).
In version GTK+ 2.10, support for printing has been added to GTK+
itself. Support for this has been added to wxWidgets in the
development branch and it will be available for wxWidgets 3.0.
Perhaps this is helpful.
Michael
On Jan 10, 2009, at 3:23 AM, GRASS GIS wrote:
#205: warnings and errors when trying to print the display
-----------------------
+----------------------------------------------------
Reporter: msieczka | Owner: [email protected]
Type: defect | Status: reopened
Priority: major | Milestone: 6.4.0
Component: wxGUI | Version: svn-develbranch6
Resolution: | Keywords:
Platform: Linux | Cpu: x86-64
-----------------------
+----------------------------------------------------
Changes (by msieczka):
* status: closed => reopened
* resolution: worksforme =>
Comment:
In opposite to Mac, print preview works on Debian testing. But
WARNINGS
still crop out when I press the "Print" button in the print-preview
dialog:
{{{
(shoofi:8312): GnomePrint-WARNING **: Could not create filter from
description 'GnomePrintFilterSelect': filter
'GnomePrintFilterSelect' is
unknown
(shoofi:8312): GLib-GObject-WARNING **: invalid (NULL) pointer
instance
(shoofi:8312): GLib-GObject-CRITICAL **: g_signal_connect_data:
assertion
`G_TYPE_CHECK_INSTANCE (instance)' failed
(shoofi:8312): GnomePrint-WARNING **: Could not create filter from
description 'GnomePrintFilterClip [ GnomePrintFilterMultipage ]':
filter
'GnomePrintFilterClip' is unknown
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): libgnomeprintui-CRITICAL **:
gnome_print_layout_selector_load_filter: assertion
`GNOME_IS_PRINT_FILTER
(f)' failed
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_set: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_set: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_set: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): libgnomeprintui-CRITICAL **:
gnome_paper_selector_load_paper_size: assertion
`GNOME_IS_PAPER_SELECTOR
(ps)' failed
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_set: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): GLib-GObject-CRITICAL **: g_object_set: assertion
`G_IS_OBJECT (object)' failed
(shoofi:8312): GnomePrint-CRITICAL **: gnome_print_filter_reset:
assertion
`GNOME_IS_PRINT_FILTER (f)' failed
(shoofi:8312): GnomePrint-CRITICAL **: gnome_print_filter_flush:
assertion
`GNOME_IS_PRINT_FILTER (f)' failed
}}}
Then, switching between the PDF and PS output options yields another
set
of warnings:
{{{
(shoofi:8312): libgnomeprintui-CRITICAL **:
gnome_paper_selector_load_paper_size: assertion
`GNOME_IS_PAPER_SELECTOR
(ps)' failed
(shoofi:8312): libgnomeprintui-CRITICAL **:
gnome_paper_selector_load_paper_size: assertion
`GNOME_IS_PAPER_SELECTOR
(ps)' failed
** (shoofi:8312): WARNING **: could not set the value of
Settings.Document.Filter, node not found
}}}
Finally, when printing to PS the following pops up:
{{{
(shoofi:8312): GnomePrint-WARNING **: Could not create filter from
description 'frgba': filter 'frgba' is unknown
}}}
And the output PS takes forever to render in Evince (never completes).
Interestingly, there are 2 pages instead of 1.
The PDF output renders fine. However, also 2 pages instead of 1
(both with
the same content).
Also, scale&arrow overlay brings a solid black polygon covering all
the
map content below the scale&arrow, in the ouput PDF.
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/205#comment:4>
GRASS GIS <http://grass.osgeo.org>
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