Revision: 4243
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=4243&view=rev
Author: mdboom
Date: 2007-11-13 07:15:36 -0800 (Tue, 13 Nov 2007)
Log Message:
-----------
All backends can write to file-like objects rather than only regular files.
Modified Paths:
--------------
trunk/matplotlib/CHANGELOG
trunk/matplotlib/lib/matplotlib/backends/backend_gtk.py
trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py
trunk/matplotlib/lib/matplotlib/backends/backend_ps.py
trunk/matplotlib/lib/matplotlib/backends/backend_svg.py
trunk/matplotlib/lib/matplotlib/backends/backend_wx.py
Modified: trunk/matplotlib/CHANGELOG
===================================================================
--- trunk/matplotlib/CHANGELOG 2007-11-13 13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/CHANGELOG 2007-11-13 15:15:36 UTC (rev 4243)
@@ -1,3 +1,7 @@
+2007-11-13 All backends now support writing to a file-like object, not
+ just a regular file. savefig() can be passed a file-like
+ object in place of a file path. - MGD
+
2007-11-13 Improved the default backend selection at build time:
SVG -> Agg -> TkAgg -> WXAgg -> GTK -> GTKAgg. The last usable
backend in this progression will be chosen in the default
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_gtk.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_gtk.py 2007-11-13
13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_gtk.py 2007-11-13
15:15:36 UTC (rev 4243)
@@ -365,11 +365,24 @@
pixbuf.get_from_drawable(pixmap, pixmap.get_colormap(),
0, 0, 0, 0, width, height)
- try:
- pixbuf.save(filename, format)
- except gobject.GError, exc:
- error_msg_gtk('Save figure failure:\n%s' % (exc,), parent=self)
-
+ if is_string_like(filename):
+ try:
+ pixbuf.save(filename, format)
+ except gobject.GError, exc:
+ error_msg_gtk('Save figure failure:\n%s' % (exc,), parent=self)
+ elif hasattr(filename, 'write') and callable(filename.write):
+ if hasattr(pixbuf, 'save_to_callback'):
+ def save_callback(buf, data=None):
+ data.write(buf)
+ try:
+ pixbuf.save_to_callback(save_callback, format,
user_data=filename)
+ except gobject.GError, exc:
+ error_msg_gtk('Save figure failure:\n%s' % (exc,),
parent=self)
+ else:
+ raise ValueError("Saving to a Python file-like object is only
supported by PyGTK >= 2.8")
+ else:
+ raise ValueError("filename must be a path or a file-like object")
+
def get_default_filetype(self):
return 'png'
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py 2007-11-13
13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_pdf.py 2007-11-13
15:15:36 UTC (rev 4243)
@@ -325,7 +325,15 @@
self.width, self.height = width, height
self.nextObject = 1 # next free object id
self.xrefTable = [ [0, 65535, 'the zero object'] ]
- fh = file(filename, 'wb')
+ self.passed_in_file_object = False
+ if is_string_like(filename):
+ fh = file(filename, 'wb')
+ elif hasattr(filename, 'write') and callable(filename.write):
+ fh = filename
+ self.passed_in_file_object = True
+ else:
+ raise ValueError("filename must be a path or a file-like object")
+
self.fh = fh
self.currentstream = None # stream object to write to, if any
fh.write("%PDF-1.4\n") # 1.4 is the first version to have alpha
@@ -423,7 +431,8 @@
self.writeMarkers()
self.writeXref()
self.writeTrailer()
- self.fh.close()
+ if not self.passed_in_file_object:
+ self.fh.close()
def write(self, data):
if self.currentstream is None:
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_ps.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_ps.py 2007-11-13
13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_ps.py 2007-11-13
15:15:36 UTC (rev 4243)
@@ -1047,10 +1047,16 @@
written into this file object.
"""
isEPSF = format == 'eps'
- title = outfile
-
- # write to a temp file, we'll move it to outfile when done
- tmpfile = os.path.join(gettempdir(), md5.md5(outfile).hexdigest())
+ passed_in_file_object = False
+ if is_string_like(outfile):
+ title = outfile
+ tmpfile = os.path.join(gettempdir(), md5.md5(outfile).hexdigest())
+ elif hasattr(outfile, 'write') and callable(outfile.write):
+ title = None
+ tmpfile = os.path.join(gettempdir(),
md5.md5(str(hash(outfile))).hexdigest())
+ passed_in_file_object = True
+ else:
+ raise ValueError("outfile must be a path or a file-like object")
fh = file(tmpfile, 'w')
# find the appropriate papertype
@@ -1168,10 +1174,11 @@
elif rcParams['ps.usedistiller'] == 'xpdf':
xpdf_distill(tmpfile, isEPSF, ptype=papertype, bbox=bbox)
- if isinstance(outfile, file):
+ if passed_in_file_object:
fh = file(tmpfile)
print >>outfile, fh.read()
- else: shutil.move(tmpfile, outfile)
+ else:
+ shutil.move(tmpfile, outfile)
def _print_figure_tex(self, outfile, format, dpi, facecolor, edgecolor,
orientation, isLandscape, papertype):
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_svg.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_svg.py 2007-11-13
13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_svg.py 2007-11-13
15:15:36 UTC (rev 4243)
@@ -5,6 +5,7 @@
from matplotlib import verbose, __version__, rcParams
from matplotlib.backend_bases import RendererBase, GraphicsContextBase,\
FigureManagerBase, FigureCanvasBase
+from matplotlib.cbook import is_string_like
from matplotlib.colors import rgb2hex
from matplotlib.figure import Figure
from matplotlib.font_manager import findfont, FontProperties
@@ -458,15 +459,27 @@
'svgz': 'Scalable Vector Graphics'}
def print_svg(self, filename, *args, **kwargs):
- svgwriter = codecs.open(filename, 'w', 'utf-8')
- return self._print_svg(filename, svgwriter)
-
+ if is_string_like(filename):
+ fh_to_close = svgwriter = codecs.open(filename, 'w', 'utf-8')
+ elif hasattr(filename, 'write') and callable(filename.write):
+ svgwriter = codecs.EncodedFile(filename, 'utf-8')
+ fh_to_close = None
+ else:
+ raise ValueError("filename must be a path or a file-like object")
+ return self._print_svg(filename, svgwriter, fh_to_close)
+
def print_svgz(self, filename, *args, **kwargs):
- gzipwriter = gzip.GzipFile(filename, 'w')
- svgwriter = codecs.EncodedFile(gzipwriter, 'utf-8')
- return self._print_svg(filename, svgwriter)
+ if is_string_like(filename):
+ gzipwriter = gzip.GzipFile(filename, 'w')
+ fh_to_close = svgwriter = codecs.EncodedFile(gzipwriter, 'utf-8')
+ elif hasattr(filename, 'write') and callable(filename.write):
+ fh_to_close = gzipwriter = gzip.GzipFile(fileobj=filename,
mode='w')
+ svgwriter = codecs.EncodedFile(gzipwriter, 'utf-8')
+ else:
+ raise ValueError("filename must be a path or a file-like object")
+ return self._print_svg(filename, svgwriter, fh_to_close)
- def _print_svg(self, filename, svgwriter):
+ def _print_svg(self, filename, svgwriter, fh_to_close=None):
self.figure.dpi.set(72)
width, height = self.figure.get_size_inches()
w, h = width*72, height*72
@@ -474,7 +487,8 @@
renderer = RendererSVG(w, h, svgwriter, filename)
self.figure.draw(renderer)
renderer.finish()
- svgwriter.close()
+ if fh_to_close is not None:
+ svgwriter.close()
def get_default_filetype(self):
return 'svg'
Modified: trunk/matplotlib/lib/matplotlib/backends/backend_wx.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/backends/backend_wx.py 2007-11-13
13:50:29 UTC (rev 4242)
+++ trunk/matplotlib/lib/matplotlib/backends/backend_wx.py 2007-11-13
15:15:36 UTC (rev 4243)
@@ -152,7 +152,7 @@
cursors
from matplotlib._pylab_helpers import Gcf
from matplotlib.artist import Artist
-from matplotlib.cbook import exception_to_str
+from matplotlib.cbook import exception_to_str, is_string_like
from matplotlib.figure import Figure
from matplotlib.text import _process_text_args, Text
from matplotlib.widgets import SubplotTool
@@ -1030,12 +1030,17 @@
# Now that we have rendered into the bitmap, save it
# to the appropriate file type and clean up
- if not self.bitmap.SaveFile(filename, filetype):
- DEBUG_MSG('print_figure() file save error', 4, self)
- # note the error must be displayed here because trapping
- # the error on a call or print_figure may not work because
- # printing can be qued and called from realize
- raise RuntimeError('Could not save figure to %s\n' % (filename))
+ if is_string_like(filename):
+ if not self.bitmap.SaveFile(filename, filetype):
+ DEBUG_MSG('print_figure() file save error', 4, self)
+ # note the error must be displayed here because trapping
+ # the error on a call or print_figure may not work because
+ # printing can be qued and called from realize
+ raise RuntimeError('Could not save figure to %s\n' %
(filename))
+ elif hasattr(filename, 'write') and callable(filename.write):
+ if not self.bitmap.ConvertToImage().SaveStream(filename, filetype):
+ DEBUG_MSG('print_figure() file save error', 4, self)
+ raise RuntimeError('Could not save figure to %s\n' %
(filename))
# Restore everything to normal
self.bitmap = origBitmap
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