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backend_ps.py
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backend_ps.py
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"""
A PostScript backend, which can produce both PostScript .ps and .eps
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import six
from six.moves import StringIO
import glob, math, os, shutil, sys, time, datetime
from matplotlib.compat.subprocess import subprocess
def _fn_name(): return sys._getframe(1).f_code.co_name
import io
from hashlib import md5
from tempfile import mkstemp
from matplotlib import verbose, __version__, rcParams, checkdep_ghostscript
from matplotlib._pylab_helpers import Gcf
from matplotlib.afm import AFM
from matplotlib.backend_bases import RendererBase, GraphicsContextBase,\
FigureManagerBase, FigureCanvasBase
from matplotlib.cbook import is_string_like, get_realpath_and_stat, \
is_writable_file_like, maxdict, file_requires_unicode
from matplotlib.figure import Figure
from matplotlib.font_manager import findfont, is_opentype_cff_font, get_font
from matplotlib.ft2font import KERNING_DEFAULT, LOAD_NO_HINTING
from matplotlib.ttconv import convert_ttf_to_ps
from matplotlib.mathtext import MathTextParser
from matplotlib._mathtext_data import uni2type1
from matplotlib.text import Text
from matplotlib.path import Path
from matplotlib import _path
from matplotlib.transforms import Affine2D
from matplotlib.backends.backend_mixed import MixedModeRenderer
import numpy as np
import binascii
import re
if sys.platform.startswith('win'): cmd_split = '&'
else: cmd_split = ';'
backend_version = 'Level II'
debugPS = 0
class PsBackendHelper(object):
def __init__(self):
self._cached = {}
@property
def gs_exe(self):
"""
excutable name of ghostscript.
"""
try:
return self._cached["gs_exe"]
except KeyError:
pass
gs_exe, gs_version = checkdep_ghostscript()
if gs_exe is None:
gs_exe = 'gs'
self._cached["gs_exe"] = gs_exe
return gs_exe
@property
def gs_version(self):
"""
version of ghostscript.
"""
try:
return self._cached["gs_version"]
except KeyError:
pass
from matplotlib.compat.subprocess import Popen, PIPE
s = Popen([str(self.gs_exe), " --version"], stdout=PIPE)
pipe, stderr = s.communicate()
if six.PY3:
ver = pipe.decode('ascii')
else:
ver = pipe
try:
gs_version = tuple(map(int, ver.strip().split(".")))
except ValueError:
# if something went wrong parsing return null version number
gs_version = (0, 0)
self._cached["gs_version"] = gs_version
return gs_version
@property
def supports_ps2write(self):
"""
True if the installed ghostscript supports ps2write device.
"""
return self.gs_version[0] >= 9
ps_backend_helper = PsBackendHelper()
papersize = {'letter': (8.5,11),
'legal': (8.5,14),
'ledger': (11,17),
'a0': (33.11,46.81),
'a1': (23.39,33.11),
'a2': (16.54,23.39),
'a3': (11.69,16.54),
'a4': (8.27,11.69),
'a5': (5.83,8.27),
'a6': (4.13,5.83),
'a7': (2.91,4.13),
'a8': (2.07,2.91),
'a9': (1.457,2.05),
'a10': (1.02,1.457),
'b0': (40.55,57.32),
'b1': (28.66,40.55),
'b2': (20.27,28.66),
'b3': (14.33,20.27),
'b4': (10.11,14.33),
'b5': (7.16,10.11),
'b6': (5.04,7.16),
'b7': (3.58,5.04),
'b8': (2.51,3.58),
'b9': (1.76,2.51),
'b10': (1.26,1.76)}
def _get_papertype(w, h):
keys = list(six.iterkeys(papersize))
keys.sort()
keys.reverse()
for key in keys:
if key.startswith('l'): continue
pw, ph = papersize[key]
if (w < pw) and (h < ph): return key
else:
return 'a0'
def _num_to_str(val):
if is_string_like(val): return val
ival = int(val)
if val==ival: return str(ival)
s = "%1.3f"%val
s = s.rstrip("0")
s = s.rstrip(".")
return s
def _nums_to_str(*args):
return ' '.join(map(_num_to_str,args))
def quote_ps_string(s):
"Quote dangerous characters of S for use in a PostScript string constant."
s = s.replace(b"\\", b"\\\\")
s = s.replace(b"(", b"\\(")
s = s.replace(b")", b"\\)")
s = s.replace(b"'", b"\\251")
s = s.replace(b"`", b"\\301")
s = re.sub(br"[^ -~\n]", lambda x: br"\%03o" % ord(x.group()), s)
return s.decode('ascii')
class RendererPS(RendererBase):
"""
The renderer handles all the drawing primitives using a graphics
context instance that controls the colors/styles.
"""
afmfontd = maxdict(50)
def __init__(self, width, height, pswriter, imagedpi=72):
"""
Although postscript itself is dpi independent, we need to
imform the image code about a requested dpi to generate high
res images and them scale them before embeddin them
"""
RendererBase.__init__(self)
self.width = width
self.height = height
self._pswriter = pswriter
if rcParams['text.usetex']:
self.textcnt = 0
self.psfrag = []
self.imagedpi = imagedpi
# current renderer state (None=uninitialised)
self.color = None
self.linewidth = None
self.linejoin = None
self.linecap = None
self.linedash = None
self.fontname = None
self.fontsize = None
self._hatches = {}
self.image_magnification = imagedpi/72.0
self._clip_paths = {}
self._path_collection_id = 0
self.used_characters = {}
self.mathtext_parser = MathTextParser("PS")
self._afm_font_dir = os.path.join(
rcParams['datapath'], 'fonts', 'afm')
def track_characters(self, font, s):
"""Keeps track of which characters are required from
each font."""
realpath, stat_key = get_realpath_and_stat(font.fname)
used_characters = self.used_characters.setdefault(
stat_key, (realpath, set()))
used_characters[1].update([ord(x) for x in s])
def merge_used_characters(self, other):
for stat_key, (realpath, charset) in six.iteritems(other):
used_characters = self.used_characters.setdefault(
stat_key, (realpath, set()))
used_characters[1].update(charset)
def set_color(self, r, g, b, store=1):
if (r,g,b) != self.color:
if r==g and r==b:
self._pswriter.write("%1.3f setgray\n"%r)
else:
self._pswriter.write("%1.3f %1.3f %1.3f setrgbcolor\n"%(r,g,b))
if store: self.color = (r,g,b)
def set_linewidth(self, linewidth, store=1):
linewidth = float(linewidth)
if linewidth != self.linewidth:
self._pswriter.write("%1.3f setlinewidth\n"%linewidth)
if store: self.linewidth = linewidth
def set_linejoin(self, linejoin, store=1):
if linejoin != self.linejoin:
self._pswriter.write("%d setlinejoin\n"%linejoin)
if store: self.linejoin = linejoin
def set_linecap(self, linecap, store=1):
if linecap != self.linecap:
self._pswriter.write("%d setlinecap\n"%linecap)
if store: self.linecap = linecap
def set_linedash(self, offset, seq, store=1):
if self.linedash is not None:
oldo, oldseq = self.linedash
if np.array_equal(seq, oldseq) and oldo == offset:
return
if seq is not None and len(seq):
s="[%s] %d setdash\n"%(_nums_to_str(*seq), offset)
self._pswriter.write(s)
else:
self._pswriter.write("[] 0 setdash\n")
if store:
self.linedash = (offset, seq)
def set_font(self, fontname, fontsize, store=1):
if rcParams['ps.useafm']: return
if (fontname,fontsize) != (self.fontname,self.fontsize):
out = ("/%s findfont\n"
"%1.3f scalefont\n"
"setfont\n" % (fontname, fontsize))
self._pswriter.write(out)
if store: self.fontname = fontname
if store: self.fontsize = fontsize
def create_hatch(self, hatch):
sidelen = 72
if hatch in self._hatches:
return self._hatches[hatch]
name = 'H%d' % len(self._hatches)
linewidth = rcParams['hatch.linewidth']
pageheight = self.height * 72
self._pswriter.write("""\
<< /PatternType 1
/PaintType 2
/TilingType 2
/BBox[0 0 %(sidelen)d %(sidelen)d]
/XStep %(sidelen)d
/YStep %(sidelen)d
/PaintProc {
pop
%(linewidth)f setlinewidth
""" % locals())
self._pswriter.write(
self._convert_path(Path.hatch(hatch), Affine2D().scale(sidelen),
simplify=False))
self._pswriter.write("""\
fill
stroke
} bind
>>
matrix
0.0 %(pageheight)f translate
makepattern
/%(name)s exch def
""" % locals())
self._hatches[hatch] = name
return name
def get_canvas_width_height(self):
'return the canvas width and height in display coords'
return self.width * 72.0, self.height * 72.0
def get_text_width_height_descent(self, s, prop, ismath):
"""
get the width and height in display coords of the string s
with FontPropertry prop
"""
if rcParams['text.usetex']:
texmanager = self.get_texmanager()
fontsize = prop.get_size_in_points()
w, h, d = texmanager.get_text_width_height_descent(s, fontsize,
renderer=self)
return w, h, d
if ismath:
width, height, descent, pswriter, used_characters = \
self.mathtext_parser.parse(s, 72, prop)
return width, height, descent
if rcParams['ps.useafm']:
if ismath: s = s[1:-1]
font = self._get_font_afm(prop)
l,b,w,h,d = font.get_str_bbox_and_descent(s)
fontsize = prop.get_size_in_points()
scale = 0.001*fontsize
w *= scale
h *= scale
d *= scale
return w, h, d
font = self._get_font_ttf(prop)
font.set_text(s, 0.0, flags=LOAD_NO_HINTING)
w, h = font.get_width_height()
w /= 64.0 # convert from subpixels
h /= 64.0
d = font.get_descent()
d /= 64.0
#print s, w, h
return w, h, d
def flipy(self):
'return true if small y numbers are top for renderer'
return False
def _get_font_afm(self, prop):
key = hash(prop)
font = self.afmfontd.get(key)
if font is None:
fname = findfont(prop, fontext='afm', directory=self._afm_font_dir)
if fname is None:
fname = findfont(
"Helvetica", fontext='afm', directory=self._afm_font_dir)
font = self.afmfontd.get(fname)
if font is None:
with io.open(fname, 'rb') as fh:
font = AFM(fh)
self.afmfontd[fname] = font
self.afmfontd[key] = font
return font
def _get_font_ttf(self, prop):
fname = findfont(prop)
font = get_font(fname)
font.clear()
size = prop.get_size_in_points()
font.set_size(size, 72.0)
return font
def _rgb(self, rgba):
h, w = rgba.shape[:2]
rgb = rgba[::-1, :, :3]
return h, w, rgb.tostring()
def _hex_lines(self, s, chars_per_line=128):
s = binascii.b2a_hex(s)
nhex = len(s)
lines = []
for i in range(0,nhex,chars_per_line):
limit = min(i+chars_per_line, nhex)
lines.append(s[i:limit])
return lines
def get_image_magnification(self):
"""
Get the factor by which to magnify images passed to draw_image.
Allows a backend to have images at a different resolution to other
artists.
"""
return self.image_magnification
def option_scale_image(self):
"""
ps backend support arbitrary scaling of image.
"""
return True
def option_image_nocomposite(self):
"""
return whether to generate a composite image from multiple images on
a set of axes
"""
return not rcParams['image.composite_image']
def _get_image_h_w_bits_command(self, im):
h, w, bits = self._rgb(im)
imagecmd = "false 3 colorimage"
return h, w, bits, imagecmd
def draw_image(self, gc, x, y, im, transform=None):
"""
Draw the Image instance into the current axes; x is the
distance in pixels from the left hand side of the canvas and y
is the distance from bottom
"""
h, w, bits, imagecmd = self._get_image_h_w_bits_command(im)
hexlines = b'\n'.join(self._hex_lines(bits)).decode('ascii')
if transform is None:
matrix = "1 0 0 1 0 0"
xscale = w / self.image_magnification
yscale = h / self.image_magnification
else:
matrix = " ".join(map(str, transform.frozen().to_values()))
xscale = 1.0
yscale = 1.0
figh = self.height * 72
#print 'values', origin, flipud, figh, h, y
bbox = gc.get_clip_rectangle()
clippath, clippath_trans = gc.get_clip_path()
clip = []
if bbox is not None:
clipx,clipy,clipw,cliph = bbox.bounds
clip.append('%s clipbox' % _nums_to_str(clipw, cliph, clipx, clipy))
if clippath is not None:
id = self._get_clip_path(clippath, clippath_trans)
clip.append('%s' % id)
clip = '\n'.join(clip)
#y = figh-(y+h)
ps = """gsave
%(clip)s
%(x)s %(y)s translate
[%(matrix)s] concat
%(xscale)s %(yscale)s scale
/DataString %(w)s string def
%(w)s %(h)s 8 [ %(w)s 0 0 -%(h)s 0 %(h)s ]
{
currentfile DataString readhexstring pop
} bind %(imagecmd)s
%(hexlines)s
grestore
""" % locals()
self._pswriter.write(ps)
def _convert_path(self, path, transform, clip=False, simplify=None):
ps = []
last_points = None
if clip:
clip = (0.0, 0.0, self.width * 72.0,
self.height * 72.0)
else:
clip = None
return _path.convert_to_string(
path, transform, clip, simplify, None,
6, [b'm', b'l', b'', b'c', b'cl'], True).decode('ascii')
def _get_clip_path(self, clippath, clippath_transform):
key = (clippath, id(clippath_transform))
pid = self._clip_paths.get(key)
if pid is None:
pid = 'c%x' % len(self._clip_paths)
ps_cmd = ['/%s {' % pid]
ps_cmd.append(self._convert_path(clippath, clippath_transform,
simplify=False))
ps_cmd.extend(['clip', 'newpath', '} bind def\n'])
self._pswriter.write('\n'.join(ps_cmd))
self._clip_paths[key] = pid
return pid
def draw_path(self, gc, path, transform, rgbFace=None):
"""
Draws a Path instance using the given affine transform.
"""
clip = (rgbFace is None and gc.get_hatch_path() is None)
simplify = path.should_simplify and clip
ps = self._convert_path(
path, transform, clip=clip, simplify=simplify)
self._draw_ps(ps, gc, rgbFace)
def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None):
"""
Draw the markers defined by path at each of the positions in x
and y. path coordinates are points, x and y coords will be
transformed by the transform
"""
if debugPS: self._pswriter.write('% draw_markers \n')
write = self._pswriter.write
if rgbFace:
if rgbFace[0]==rgbFace[1] and rgbFace[0]==rgbFace[2]:
ps_color = '%1.3f setgray' % rgbFace[0]
else:
ps_color = '%1.3f %1.3f %1.3f setrgbcolor' % rgbFace[:3]
# construct the generic marker command:
ps_cmd = ['/o {', 'gsave', 'newpath', 'translate'] # dont want the translate to be global
lw = gc.get_linewidth()
stroke = lw != 0.0
if stroke:
ps_cmd.append('%.1f setlinewidth' % lw)
jint = gc.get_joinstyle()
ps_cmd.append('%d setlinejoin' % jint)
cint = gc.get_capstyle()
ps_cmd.append('%d setlinecap' % cint)
ps_cmd.append(self._convert_path(marker_path, marker_trans,
simplify=False))
if rgbFace:
if stroke:
ps_cmd.append('gsave')
ps_cmd.extend([ps_color, 'fill'])
if stroke:
ps_cmd.append('grestore')
if stroke:
ps_cmd.append('stroke')
ps_cmd.extend(['grestore', '} bind def'])
for vertices, code in path.iter_segments(
trans,
clip=(0, 0, self.width*72, self.height*72),
simplify=False):
if len(vertices):
x, y = vertices[-2:]
ps_cmd.append("%g %g o" % (x, y))
ps = '\n'.join(ps_cmd)
self._draw_ps(ps, gc, rgbFace, fill=False, stroke=False)
def draw_path_collection(self, gc, master_transform, paths, all_transforms,
offsets, offsetTrans, facecolors, edgecolors,
linewidths, linestyles, antialiaseds, urls,
offset_position):
# Is the optimization worth it? Rough calculation:
# cost of emitting a path in-line is
# (len_path + 2) * uses_per_path
# cost of definition+use is
# (len_path + 3) + 3 * uses_per_path
len_path = len(paths[0].vertices) if len(paths) > 0 else 0
uses_per_path = self._iter_collection_uses_per_path(
paths, all_transforms, offsets, facecolors, edgecolors)
should_do_optimization = \
len_path + 3 * uses_per_path + 3 < (len_path + 2) * uses_per_path
if not should_do_optimization:
return RendererBase.draw_path_collection(
self, gc, master_transform, paths, all_transforms,
offsets, offsetTrans, facecolors, edgecolors,
linewidths, linestyles, antialiaseds, urls,
offset_position)
write = self._pswriter.write
path_codes = []
for i, (path, transform) in enumerate(self._iter_collection_raw_paths(
master_transform, paths, all_transforms)):
name = 'p%x_%x' % (self._path_collection_id, i)
ps_cmd = ['/%s {' % name,
'newpath', 'translate']
ps_cmd.append(self._convert_path(path, transform, simplify=False))
ps_cmd.extend(['} bind def\n'])
write('\n'.join(ps_cmd))
path_codes.append(name)
for xo, yo, path_id, gc0, rgbFace in self._iter_collection(
gc, master_transform, all_transforms, path_codes, offsets,
offsetTrans, facecolors, edgecolors, linewidths, linestyles,
antialiaseds, urls, offset_position):
ps = "%g %g %s" % (xo, yo, path_id)
self._draw_ps(ps, gc0, rgbFace)
self._path_collection_id += 1
def draw_tex(self, gc, x, y, s, prop, angle, ismath='TeX!', mtext=None):
"""
draw a Text instance
"""
w, h, bl = self.get_text_width_height_descent(s, prop, ismath)
fontsize = prop.get_size_in_points()
thetext = 'psmarker%d' % self.textcnt
color = '%1.3f,%1.3f,%1.3f'% gc.get_rgb()[:3]
fontcmd = {'sans-serif' : r'{\sffamily %s}',
'monospace' : r'{\ttfamily %s}'}.get(
rcParams['font.family'][0], r'{\rmfamily %s}')
s = fontcmd % s
tex = r'\color[rgb]{%s} %s' % (color, s)
corr = 0#w/2*(fontsize-10)/10
if rcParams['text.latex.preview']:
# use baseline alignment!
pos = _nums_to_str(x-corr, y)
self.psfrag.append(r'\psfrag{%s}[Bl][Bl][1][%f]{\fontsize{%f}{%f}%s}'%(thetext, angle, fontsize, fontsize*1.25, tex))
else:
# stick to the bottom alignment, but this may give incorrect baseline some times.
pos = _nums_to_str(x-corr, y-bl)
self.psfrag.append(r'\psfrag{%s}[bl][bl][1][%f]{\fontsize{%f}{%f}%s}'%(thetext, angle, fontsize, fontsize*1.25, tex))
ps = """\
gsave
%(pos)s moveto
(%(thetext)s)
show
grestore
""" % locals()
self._pswriter.write(ps)
self.textcnt += 1
def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
"""
draw a Text instance
"""
# local to avoid repeated attribute lookups
write = self._pswriter.write
if debugPS:
write("% text\n")
if ismath=='TeX':
return self.tex(gc, x, y, s, prop, angle)
elif ismath:
return self.draw_mathtext(gc, x, y, s, prop, angle)
elif rcParams['ps.useafm']:
self.set_color(*gc.get_rgb())
font = self._get_font_afm(prop)
fontname = font.get_fontname()
fontsize = prop.get_size_in_points()
scale = 0.001*fontsize
thisx = 0
thisy = font.get_str_bbox_and_descent(s)[4] * scale
last_name = None
lines = []
for c in s:
name = uni2type1.get(ord(c), 'question')
try:
width = font.get_width_from_char_name(name)
except KeyError:
name = 'question'
width = font.get_width_char('?')
if last_name is not None:
kern = font.get_kern_dist_from_name(last_name, name)
else:
kern = 0
last_name = name
thisx += kern * scale
lines.append('%f %f m /%s glyphshow'%(thisx, thisy, name))
thisx += width * scale
thetext = "\n".join(lines)
ps = """\
gsave
/%(fontname)s findfont
%(fontsize)s scalefont
setfont
%(x)f %(y)f translate
%(angle)f rotate
%(thetext)s
grestore
""" % locals()
self._pswriter.write(ps)
else:
font = self._get_font_ttf(prop)
font.set_text(s, 0, flags=LOAD_NO_HINTING)
self.track_characters(font, s)
self.set_color(*gc.get_rgb())
sfnt = font.get_sfnt()
try:
ps_name = sfnt[(1,0,0,6)].decode('macroman')
except KeyError:
ps_name = sfnt[(3,1,0x0409,6)].decode(
'utf-16be')
ps_name = ps_name.encode('ascii', 'replace').decode('ascii')
self.set_font(ps_name, prop.get_size_in_points())
lastgind = None
#print 'text', s
lines = []
thisx = 0
thisy = 0
for c in s:
ccode = ord(c)
gind = font.get_char_index(ccode)
if gind is None:
ccode = ord('?')
name = '.notdef'
gind = 0
else:
name = font.get_glyph_name(gind)
glyph = font.load_char(ccode, flags=LOAD_NO_HINTING)
if lastgind is not None:
kern = font.get_kerning(lastgind, gind, KERNING_DEFAULT)
else:
kern = 0
lastgind = gind
thisx += kern/64.0
lines.append('%f %f m /%s glyphshow'%(thisx, thisy, name))
thisx += glyph.linearHoriAdvance/65536.0
thetext = '\n'.join(lines)
ps = """gsave
%(x)f %(y)f translate
%(angle)f rotate
%(thetext)s
grestore
""" % locals()
self._pswriter.write(ps)
def new_gc(self):
return GraphicsContextPS()
def draw_mathtext(self, gc,
x, y, s, prop, angle):
"""
Draw the math text using matplotlib.mathtext
"""
if debugPS:
self._pswriter.write("% mathtext\n")
width, height, descent, pswriter, used_characters = \
self.mathtext_parser.parse(s, 72, prop)
self.merge_used_characters(used_characters)
self.set_color(*gc.get_rgb())
thetext = pswriter.getvalue()
ps = """gsave
%(x)f %(y)f translate
%(angle)f rotate
%(thetext)s
grestore
""" % locals()
self._pswriter.write(ps)
def draw_gouraud_triangle(self, gc, points, colors, trans):
self.draw_gouraud_triangles(gc, points.reshape((1, 3, 2)),
colors.reshape((1, 3, 4)), trans)
def draw_gouraud_triangles(self, gc, points, colors, trans):
assert len(points) == len(colors)
assert points.ndim == 3
assert points.shape[1] == 3
assert points.shape[2] == 2
assert colors.ndim == 3
assert colors.shape[1] == 3
assert colors.shape[2] == 4
shape = points.shape
flat_points = points.reshape((shape[0] * shape[1], 2))
flat_points = trans.transform(flat_points)
flat_colors = colors.reshape((shape[0] * shape[1], 4))
points_min = np.min(flat_points, axis=0) - (1 << 12)
points_max = np.max(flat_points, axis=0) + (1 << 12)
factor = np.ceil(float(2 ** 32 - 1) / (points_max - points_min))
xmin, ymin = points_min
xmax, ymax = points_max
streamarr = np.empty(
(shape[0] * shape[1],),
dtype=[('flags', 'u1'),
('points', '>u4', (2,)),
('colors', 'u1', (3,))])
streamarr['flags'] = 0
streamarr['points'] = (flat_points - points_min) * factor
streamarr['colors'] = flat_colors[:, :3] * 255.0
stream = quote_ps_string(streamarr.tostring())
self._pswriter.write("""
gsave
<< /ShadingType 4
/ColorSpace [/DeviceRGB]
/BitsPerCoordinate 32
/BitsPerComponent 8
/BitsPerFlag 8
/AntiAlias true
/Decode [ %(xmin)f %(xmax)f %(ymin)f %(ymax)f 0 1 0 1 0 1 ]
/DataSource (%(stream)s)
>>
shfill
grestore
""" % locals())
def _draw_ps(self, ps, gc, rgbFace, fill=True, stroke=True, command=None):
"""
Emit the PostScript sniplet 'ps' with all the attributes from 'gc'
applied. 'ps' must consist of PostScript commands to construct a path.
The fill and/or stroke kwargs can be set to False if the
'ps' string already includes filling and/or stroking, in
which case _draw_ps is just supplying properties and
clipping.
"""
# local variable eliminates all repeated attribute lookups
write = self._pswriter.write
if debugPS and command:
write("% "+command+"\n")
mightstroke = gc.shouldstroke()
stroke = stroke and mightstroke
fill = (fill and rgbFace is not None and
(len(rgbFace) <= 3 or rgbFace[3] != 0.0))
hatch = gc.get_hatch()
if mightstroke:
self.set_linewidth(gc.get_linewidth())
jint = gc.get_joinstyle()
self.set_linejoin(jint)
cint = gc.get_capstyle()
self.set_linecap(cint)
self.set_linedash(*gc.get_dashes())
self.set_color(*gc.get_rgb()[:3])
write('gsave\n')
cliprect = gc.get_clip_rectangle()
if cliprect:
x,y,w,h=cliprect.bounds
write('%1.4g %1.4g %1.4g %1.4g clipbox\n' % (w,h,x,y))
clippath, clippath_trans = gc.get_clip_path()
if clippath:
id = self._get_clip_path(clippath, clippath_trans)
write('%s\n' % id)
# Jochen, is the strip necessary? - this could be a honking big string
write(ps.strip())
write("\n")
if fill:
if stroke or hatch:
write("gsave\n")
self.set_color(store=0, *rgbFace[:3])
write("fill\n")
if stroke or hatch:
write("grestore\n")
if hatch:
hatch_name = self.create_hatch(hatch)
write("gsave\n")
write("%f %f %f " % gc.get_hatch_color()[:3])
write("%s setpattern fill grestore\n" % hatch_name)
if stroke:
write("stroke\n")
write("grestore\n")
class GraphicsContextPS(GraphicsContextBase):
def get_capstyle(self):
return {'butt':0,
'round':1,
'projecting':2}[GraphicsContextBase.get_capstyle(self)]
def get_joinstyle(self):
return {'miter':0,
'round':1,
'bevel':2}[GraphicsContextBase.get_joinstyle(self)]
def shouldstroke(self):
return (self.get_linewidth() > 0.0 and
(len(self.get_rgb()) <= 3 or self.get_rgb()[3] != 0.0))
def new_figure_manager(num, *args, **kwargs):
FigureClass = kwargs.pop('FigureClass', Figure)
thisFig = FigureClass(*args, **kwargs)
return new_figure_manager_given_figure(num, thisFig)
def new_figure_manager_given_figure(num, figure):
"""
Create a new figure manager instance for the given figure.
"""
canvas = FigureCanvasPS(figure)
manager = FigureManagerPS(canvas, num)
return manager
class FigureCanvasPS(FigureCanvasBase):
_renderer_class = RendererPS
fixed_dpi = 72
def draw(self):
pass
filetypes = {'ps' : 'Postscript',
'eps' : 'Encapsulated Postscript'}
def get_default_filetype(self):
return 'ps'
def print_ps(self, outfile, *args, **kwargs):
return self._print_ps(outfile, 'ps', *args, **kwargs)
def print_eps(self, outfile, *args, **kwargs):
return self._print_ps(outfile, 'eps', *args, **kwargs)
def _print_ps(self, outfile, format, *args, **kwargs):
papertype = kwargs.pop("papertype", rcParams['ps.papersize'])
papertype = papertype.lower()
if papertype == 'auto':
pass
elif papertype not in papersize:
raise RuntimeError('%s is not a valid papertype. Use one of %s' %
(papertype, ', '.join(papersize)))
orientation = kwargs.pop("orientation", "portrait").lower()
if orientation == 'landscape': isLandscape = True
elif orientation == 'portrait': isLandscape = False
else: raise RuntimeError('Orientation must be "portrait" or "landscape"')
self.figure.set_dpi(72) # Override the dpi kwarg
imagedpi = kwargs.pop("dpi", 72)
facecolor = kwargs.pop("facecolor", "w")
edgecolor = kwargs.pop("edgecolor", "w")
if rcParams['text.usetex']:
self._print_figure_tex(outfile, format, imagedpi, facecolor, edgecolor,
orientation, isLandscape, papertype,
**kwargs)
else:
self._print_figure(outfile, format, imagedpi, facecolor, edgecolor,
orientation, isLandscape, papertype,
**kwargs)
def _print_figure(self, outfile, format, dpi=72, facecolor='w', edgecolor='w',
orientation='portrait', isLandscape=False, papertype=None,
metadata=None, **kwargs):
"""
Render the figure to hardcopy. Set the figure patch face and
edge colors. This is useful because some of the GUIs have a
gray figure face color background and you'll probably want to
override this on hardcopy
If outfile is a string, it is interpreted as a file name.
If the extension matches .ep* write encapsulated postscript,
otherwise write a stand-alone PostScript file.
If outfile is a file object, a stand-alone PostScript file is
written into this file object.
metadata must be a dictionary. Currently, only the value for
the key 'Creator' is used.
"""
isEPSF = format == 'eps'
passed_in_file_object = False
if is_string_like(outfile):
title = outfile
elif is_writable_file_like(outfile):
title = None
passed_in_file_object = True
else:
raise ValueError("outfile must be a path or a file-like object")
# find the appropriate papertype
width, height = self.figure.get_size_inches()
if papertype == 'auto':
if isLandscape: papertype = _get_papertype(height, width)
else: papertype = _get_papertype(width, height)