/
backend_ps.py
1367 lines (1180 loc) · 47 KB
/
backend_ps.py
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"""
A PostScript backend, which can produce both PostScript .ps and .eps.
"""
import codecs
import datetime
from enum import Enum
import functools
from io import StringIO
import logging
import os
import pathlib
import re
import shutil
from tempfile import TemporaryDirectory
import time
import numpy as np
import matplotlib as mpl
from matplotlib import _api, cbook, _path, _text_helpers
from matplotlib._afm import AFM
from matplotlib.backend_bases import (
_Backend, FigureCanvasBase, FigureManagerBase, RendererBase)
from matplotlib.cbook import is_writable_file_like, file_requires_unicode
from matplotlib.font_manager import get_font
from matplotlib.ft2font import LOAD_NO_SCALE, FT2Font
from matplotlib._ttconv import convert_ttf_to_ps
from matplotlib._mathtext_data import uni2type1
from matplotlib.path import Path
from matplotlib.texmanager import TexManager
from matplotlib.transforms import Affine2D
from matplotlib.backends.backend_mixed import MixedModeRenderer
from . import _backend_pdf_ps
_log = logging.getLogger(__name__)
debugPS = False
class PsBackendHelper:
def __init__(self):
self._cached = {}
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': (2.05, 2.91),
'a9': (1.46, 2.05),
'a10': (1.02, 1.46),
'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):
for key, (pw, ph) in sorted(papersize.items(), reverse=True):
if key.startswith('l'):
continue
if w < pw and h < ph:
return key
return 'a0'
def _nums_to_str(*args):
return " ".join(f"{arg:1.3f}".rstrip("0").rstrip(".") for arg in args)
@_api.deprecated("3.6", alternative="a vendored copy of this function")
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')
def _move_path_to_path_or_stream(src, dst):
"""
Move the contents of file at *src* to path-or-filelike *dst*.
If *dst* is a path, the metadata of *src* are *not* copied.
"""
if is_writable_file_like(dst):
fh = (open(src, 'r', encoding='latin-1')
if file_requires_unicode(dst)
else open(src, 'rb'))
with fh:
shutil.copyfileobj(fh, dst)
else:
shutil.move(src, dst, copy_function=shutil.copyfile)
def _font_to_ps_type3(font_path, chars):
"""
Subset *chars* from the font at *font_path* into a Type 3 font.
Parameters
----------
font_path : path-like
Path to the font to be subsetted.
chars : str
The characters to include in the subsetted font.
Returns
-------
str
The string representation of a Type 3 font, which can be included
verbatim into a PostScript file.
"""
font = get_font(font_path, hinting_factor=1)
glyph_ids = [font.get_char_index(c) for c in chars]
preamble = """\
%!PS-Adobe-3.0 Resource-Font
%%Creator: Converted from TrueType to Type 3 by Matplotlib.
10 dict begin
/FontName /{font_name} def
/PaintType 0 def
/FontMatrix [{inv_units_per_em} 0 0 {inv_units_per_em} 0 0] def
/FontBBox [{bbox}] def
/FontType 3 def
/Encoding [{encoding}] def
/CharStrings {num_glyphs} dict dup begin
/.notdef 0 def
""".format(font_name=font.postscript_name,
inv_units_per_em=1 / font.units_per_EM,
bbox=" ".join(map(str, font.bbox)),
encoding=" ".join("/{}".format(font.get_glyph_name(glyph_id))
for glyph_id in glyph_ids),
num_glyphs=len(glyph_ids) + 1)
postamble = """
end readonly def
/BuildGlyph {
exch begin
CharStrings exch
2 copy known not {pop /.notdef} if
true 3 1 roll get exec
end
} _d
/BuildChar {
1 index /Encoding get exch get
1 index /BuildGlyph get exec
} _d
FontName currentdict end definefont pop
"""
entries = []
for glyph_id in glyph_ids:
g = font.load_glyph(glyph_id, LOAD_NO_SCALE)
v, c = font.get_path()
entries.append(
"/%(name)s{%(bbox)s sc\n" % {
"name": font.get_glyph_name(glyph_id),
"bbox": " ".join(map(str, [g.horiAdvance, 0, *g.bbox])),
}
+ _path.convert_to_string(
# Convert back to TrueType's internal units (1/64's).
# (Other dimensions are already in these units.)
Path(v * 64, c), None, None, False, None, 0,
# No code for quad Beziers triggers auto-conversion to cubics.
# Drop intermediate closepolys (relying on the outline
# decomposer always explicitly moving to the closing point
# first).
[b"m", b"l", b"", b"c", b""], True).decode("ascii")
+ "ce} _d"
)
return preamble + "\n".join(entries) + postamble
def _font_to_ps_type42(font_path, chars, fh):
"""
Subset *chars* from the font at *font_path* into a Type 42 font at *fh*.
Parameters
----------
font_path : path-like
Path to the font to be subsetted.
chars : str
The characters to include in the subsetted font.
fh : file-like
Where to write the font.
"""
subset_str = ''.join(chr(c) for c in chars)
_log.debug("SUBSET %s characters: %s", font_path, subset_str)
try:
fontdata = _backend_pdf_ps.get_glyphs_subset(font_path, subset_str)
_log.debug("SUBSET %s %d -> %d", font_path, os.stat(font_path).st_size,
fontdata.getbuffer().nbytes)
# Give ttconv a subsetted font along with updated glyph_ids.
font = FT2Font(fontdata)
glyph_ids = [font.get_char_index(c) for c in chars]
with TemporaryDirectory() as tmpdir:
tmpfile = os.path.join(tmpdir, "tmp.ttf")
with open(tmpfile, 'wb') as tmp:
tmp.write(fontdata.getvalue())
# TODO: allow convert_ttf_to_ps to input file objects (BytesIO)
convert_ttf_to_ps(os.fsencode(tmpfile), fh, 42, glyph_ids)
except RuntimeError:
_log.warning(
"The PostScript backend does not currently "
"support the selected font.")
raise
def _log_if_debug_on(meth):
"""
Wrap `RendererPS` method *meth* to emit a PS comment with the method name,
if the global flag `debugPS` is set.
"""
@functools.wraps(meth)
def wrapper(self, *args, **kwargs):
if debugPS:
self._pswriter.write(f"% {meth.__name__}\n")
return meth(self, *args, **kwargs)
return wrapper
class RendererPS(_backend_pdf_ps.RendererPDFPSBase):
"""
The renderer handles all the drawing primitives using a graphics
context instance that controls the colors/styles.
"""
_afm_font_dir = cbook._get_data_path("fonts/afm")
_use_afm_rc_name = "ps.useafm"
def __init__(self, width, height, pswriter, imagedpi=72):
# Although postscript itself is dpi independent, we need to inform the
# image code about a requested dpi to generate high resolution images
# and them scale them before embedding them.
super().__init__(width, height)
self._pswriter = pswriter
if mpl.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
self._clip_paths = {}
self._path_collection_id = 0
self._character_tracker = _backend_pdf_ps.CharacterTracker()
self._logwarn_once = functools.lru_cache(None)(_log.warning)
def _is_transparent(self, rgb_or_rgba):
if rgb_or_rgba is None:
return True # Consistent with rgbFace semantics.
elif len(rgb_or_rgba) == 4:
if rgb_or_rgba[3] == 0:
return True
if rgb_or_rgba[3] != 1:
self._logwarn_once(
"The PostScript backend does not support transparency; "
"partially transparent artists will be rendered opaque.")
return False
else: # len() == 3.
return False
def set_color(self, r, g, b, store=True):
if (r, g, b) != self.color:
self._pswriter.write(f"{r:1.3f} setgray\n"
if r == g == b else
f"{r:1.3f} {g:1.3f} {b:1.3f} setrgbcolor\n")
if store:
self.color = (r, g, b)
def set_linewidth(self, linewidth, store=True):
linewidth = float(linewidth)
if linewidth != self.linewidth:
self._pswriter.write("%1.3f setlinewidth\n" % linewidth)
if store:
self.linewidth = linewidth
@staticmethod
def _linejoin_cmd(linejoin):
# Support for directly passing integer values is for backcompat.
linejoin = {'miter': 0, 'round': 1, 'bevel': 2, 0: 0, 1: 1, 2: 2}[
linejoin]
return f"{linejoin:d} setlinejoin\n"
def set_linejoin(self, linejoin, store=True):
if linejoin != self.linejoin:
self._pswriter.write(self._linejoin_cmd(linejoin))
if store:
self.linejoin = linejoin
@staticmethod
def _linecap_cmd(linecap):
# Support for directly passing integer values is for backcompat.
linecap = {'butt': 0, 'round': 1, 'projecting': 2, 0: 0, 1: 1, 2: 2}[
linecap]
return f"{linecap:d} setlinecap\n"
def set_linecap(self, linecap, store=True):
if linecap != self.linecap:
self._pswriter.write(self._linecap_cmd(linecap))
if store:
self.linecap = linecap
def set_linedash(self, offset, seq, store=True):
if self.linedash is not None:
oldo, oldseq = self.linedash
if np.array_equal(seq, oldseq) and oldo == offset:
return
self._pswriter.write(f"[{_nums_to_str(*seq)}]"
f" {_nums_to_str(offset)} setdash\n"
if seq is not None and len(seq) else
"[] 0 setdash\n")
if store:
self.linedash = (offset, seq)
def set_font(self, fontname, fontsize, store=True):
if (fontname, fontsize) != (self.fontname, self.fontsize):
self._pswriter.write(f"/{fontname} {fontsize:1.3f} selectfont\n")
if store:
self.fontname = fontname
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 = mpl.rcParams['hatch.linewidth']
pageheight = self.height * 72
self._pswriter.write(f"""\
<< /PatternType 1
/PaintType 2
/TilingType 2
/BBox[0 0 {sidelen:d} {sidelen:d}]
/XStep {sidelen:d}
/YStep {sidelen:d}
/PaintProc {{
pop
{linewidth:g} setlinewidth
{self._convert_path(
Path.hatch(hatch), Affine2D().scale(sidelen), simplify=False)}
gsave
fill
grestore
stroke
}} bind
>>
matrix
0 {pageheight:g} translate
makepattern
/{name} exch def
""")
self._hatches[hatch] = name
return name
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 _convert_path(self, path, transform, clip=False, simplify=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_cmd(self, gc):
clip = []
rect = gc.get_clip_rectangle()
if rect is not None:
clip.append("%s clipbox\n" % _nums_to_str(*rect.size, *rect.p0))
path, trf = gc.get_clip_path()
if path is not None:
key = (path, id(trf))
custom_clip_cmd = self._clip_paths.get(key)
if custom_clip_cmd is None:
custom_clip_cmd = "c%d" % len(self._clip_paths)
self._pswriter.write(f"""\
/{custom_clip_cmd} {{
{self._convert_path(path, trf, simplify=False)}
clip
newpath
}} bind def
""")
self._clip_paths[key] = custom_clip_cmd
clip.append(f"{custom_clip_cmd}\n")
return "".join(clip)
@_log_if_debug_on
def draw_image(self, gc, x, y, im, transform=None):
# docstring inherited
h, w = im.shape[:2]
imagecmd = "false 3 colorimage"
data = im[::-1, :, :3] # Vertically flipped rgb values.
hexdata = data.tobytes().hex("\n", -64) # Linewrap to 128 chars.
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
self._pswriter.write(f"""\
gsave
{self._get_clip_cmd(gc)}
{x:g} {y:g} translate
[{matrix}] concat
{xscale:g} {yscale:g} scale
/DataString {w:d} string def
{w:d} {h:d} 8 [ {w:d} 0 0 -{h:d} 0 {h:d} ]
{{
currentfile DataString readhexstring pop
}} bind {imagecmd}
{hexdata}
grestore
""")
@_log_if_debug_on
def draw_path(self, gc, path, transform, rgbFace=None):
# docstring inherited
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)
@_log_if_debug_on
def draw_markers(
self, gc, marker_path, marker_trans, path, trans, rgbFace=None):
# docstring inherited
ps_color = (
None
if self._is_transparent(rgbFace)
else '%1.3f setgray' % rgbFace[0]
if rgbFace[0] == rgbFace[1] == rgbFace[2]
else '%1.3f %1.3f %1.3f setrgbcolor' % rgbFace[:3])
# construct the generic marker command:
# don't want the translate to be global
ps_cmd = ['/o {', 'gsave', 'newpath', 'translate']
lw = gc.get_linewidth()
alpha = (gc.get_alpha()
if gc.get_forced_alpha() or len(gc.get_rgb()) == 3
else gc.get_rgb()[3])
stroke = lw > 0 and alpha > 0
if stroke:
ps_cmd.append('%.1f setlinewidth' % lw)
ps_cmd.append(self._linejoin_cmd(gc.get_joinstyle()))
ps_cmd.append(self._linecap_cmd(gc.get_capstyle()))
ps_cmd.append(self._convert_path(marker_path, marker_trans,
simplify=False))
if rgbFace:
if stroke:
ps_cmd.append('gsave')
if ps_color:
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)
@_log_if_debug_on
def draw_path_collection(self, gc, master_transform, paths, all_transforms,
offsets, offset_trans, 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, offset_trans, facecolors, edgecolors,
linewidths, linestyles, antialiaseds, urls,
offset_position)
path_codes = []
for i, (path, transform) in enumerate(self._iter_collection_raw_paths(
master_transform, paths, all_transforms)):
name = 'p%d_%d' % (self._path_collection_id, i)
path_bytes = self._convert_path(path, transform, simplify=False)
self._pswriter.write(f"""\
/{name} {{
newpath
translate
{path_bytes}
}} bind def
""")
path_codes.append(name)
for xo, yo, path_id, gc0, rgbFace in self._iter_collection(
gc, path_codes, offsets, offset_trans,
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
@_log_if_debug_on
def draw_tex(self, gc, x, y, s, prop, angle, *, mtext=None):
# docstring inherited
if self._is_transparent(gc.get_rgb()):
return # Special handling for fully transparent.
if not hasattr(self, "psfrag"):
self._logwarn_once(
"The PS backend determines usetex status solely based on "
"rcParams['text.usetex'] and does not support having "
"usetex=True only for some elements; this element will thus "
"be rendered as if usetex=False.")
self.draw_text(gc, x, y, s, prop, angle, False, mtext)
return
w, h, bl = self.get_text_width_height_descent(s, prop, ismath="TeX")
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(
mpl.rcParams['font.family'][0], r'{\rmfamily %s}')
s = fontcmd % s
tex = r'\color[rgb]{%s} %s' % (color, s)
# Stick to the bottom alignment.
pos = _nums_to_str(x, y-bl)
self.psfrag.append(
r'\psfrag{%s}[bl][bl][1][%f]{\fontsize{%f}{%f}%s}' % (
thetext, angle, fontsize, fontsize*1.25, tex))
self._pswriter.write(f"""\
gsave
{pos} moveto
({thetext})
show
grestore
""")
self.textcnt += 1
@_log_if_debug_on
def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
# docstring inherited
if self._is_transparent(gc.get_rgb()):
return # Special handling for fully transparent.
if ismath == 'TeX':
return self.draw_tex(gc, x, y, s, prop, angle)
if ismath:
return self.draw_mathtext(gc, x, y, s, prop, angle)
if mpl.rcParams['ps.useafm']:
font = self._get_font_afm(prop)
scale = 0.001 * prop.get_size_in_points()
stream = []
thisx = 0
last_name = None # kerns returns 0 for None.
xs_names = []
for c in s:
name = uni2type1.get(ord(c), f"uni{ord(c):04X}")
try:
width = font.get_width_from_char_name(name)
except KeyError:
name = 'question'
width = font.get_width_char('?')
kern = font.get_kern_dist_from_name(last_name, name)
last_name = name
thisx += kern * scale
xs_names.append((thisx, name))
thisx += width * scale
ps_name = (font.postscript_name
.encode("ascii", "replace").decode("ascii"))
stream.append((ps_name, xs_names))
else:
font = self._get_font_ttf(prop)
self._character_tracker.track(font, s)
stream = []
prev_font = curr_stream = None
for item in _text_helpers.layout(s, font):
ps_name = (item.ft_object.postscript_name
.encode("ascii", "replace").decode("ascii"))
if item.ft_object is not prev_font:
if curr_stream:
stream.append(curr_stream)
prev_font = item.ft_object
curr_stream = [ps_name, []]
curr_stream[1].append(
(item.x, item.ft_object.get_glyph_name(item.glyph_idx))
)
# append the last entry if exists
if curr_stream:
stream.append(curr_stream)
self.set_color(*gc.get_rgb())
for ps_name, xs_names in stream:
self.set_font(ps_name, prop.get_size_in_points(), False)
thetext = "\n".join(f"{x:g} 0 m /{name:s} glyphshow"
for x, name in xs_names)
self._pswriter.write(f"""\
gsave
{self._get_clip_cmd(gc)}
{x:g} {y:g} translate
{angle:g} rotate
{thetext}
grestore
""")
@_log_if_debug_on
def draw_mathtext(self, gc, x, y, s, prop, angle):
"""Draw the math text using matplotlib.mathtext."""
width, height, descent, glyphs, rects = \
self._text2path.mathtext_parser.parse(s, 72, prop)
self.set_color(*gc.get_rgb())
self._pswriter.write(
f"gsave\n"
f"{x:g} {y:g} translate\n"
f"{angle:g} rotate\n")
lastfont = None
for font, fontsize, num, ox, oy in glyphs:
self._character_tracker.track_glyph(font, num)
if (font.postscript_name, fontsize) != lastfont:
lastfont = font.postscript_name, fontsize
self._pswriter.write(
f"/{font.postscript_name} {fontsize} selectfont\n")
glyph_name = (
font.get_name_char(chr(num)) if isinstance(font, AFM) else
font.get_glyph_name(font.get_char_index(num)))
self._pswriter.write(
f"{ox:g} {oy:g} moveto\n"
f"/{glyph_name} glyphshow\n")
for ox, oy, w, h in rects:
self._pswriter.write(f"{ox} {oy} {w} {h} rectfill\n")
self._pswriter.write("grestore\n")
@_log_if_debug_on
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)
@_log_if_debug_on
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((2 ** 32 - 1) / (points_max - points_min))
xmin, ymin = points_min
xmax, ymax = points_max
data = np.empty(
shape[0] * shape[1],
dtype=[('flags', 'u1'), ('points', '2>u4'), ('colors', '3u1')])
data['flags'] = 0
data['points'] = (flat_points - points_min) * factor
data['colors'] = flat_colors[:, :3] * 255.0
hexdata = data.tobytes().hex("\n", -64) # Linewrap to 128 chars.
self._pswriter.write(f"""\
gsave
<< /ShadingType 4
/ColorSpace [/DeviceRGB]
/BitsPerCoordinate 32
/BitsPerComponent 8
/BitsPerFlag 8
/AntiAlias true
/Decode [ {xmin:g} {xmax:g} {ymin:g} {ymax:g} 0 1 0 1 0 1 ]
/DataSource <
{hexdata}
>
>>
shfill
grestore
""")
def _draw_ps(self, ps, gc, rgbFace, *, fill=True, stroke=True):
"""
Emit the PostScript snippet *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.
"""
write = self._pswriter.write
mightstroke = (gc.get_linewidth() > 0
and not self._is_transparent(gc.get_rgb()))
if not mightstroke:
stroke = False
if self._is_transparent(rgbFace):
fill = False
hatch = gc.get_hatch()
if mightstroke:
self.set_linewidth(gc.get_linewidth())
self.set_linejoin(gc.get_joinstyle())
self.set_linecap(gc.get_capstyle())
self.set_linedash(*gc.get_dashes())
if mightstroke or hatch:
self.set_color(*gc.get_rgb()[:3])
write('gsave\n')
write(self._get_clip_cmd(gc))
write(ps.strip())
write("\n")
if fill:
if stroke or hatch:
write("gsave\n")
self.set_color(*rgbFace[:3], store=False)
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 _Orientation(Enum):
portrait, landscape = range(2)
def swap_if_landscape(self, shape):
return shape[::-1] if self.name == "landscape" else shape
class FigureCanvasPS(FigureCanvasBase):
fixed_dpi = 72
filetypes = {'ps': 'Postscript',
'eps': 'Encapsulated Postscript'}
def get_default_filetype(self):
return 'ps'
@_api.delete_parameter("3.5", "args")
def _print_ps(
self, fmt, outfile, *args,
metadata=None, papertype=None, orientation='portrait',
**kwargs):
dpi = self.figure.dpi
self.figure.dpi = 72 # Override the dpi kwarg
dsc_comments = {}
if isinstance(outfile, (str, os.PathLike)):
filename = pathlib.Path(outfile).name
dsc_comments["Title"] = \
filename.encode("ascii", "replace").decode("ascii")
dsc_comments["Creator"] = (metadata or {}).get(
"Creator",
f"Matplotlib v{mpl.__version__}, https://matplotlib.org/")
# See https://reproducible-builds.org/specs/source-date-epoch/
source_date_epoch = os.getenv("SOURCE_DATE_EPOCH")
dsc_comments["CreationDate"] = (
datetime.datetime.utcfromtimestamp(
int(source_date_epoch)).strftime("%a %b %d %H:%M:%S %Y")
if source_date_epoch
else time.ctime())
dsc_comments = "\n".join(
f"%%{k}: {v}" for k, v in dsc_comments.items())
if papertype is None:
papertype = mpl.rcParams['ps.papersize']
papertype = papertype.lower()
_api.check_in_list(['auto', *papersize], papertype=papertype)
orientation = _api.check_getitem(
_Orientation, orientation=orientation.lower())
printer = (self._print_figure_tex
if mpl.rcParams['text.usetex'] else
self._print_figure)
printer(fmt, outfile, dpi=dpi, dsc_comments=dsc_comments,
orientation=orientation, papertype=papertype, **kwargs)
def _print_figure(
self, fmt, outfile, *,
dpi, dsc_comments, orientation, papertype,
bbox_inches_restore=None):
"""
Render the figure to a filesystem path or a file-like object.
Parameters are as for `.print_figure`, except that *dsc_comments* is a
all string containing Document Structuring Convention comments,
generated from the *metadata* parameter to `.print_figure`.
"""
is_eps = fmt == 'eps'
if not (isinstance(outfile, (str, os.PathLike))
or is_writable_file_like(outfile)):
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':
papertype = _get_papertype(
*orientation.swap_if_landscape((width, height)))
paper_width, paper_height = orientation.swap_if_landscape(
papersize[papertype])
if mpl.rcParams['ps.usedistiller']:
# distillers improperly clip eps files if pagesize is too small
if width > paper_width or height > paper_height:
papertype = _get_papertype(
*orientation.swap_if_landscape((width, height)))
paper_width, paper_height = orientation.swap_if_landscape(
papersize[papertype])
# center the figure on the paper
xo = 72 * 0.5 * (paper_width - width)
yo = 72 * 0.5 * (paper_height - height)
llx = xo
lly = yo
urx = llx + self.figure.bbox.width
ury = lly + self.figure.bbox.height
rotation = 0
if orientation is _Orientation.landscape:
llx, lly, urx, ury = lly, llx, ury, urx
xo, yo = 72 * paper_height - yo, xo
rotation = 90
bbox = (llx, lly, urx, ury)
self._pswriter = StringIO()
# mixed mode rendering
ps_renderer = RendererPS(width, height, self._pswriter, imagedpi=dpi)
renderer = MixedModeRenderer(
self.figure, width, height, dpi, ps_renderer,
bbox_inches_restore=bbox_inches_restore)
self.figure.draw(renderer)
def print_figure_impl(fh):
# write the PostScript headers
if is_eps:
print("%!PS-Adobe-3.0 EPSF-3.0", file=fh)
else:
print(f"%!PS-Adobe-3.0\n"
f"%%DocumentPaperSizes: {papertype}\n"
f"%%Pages: 1\n",
end="", file=fh)
print(f"{dsc_comments}\n"
f"%%Orientation: {orientation.name}\n"
f"{get_bbox_header(bbox)[0]}\n"
f"%%EndComments\n",
end="", file=fh)
Ndict = len(psDefs)
print("%%BeginProlog", file=fh)
if not mpl.rcParams['ps.useafm']:
Ndict += len(ps_renderer._character_tracker.used)
print("/mpldict %d dict def" % Ndict, file=fh)
print("mpldict begin", file=fh)
print("\n".join(psDefs), file=fh)
if not mpl.rcParams['ps.useafm']:
for font_path, chars \
in ps_renderer._character_tracker.used.items():
if not chars:
continue
fonttype = mpl.rcParams['ps.fonttype']
# Can't use more than 255 chars from a single Type 3 font.
if len(chars) > 255:
fonttype = 42
fh.flush()
if fonttype == 3:
fh.write(_font_to_ps_type3(font_path, chars))
else: # Type 42 only.
_font_to_ps_type42(font_path, chars, fh)
print("end", file=fh)
print("%%EndProlog", file=fh)
if not is_eps:
print("%%Page: 1 1", file=fh)
print("mpldict begin", file=fh)
print("%s translate" % _nums_to_str(xo, yo), file=fh)
if rotation:
print("%d rotate" % rotation, file=fh)
print("%s clipbox" % _nums_to_str(width*72, height*72, 0, 0),
file=fh)
# write the figure
print(self._pswriter.getvalue(), file=fh)
# write the trailer
print("end", file=fh)
print("showpage", file=fh)
if not is_eps:
print("%%EOF", file=fh)
fh.flush()
if mpl.rcParams['ps.usedistiller']:
# We are going to use an external program to process the output.
# Write to a temporary file.
with TemporaryDirectory() as tmpdir:
tmpfile = os.path.join(tmpdir, "tmp.ps")
with open(tmpfile, 'w', encoding='latin-1') as fh:
print_figure_impl(fh)
if mpl.rcParams['ps.usedistiller'] == 'ghostscript':
_try_distill(gs_distill,
tmpfile, is_eps, ptype=papertype, bbox=bbox)
elif mpl.rcParams['ps.usedistiller'] == 'xpdf':
_try_distill(xpdf_distill,
tmpfile, is_eps, ptype=papertype, bbox=bbox)