matplotlib/lib/matplotlib/backends/backend_ps.py at master · gitj/matplotlib · GitHub

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"""

A PostScript backend, which can produce both PostScript .ps and .eps

"""

# PY3KTODO: Get rid of "print >>fh" syntax

from __future__ import division, print_function

import glob, math, os, shutil, sys, time

def _fn_name(): return sys._getframe(1).f_code.co_name

import io

if sys.version_info[0] < 3:

import cStringIO

try:

from hashlib import md5

except ImportError:

from md5 import md5 #Deprecated in 2.5

from tempfile import mkstemp

from matplotlib import verbose, __version__, rcParams

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

from matplotlib.mlab import quad2cubic

from matplotlib.figure import Figure

from matplotlib.font_manager import findfont, is_opentype_cff_font

from matplotlib.ft2font import FT2Font, 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.transforms import Affine2D

from matplotlib.backends.backend_mixed import MixedModeRenderer

import numpy as np

import binascii

import re

try:

set

except NameError:

from sets import Set as set

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

if sys.platform == 'win32': gs_exe = 'gswin32c'

else: 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 subprocess import Popen, PIPE

pipe = Popen(self.gs_exe + " --version",

shell=True, stdout=PIPE).stdout

if sys.version_info[0] >= 3:

ver = pipe.read().decode('ascii')

else:

ver = pipe.read()

gs_version = tuple(map(int, ver.strip().split(".")))

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 = papersize.keys()

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("\\", "\\\\")

s=s.replace("(", "\\(")

s=s.replace(")", "\\)")

s=s.replace("'", "\\251")

s=s.replace("`", "\\301")

s=re.sub(r"[^ -~\n]", lambda x: r"\%03o"%ord(x.group()), s)

return s

def seq_allequal(seq1, seq2):

"""

seq1 and seq2 are either None or sequences or arrays

Return True if both are None or both are seqs with identical

elements

"""

if seq1 is None:

return seq2 is None

if seq2 is None:

return False

#ok, neither are None:, assuming iterable

if len(seq1) != len(seq2): return False

return np.alltrue(np.equal(seq1, seq2))

class RendererPS(RendererBase):

"""

The renderer handles all the drawing primitives using a graphics

context instance that controls the colors/styles.

"""

fontd = maxdict(50)

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 other.iteritems():

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):

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 seq_allequal(seq, oldseq): 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)

self._pswriter.write("""\

<< /PatternType 1

/PaintType 2

/TilingType 2

/BBox[0 0 %(sidelen)d %(sidelen)d]

/XStep %(sidelen)d

/YStep %(sidelen)d

/PaintProc {

pop

0 setlinewidth

""" % locals())

self._pswriter.write(

self._convert_path(Path.hatch(hatch), Affine2D().scale(72.0),

simplify=False))

self._pswriter.write("""\

stroke

} bind

matrix

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, self.height

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 open(fname, 'rb') as fh:

font = AFM(fh)

self.afmfontd[fname] = font

self.afmfontd[key] = font

return font

def _get_font_ttf(self, prop):

key = hash(prop)

font = self.fontd.get(key)

if font is None:

fname = findfont(prop)

font = self.fontd.get(fname)

if font is None:

font = FT2Font(str(fname))

self.fontd[fname] = font

self.fontd[key] = font

font.clear()

size = prop.get_size_in_points()

font.set_size(size, 72.0)

return font

def _rgba(self, im):

return im.as_rgba_str()

def _rgb(self, im):

h,w,s = im.as_rgba_str()

rgba = np.fromstring(s, np.uint8)

rgba.shape = (h, w, 4)

rgb = rgba[:,:,:3]

return h, w, rgb.tostring()

def _gray(self, im, rc=0.3, gc=0.59, bc=0.11):

rgbat = im.as_rgba_str()

rgba = np.fromstring(rgbat[2], np.uint8)

rgba.shape = (rgbat[0], rgbat[1], 4)

rgba_f = rgba.astype(np.float32)

r = rgba_f[:,:,0]

g = rgba_f[:,:,1]

b = rgba_f[:,:,2]

gray = (r*rc + g*gc + b*bc).astype(np.uint8)

return rgbat[0], rgbat[1], gray.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 _get_image_h_w_bits_command(self, im):

if im.is_grayscale:

h, w, bits = self._gray(im)

imagecmd = "image"

else:

h, w, bits = self._rgb(im)

imagecmd = "false 3 colorimage"

return h, w, bits, imagecmd

def draw_image(self, gc, x, y, im, dx=None, dy=None, 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

dx, dy is the width and height of the image. If a transform

(which must be an affine transform) is given, x, y, dx, dy are

interpreted as the coordinate of the transform.

"""

im.flipud_out()

h, w, bits, imagecmd = self._get_image_h_w_bits_command(im)

hexlines = '\n'.join(self._hex_lines(bits))

if dx is None:

xscale = w / self.image_magnification

else:

xscale = dx

if dy is None:

yscale = h/self.image_magnification

else:

yscale = dy

if transform is None:

matrix = "1 0 0 1 0 0"

else:

matrix = " ".join(map(str, transform.to_values()))

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

[%(matrix)s] concat

%(x)s %(y)s translate

%(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)

# unflip

im.flipud_out()

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

for points, code in path.iter_segments(transform, clip=clip,

simplify=simplify):

if code == Path.MOVETO:

ps.append("%g %g m" % tuple(points))

elif code == Path.CLOSEPOLY:

ps.append("cl")

elif last_points is None:

# The other operations require a previous point

raise ValueError('Path lacks initial MOVETO')

elif code == Path.LINETO:

ps.append("%g %g l" % tuple(points))

elif code == Path.CURVE3:

points = quad2cubic(*(list(last_points[-2:]) + list(points)))

ps.append("%g %g %g %g %g %g c" %

tuple(points[2:]))

elif code == Path.CURVE4:

ps.append("%g %g %g %g %g %g c" % tuple(points))

last_points = points

ps = "\n".join(ps)

return ps

def _get_clip_path(self, clippath, clippath_transform):

id = self._clip_paths.get((clippath, clippath_transform))

if id is None:

id = 'c%x' % len(self._clip_paths)

ps_cmd = ['/%s {' % id]

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[(clippath, clippath_transform)] = id

return id

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

# 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, 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):

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!'):

"""

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'], 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+bl)

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)

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):

"""

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())

self.set_font(font.get_sfnt()[(1,0,0,6)], prop.get_size_in_points())

cmap = font.get_charmap()

lastgind = None

#print 'text', s

lines = []

thisx = 0

thisy = font.get_descent() / 64.0

for c in s:

ccode = ord(c)

gind = cmap.get(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

points = trans.transform(points)

shape = points.shape

flat_points = points.reshape((shape[0] * shape[1], 2))

flat_colors = colors.reshape((shape[0] * shape[1], 4))

points_min = np.min(flat_points, axis=0) - (1 << 8)

points_max = np.max(flat_points, axis=0) + (1 << 8)

factor = float(0xffffffff) / (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))

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:

write("gsave\n")

self.set_color(store=0, *rgbFace[:3])

write("fill\n")

if stroke:

write("grestore\n")

hatch = gc.get_hatch()

if hatch:

hatch_name = self.create_hatch(hatch)

write("gsave\n")

write("[/Pattern [/DeviceRGB]] setcolorspace %f %f %f " % gc.get_rgb()[:3])

write("%s setcolor 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

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.iterkeys() )) )

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']:

View remainder of file in raw view

matplotlib/lib/matplotlib/backends/backend_ps.py at master · gitj/matplotlib · GitHub

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