matplotlib/lib/matplotlib/textpath.py at master · flothesof/matplotlib · GitHub

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# -*- coding: utf-8 -*-

from __future__ import (absolute_import, division, print_function,

unicode_literals)

from matplotlib.externals import six

from matplotlib.externals.six.moves import zip

import warnings

import numpy as np

from matplotlib.path import Path

from matplotlib import rcParams

import matplotlib.font_manager as font_manager

from matplotlib.ft2font import KERNING_DEFAULT, LOAD_NO_HINTING

from matplotlib.ft2font import LOAD_TARGET_LIGHT

from matplotlib.mathtext import MathTextParser

import matplotlib.dviread as dviread

from matplotlib.font_manager import FontProperties, get_font

from matplotlib.transforms import Affine2D

from matplotlib.externals.six.moves.urllib.parse import quote as urllib_quote

class TextToPath(object):

"""

A class that convert a given text to a path using ttf fonts.

"""

FONT_SCALE = 100.

DPI = 72

def __init__(self):

"""

Initialization

"""

self.mathtext_parser = MathTextParser('path')

self.tex_font_map = None

from matplotlib.cbook import maxdict

self._ps_fontd = maxdict(50)

self._texmanager = None

self._adobe_standard_encoding = None

def _get_adobe_standard_encoding(self):

enc_name = dviread.find_tex_file('8a.enc')

enc = dviread.Encoding(enc_name)

return dict([(c, i) for i, c in enumerate(enc.encoding)])

def _get_font(self, prop):

"""

find a ttf font.

"""

fname = font_manager.findfont(prop)

font = get_font(fname)

font.set_size(self.FONT_SCALE, self.DPI)

return font

def _get_hinting_flag(self):

return LOAD_NO_HINTING

def _get_char_id(self, font, ccode):

"""

Return a unique id for the given font and character-code set.

"""

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')

char_id = urllib_quote('%s-%x' % (ps_name, ccode))

return char_id

def _get_char_id_ps(self, font, ccode):

"""

Return a unique id for the given font and character-code set (for tex).

"""

ps_name = font.get_ps_font_info()[2]

char_id = urllib_quote('%s-%d' % (ps_name, ccode))

return char_id

def glyph_to_path(self, font, currx=0.):

"""

convert the ft2font glyph to vertices and codes.

"""

verts, codes = font.get_path()

if currx != 0.0:

verts[:, 0] += currx

return verts, codes

def get_text_width_height_descent(self, s, prop, ismath):

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=None)

return w, h, d

fontsize = prop.get_size_in_points()

scale = float(fontsize) / self.FONT_SCALE

if ismath:

prop = prop.copy()

prop.set_size(self.FONT_SCALE)

width, height, descent, trash, used_characters = \

self.mathtext_parser.parse(s, 72, prop)

return width * scale, height * scale, descent * scale

font = self._get_font(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

return w * scale, h * scale, d * scale

def get_text_path(self, prop, s, ismath=False, usetex=False):

"""

convert text *s* to path (a tuple of vertices and codes for

matplotlib.path.Path).

*prop*

font property

*s*

text to be converted

*usetex*

If True, use matplotlib usetex mode.

*ismath*

If True, use mathtext parser. Effective only if usetex == False.

"""

if not usetex:

if not ismath:

font = self._get_font(prop)

glyph_info, glyph_map, rects = self.get_glyphs_with_font(

font, s)

else:

glyph_info, glyph_map, rects = self.get_glyphs_mathtext(

prop, s)

else:

glyph_info, glyph_map, rects = self.get_glyphs_tex(prop, s)

verts, codes = [], []

for glyph_id, xposition, yposition, scale in glyph_info:

verts1, codes1 = glyph_map[glyph_id]

if len(verts1):

verts1 = np.array(verts1) * scale + [xposition, yposition]

verts.extend(verts1)

codes.extend(codes1)

for verts1, codes1 in rects:

verts.extend(verts1)

codes.extend(codes1)

return verts, codes

def get_glyphs_with_font(self, font, s, glyph_map=None,

return_new_glyphs_only=False):

"""

convert the string *s* to vertices and codes using the

provided ttf font.

"""

# Mostly copied from backend_svg.py.

lastgind = None

currx = 0

xpositions = []

glyph_ids = []

if glyph_map is None:

glyph_map = dict()

if return_new_glyphs_only:

glyph_map_new = dict()

else:

glyph_map_new = glyph_map

# I'm not sure if I get kernings right. Needs to be verified. -JJL

for c in s:

ccode = ord(c)

gind = font.get_char_index(ccode)

if gind is None:

ccode = ord('?')

gind = 0

if lastgind is not None:

kern = font.get_kerning(lastgind, gind, KERNING_DEFAULT)

else:

kern = 0

glyph = font.load_char(ccode, flags=LOAD_NO_HINTING)

horiz_advance = (glyph.linearHoriAdvance / 65536.0)

char_id = self._get_char_id(font, ccode)

if char_id not in glyph_map:

glyph_map_new[char_id] = self.glyph_to_path(font)

currx += (kern / 64.0)

xpositions.append(currx)

glyph_ids.append(char_id)

currx += horiz_advance

lastgind = gind

ypositions = [0] * len(xpositions)

sizes = [1.] * len(xpositions)

rects = []

return (list(zip(glyph_ids, xpositions, ypositions, sizes)),

glyph_map_new, rects)

def get_glyphs_mathtext(self, prop, s, glyph_map=None,

return_new_glyphs_only=False):

"""

convert the string *s* to vertices and codes by parsing it with

mathtext.

"""

prop = prop.copy()

prop.set_size(self.FONT_SCALE)

width, height, descent, glyphs, rects = self.mathtext_parser.parse(

s, self.DPI, prop)

if not glyph_map:

glyph_map = dict()

if return_new_glyphs_only:

glyph_map_new = dict()

else:

glyph_map_new = glyph_map

xpositions = []

ypositions = []

glyph_ids = []

sizes = []

currx, curry = 0, 0

for font, fontsize, ccode, ox, oy in glyphs:

char_id = self._get_char_id(font, ccode)

if char_id not in glyph_map:

font.clear()

font.set_size(self.FONT_SCALE, self.DPI)

glyph = font.load_char(ccode, flags=LOAD_NO_HINTING)

glyph_map_new[char_id] = self.glyph_to_path(font)

xpositions.append(ox)

ypositions.append(oy)

glyph_ids.append(char_id)

size = fontsize / self.FONT_SCALE

sizes.append(size)

myrects = []

for ox, oy, w, h in rects:

vert1 = [(ox, oy), (ox, oy + h), (ox + w, oy + h),

(ox + w, oy), (ox, oy), (0, 0)]

code1 = [Path.MOVETO,

Path.LINETO, Path.LINETO, Path.LINETO, Path.LINETO,

Path.CLOSEPOLY]

myrects.append((vert1, code1))

return (list(zip(glyph_ids, xpositions, ypositions, sizes)),

glyph_map_new, myrects)

def get_texmanager(self):

"""

return the :class:`matplotlib.texmanager.TexManager` instance

"""

if self._texmanager is None:

from matplotlib.texmanager import TexManager

self._texmanager = TexManager()

return self._texmanager

def get_glyphs_tex(self, prop, s, glyph_map=None,

return_new_glyphs_only=False):

"""

convert the string *s* to vertices and codes using matplotlib's usetex

mode.

"""

# codes are modstly borrowed from pdf backend.

texmanager = self.get_texmanager()

if self.tex_font_map is None:

self.tex_font_map = dviread.PsfontsMap(

dviread.find_tex_file('pdftex.map'))

if self._adobe_standard_encoding is None:

self._adobe_standard_encoding = self._get_adobe_standard_encoding()

fontsize = prop.get_size_in_points()

if hasattr(texmanager, "get_dvi"):

dvifilelike = texmanager.get_dvi(s, self.FONT_SCALE)

dvi = dviread.DviFromFileLike(dvifilelike, self.DPI)

else:

dvifile = texmanager.make_dvi(s, self.FONT_SCALE)

dvi = dviread.Dvi(dvifile, self.DPI)

with dvi:

page = next(iter(dvi))

if glyph_map is None:

glyph_map = dict()

if return_new_glyphs_only:

glyph_map_new = dict()

else:

glyph_map_new = glyph_map

glyph_ids, xpositions, ypositions, sizes = [], [], [], []

# Gather font information and do some setup for combining

# characters into strings.

# oldfont, seq = None, []

for x1, y1, dvifont, glyph, width in page.text:

font_and_encoding = self._ps_fontd.get(dvifont.texname)

font_bunch = self.tex_font_map[dvifont.texname]

if font_and_encoding is None:

font = get_font(font_bunch.filename)

for charmap_name, charmap_code in [("ADOBE_CUSTOM",

1094992451),

("ADOBE_STANDARD",

1094995778)]:

try:

font.select_charmap(charmap_code)

except ValueError:

pass

else:

break

else:

charmap_name = ""

warnings.warn("No supported encoding in font (%s)." %

font_bunch.filename)

if charmap_name == "ADOBE_STANDARD" and font_bunch.encoding:

enc0 = dviread.Encoding(font_bunch.encoding)

enc = dict([(i, self._adobe_standard_encoding.get(c, None))

for i, c in enumerate(enc0.encoding)])

else:

enc = dict()

self._ps_fontd[dvifont.texname] = font, enc

else:

font, enc = font_and_encoding

ft2font_flag = LOAD_TARGET_LIGHT

char_id = self._get_char_id_ps(font, glyph)

if char_id not in glyph_map:

font.clear()

font.set_size(self.FONT_SCALE, self.DPI)

if enc:

charcode = enc.get(glyph, None)

else:

charcode = glyph

if charcode is not None:

glyph0 = font.load_char(charcode, flags=ft2font_flag)

else:

warnings.warn("The glyph (%d) of font (%s) cannot be "

"converted with the encoding. Glyph may "

"be wrong" % (glyph, font_bunch.filename))

glyph0 = font.load_char(glyph, flags=ft2font_flag)

glyph_map_new[char_id] = self.glyph_to_path(font)

glyph_ids.append(char_id)

xpositions.append(x1)

ypositions.append(y1)

sizes.append(dvifont.size / self.FONT_SCALE)

myrects = []

for ox, oy, h, w in page.boxes:

vert1 = [(ox, oy), (ox + w, oy), (ox + w, oy + h),

(ox, oy + h), (ox, oy), (0, 0)]

code1 = [Path.MOVETO,

Path.LINETO, Path.LINETO, Path.LINETO, Path.LINETO,

Path.CLOSEPOLY]

myrects.append((vert1, code1))

return (list(zip(glyph_ids, xpositions, ypositions, sizes)),

glyph_map_new, myrects)

text_to_path = TextToPath()

class TextPath(Path):

"""

Create a path from the text.

"""

def __init__(self, xy, s, size=None, prop=None,

_interpolation_steps=1, usetex=False,

*kl, **kwargs):

"""

Create a path from the text. No support for TeX yet. Note that

it simply is a path, not an artist. You need to use the

PathPatch (or other artists) to draw this path onto the

canvas.

xy : position of the text.

s : text

size : font size

prop : font property

"""

if prop is None:

prop = FontProperties()

if size is None:

size = prop.get_size_in_points()

self._xy = xy

self.set_size(size)

self._cached_vertices = None

self._vertices, self._codes = self.text_get_vertices_codes(

prop, s,

usetex=usetex)

self._should_simplify = False

self._simplify_threshold = rcParams['path.simplify_threshold']

self._has_nonfinite = False

self._interpolation_steps = _interpolation_steps

def set_size(self, size):

"""

set the size of the text

"""

self._size = size

self._invalid = True

def get_size(self):

"""

get the size of the text

"""

return self._size

def _get_vertices(self):

"""

Return the cached path after updating it if necessary.

"""

self._revalidate_path()

return self._cached_vertices

def _get_codes(self):

"""

Return the codes

"""

return self._codes

vertices = property(_get_vertices)

codes = property(_get_codes)

def _revalidate_path(self):

"""

update the path if necessary.

The path for the text is initially create with the font size

of FONT_SCALE, and this path is rescaled to other size when

necessary.

"""

if (self._invalid or

(self._cached_vertices is None)):

tr = Affine2D().scale(

self._size / text_to_path.FONT_SCALE,

self._size / text_to_path.FONT_SCALE).translate(*self._xy)

self._cached_vertices = tr.transform(self._vertices)

self._invalid = False

def is_math_text(self, s):

"""

Returns True if the given string *s* contains any mathtext.

"""

# copied from Text.is_math_text -JJL

# Did we find an even number of non-escaped dollar signs?

# If so, treat is as math text.

dollar_count = s.count(r'$') - s.count(r'\$')

even_dollars = (dollar_count > 0 and dollar_count % 2 == 0)

if rcParams['text.usetex']:

return s, 'TeX'

if even_dollars:

return s, True

else:

return s.replace(r'\$', '$'), False

def text_get_vertices_codes(self, prop, s, usetex):

"""

convert the string *s* to vertices and codes using the

provided font property *prop*. Mostly copied from

backend_svg.py.

"""

if usetex:

verts, codes = text_to_path.get_text_path(prop, s, usetex=True)

else:

clean_line, ismath = self.is_math_text(s)

verts, codes = text_to_path.get_text_path(prop, clean_line,

ismath=ismath)

return verts, codes

matplotlib/lib/matplotlib/textpath.py at master · flothesof/matplotlib · GitHub

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