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name : textpath.py
 # -*- coding: utf-8 -*-

from __future__ import print_function

import urllib
from matplotlib.path import Path
import matplotlib.font_manager as font_manager

from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, LOAD_NO_HINTING, LOAD_TARGET_LIGHT

from matplotlib.mathtext import MathTextParser

import matplotlib.dviread as dviread

import numpy as np

import warnings

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 = FT2Font(str(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.
        """
        ps_name = font.get_sfnt()[(1,0,0,6)]
        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.math.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 usetex==False:
            if ismath == False:
                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.

        cmap = font.get_charmap()
        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 = cmap.get(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 not char_id 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 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 glyph_map is None:
            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 not char_id 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 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)
        try:
            page = next(iter(dvi))
        finally:
            dvi.close()


        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 = FT2Font(str(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 not char_id 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 zip(glyph_ids, xpositions, ypositions, sizes), \
               glyph_map_new, myrects






from matplotlib.font_manager import FontProperties
from matplotlib import rcParams
from matplotlib.transforms import Affine2D

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
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