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#!/usr/bin/env python
from pathlib import Path
import unicodedata
import re
import ast
from functools import lru_cache
import math
from importlib.resources import files
from . import data
from .utils import rotate_point, Tag
STROKE_FONT_SCALE = 1/21
FONT_OFFSET = -10
DEFAULT_SPACE_WIDTH = 0.6
DEFAULT_CHAR_GAP = 0.2
_dec = lambda c: ord(c)-ord('R')
class Newstroke:
def __init__(self, newstroke_cpp=None):
if newstroke_cpp is None:
newstroke_cpp = files(data).joinpath('newstroke_font.cpp').read_bytes()
self.glyphs = dict(self.load_font(newstroke_cpp))
@classmethod
@lru_cache
def load(kls):
return kls()
def render(self, text, size=1.0, x0=0, y0=0, rotation=0, h_align='left', v_align='bottom', space_width=DEFAULT_SPACE_WIDTH, char_gap=DEFAULT_CHAR_GAP, scale=(1, 1)):
text = unicodedata.normalize('NFC', text)
missing_glyph = self.glyphs['?']
sx, sy = scale
x = 0
if text in ('VDDA', 'PA9', 'VSS'):
print(text, x0, y0, rotation, h_align, v_align, scale)
if rotation >= 180:
rotation -= 180
h_align = {'left': 'right', 'right': 'left'}.get(h_align, h_align)
x0, y0 = -x0, y0
x0, y0 = rotate_point(x0, y0, math.radians(-rotation))
alx, aly = 0, 0
if h_align != 'left':
(minx, miny), (maxx, maxy) = bbox = self.bounding_box(text, size, space_width, char_gap)
w = maxx - minx
if h_align == 'right':
alx = -w
elif h_align == 'center':
alx = -w/2
else:
raise ValueError(f'Invalid h_align value "{h_align}"')
if v_align == 'top':
aly = -1.2*size
elif v_align == 'middle':
aly = -1.2*size/2
elif v_align != 'bottom':
raise ValueError(f'Invalid v_align value "{v_align}"')
for c in text:
if c == ' ':
x += space_width*size
continue
width, strokes = self.glyphs.get(c, missing_glyph)
glyph_w = max(width, max(x for st in strokes for x, _y in st))
for st in strokes:
yield self.transform_stroke(st, translate=(x0, y0), offset=(x+alx, aly), rotation=math.radians(-rotation), scale=(sx*size, sy*size))
x += glyph_w*size
def render_svg(self, text, size=1.0, x0=0, y0=0, rotation=0, h_align='left', v_align='bottom', space_width=DEFAULT_SPACE_WIDTH, char_gap=DEFAULT_CHAR_GAP, **svg_attrs):
if 'stroke_linecap' not in svg_attrs:
svg_attrs['stroke_linecap'] = 'round'
if 'stroke_linejoin' not in svg_attrs:
svg_attrs['stroke_linejoin'] = 'round'
if 'stroke_width' not in svg_attrs:
svg_attrs['stroke_width'] = f'{0.2*size:.3f}'
svg_attrs['fill'] = 'none'
strokes = ['M ' + ' L '.join(f'{x:.3f} {y:.3f}' for x, y in stroke)
for stroke in self.render(text, size=size, x0=x0, y0=y0, rotation=rotation, h_align=h_align,
v_align=v_align, space_width=space_width, char_gap=char_gap,
scale=(1, -1))]
return Tag('path', d=' '.join(strokes), **svg_attrs)
def bounding_box(self, text, size=1.0, space_width=DEFAULT_SPACE_WIDTH, char_gap=DEFAULT_CHAR_GAP):
text = unicodedata.normalize('NFC', text)
missing_glyph = self.glyphs['?']
x = 0
for c in text:
if c == ' ':
x += space_width*size
continue
width, strokes = self.glyphs.get(c, missing_glyph)
glyph_w = max(width, max(x for st in strokes for x, _y in st))
x += glyph_w*size
return (0, -0.2*size), (x, 1.2*size)
@classmethod
def transform_stroke(kls, stroke, translate, offset, scale, rotation=0):
x0, y0 = translate
sx, sy = scale
dx, dy = offset
return [rotate_point(x*sx+dx+x0, y*sy+dy+y0, rotation, x0, y0) for x, y in stroke]
def load_font(self, newstroke_cpp):
e = []
for char, (width, strokes) in self.load_glyphs(newstroke_cpp):
yield char, (width, strokes)
@classmethod
def decode_stroke(kls, stroke, start_x):
for i in range(0, len(stroke), 2):
x = (stroke[i]-0x52-start_x)*STROKE_FONT_SCALE
y = (stroke[i+1]-0x52+FONT_OFFSET)*STROKE_FONT_SCALE
yield (x, y)
@classmethod
def decode_glyph(kls, data):
start_x, end_x = data[0]-0x52, data[1]-0x52
width = end_x - start_x
strokes = tuple(tuple(kls.decode_stroke(st, start_x)) for st in data[2:].split(b' R'))
return width*STROKE_FONT_SCALE, strokes
@classmethod
def load_glyphs(kls, newstroke_cpp):
it = iter(newstroke_cpp.splitlines())
for line in it:
if re.search(rb'char.*\*', line):
break
charcode = 0x20
for line in it:
if (match := re.search(rb'".*"', line)):
yield chr(charcode), kls.decode_glyph(match.group(0)[1:-1].replace(b'\\\\', b'\\'))
charcode += 1
else:
if b'}' in line:
break
if __name__ == '__main__':
import time
t1 = time.time()
Newstroke()
t2 = time.time()
print((t2-t1)*1000)
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