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text_mobject.py
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text_mobject.py
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import re
import os
import copy
import hashlib
import cairo
import manimlib.constants as consts
from manimlib.constants import *
from manimlib.container.container import Container
from manimlib.mobject.geometry import Dot, Rectangle
from manimlib.mobject.svg.svg_mobject import SVGMobject
from manimlib.mobject.types.vectorized_mobject import VGroup
from manimlib.utils.config_ops import digest_config
TEXT_MOB_SCALE_FACTOR = 0.05
class TextSetting(object):
def __init__(self, start, end, font, slant, weight, line_num=-1):
self.start = start
self.end = end
self.font = font
self.slant = slant
self.weight = weight
self.line_num = line_num
class Text(SVGMobject):
CONFIG = {
# Mobject
'color': consts.WHITE,
'height': None,
'width': None,
'fill_opacity': 1,
'stroke_width': 0,
"should_center": True,
"unpack_groups": True,
# Text
'font': '',
'gradient': None,
'line_spacing': -1,
'size': 1,
'slant': NORMAL,
'weight': NORMAL,
't2c': {},
't2f': {},
't2g': {},
't2s': {},
't2w': {},
'tab_width': 4,
}
def __init__(self, text, **config):
self.full2short(config)
digest_config(self, config)
text_without_tabs = text
if text.find('\t') != -1:
text_without_tabs = text.replace('\t', ' ' * self.tab_width)
self.text = text_without_tabs
self.line_spacing = self.size + self.size * 0.2 if self.line_spacing == -1 else self.line_spacing
file_name = self.text2svg()
self.remove_last_M(file_name)
SVGMobject.__init__(self, file_name, **config)
self.text = text
self.apply_space_chars()
nppc = self.n_points_per_cubic_curve
for each in self:
if len(each.points) == 0:
continue
points = each.points
last = points[0]
each.clear_points()
for index, point in enumerate(points):
each.append_points([point])
if index != len(points) - 1 and (index + 1) % nppc == 0 and any(point != points[index + 1]):
each.add_line_to(last)
last = points[index + 1]
each.add_line_to(last)
if self.t2c:
self.set_color_by_t2c()
if self.gradient:
self.set_color_by_gradient(*self.gradient)
if self.t2g:
self.set_color_by_t2g()
# anti-aliasing
if self.height is None and self.width is None:
self.scale(TEXT_MOB_SCALE_FACTOR)
def apply_space_chars(self):
for char_index in range(self.text.__len__()):
if self.text[char_index] == " " or self.text[char_index] == "\t" or self.text[char_index] == "\n":
space = Dot(redius=0, fill_opacity=0, stroke_opacity=0)
if char_index == 0:
space.move_to(self.submobjects[char_index - 1].get_center())
else:
space.move_to(self.submobjects[char_index - 1].get_center())
self.submobjects.insert(char_index, space)
def remove_last_M(self, file_name):
with open(file_name, 'r') as fpr:
content = fpr.read()
content = re.sub(r'Z M [^A-Za-z]*? "\/>', 'Z "/>', content)
with open(file_name, 'w') as fpw:
fpw.write(content)
def find_indexes(self, word):
m = re.match(r'\[([0-9\-]{0,}):([0-9\-]{0,})\]', word)
if m:
start = int(m.group(1)) if m.group(1) != '' else 0
end = int(m.group(2)) if m.group(2) != '' else len(self.text)
start = len(self.text) + start if start < 0 else start
end = len(self.text) + end if end < 0 else end
return [(start, end)]
indexes = []
index = self.text.find(word)
while index != -1:
indexes.append((index, index + len(word)))
index = self.text.find(word, index + len(word))
return indexes
def full2short(self, config):
for kwargs in [config, self.CONFIG]:
if kwargs.__contains__('text2color'):
kwargs['t2c'] = kwargs.pop('text2color')
if kwargs.__contains__('text2font'):
kwargs['t2f'] = kwargs.pop('text2font')
if kwargs.__contains__('text2gradient'):
kwargs['t2g'] = kwargs.pop('text2gradient')
if kwargs.__contains__('text2slant'):
kwargs['t2s'] = kwargs.pop('text2slant')
if kwargs.__contains__('text2weight'):
kwargs['t2w'] = kwargs.pop('text2weight')
def set_color_by_t2c(self, t2c=None):
t2c = t2c if t2c else self.t2c
for word, color in list(t2c.items()):
for start, end in self.find_indexes(word):
self[start:end].set_color(color)
def set_color_by_t2g(self, t2g=None):
t2g = t2g if t2g else self.t2g
for word, gradient in list(t2g.items()):
for start, end in self.find_indexes(word):
self[start:end].set_color_by_gradient(*gradient)
def str2slant(self, string):
if string == NORMAL:
return cairo.FontSlant.NORMAL
if string == ITALIC:
return cairo.FontSlant.ITALIC
if string == OBLIQUE:
return cairo.FontSlant.OBLIQUE
def str2weight(self, string):
if string == NORMAL:
return cairo.FontWeight.NORMAL
if string == BOLD:
return cairo.FontWeight.BOLD
def text2hash(self):
settings = self.font + self.slant + self.weight
settings += str(self.t2f) + str(self.t2s) + str(self.t2w)
settings += str(self.line_spacing) + str(self.size)
id_str = self.text + settings
hasher = hashlib.sha256()
hasher.update(id_str.encode())
return hasher.hexdigest()[:16]
def text2settings(self):
settings = []
t2x = [self.t2f, self.t2s, self.t2w]
for i in range(len(t2x)):
fsw = [self.font, self.slant, self.weight]
if t2x[i]:
for word, x in list(t2x[i].items()):
for start, end in self.find_indexes(word):
fsw[i] = x
settings.append(TextSetting(start, end, *fsw))
# Set All text settings(default font slant weight)
fsw = [self.font, self.slant, self.weight]
settings.sort(key=lambda setting: setting.start)
temp_settings = settings.copy()
start = 0
for setting in settings:
if setting.start != start:
temp_settings.append(TextSetting(start, setting.start, *fsw))
start = setting.end
if start != len(self.text):
temp_settings.append(TextSetting(start, len(self.text), *fsw))
settings = sorted(temp_settings, key=lambda setting: setting.start)
if re.search(r'\n', self.text):
line_num = 0
for start, end in self.find_indexes('\n'):
for setting in settings:
if setting.line_num == -1:
setting.line_num = line_num
if start < setting.end:
line_num += 1
new_setting = copy.copy(setting)
setting.end = end
new_setting.start = end
new_setting.line_num = line_num
settings.append(new_setting)
settings.sort(key=lambda setting: setting.start)
break
for setting in settings:
if setting.line_num == -1:
setting.line_num = 0
return settings
def text2svg(self):
# anti-aliasing
size = self.size * 10
line_spacing = self.line_spacing * 10
if self.font == '':
if NOT_SETTING_FONT_MSG != '':
print(NOT_SETTING_FONT_MSG)
dir_name = consts.TEXT_DIR
hash_name = self.text2hash()
file_name = os.path.join(dir_name, hash_name) + '.svg'
if os.path.exists(file_name):
return file_name
surface = cairo.SVGSurface(file_name, 600, 400)
context = cairo.Context(surface)
context.set_font_size(size)
context.move_to(START_X, START_Y)
settings = self.text2settings()
offset_x = 0
last_line_num = 0
for setting in settings:
font = setting.font
slant = self.str2slant(setting.slant)
weight = self.str2weight(setting.weight)
text = self.text[setting.start:setting.end].replace('\n', ' ')
context.select_font_face(font, slant, weight)
if setting.line_num != last_line_num:
offset_x = 0
last_line_num = setting.line_num
context.move_to(START_X + offset_x, START_Y + line_spacing * setting.line_num)
context.show_text(text)
offset_x += context.text_extents(text)[4]
return file_name
class Paragraph(VGroup):
CONFIG = {
"line_spacing": -1,
"alignment": None,
}
def __init__(self, *text, **config):
Container.__init__(self, **config)
lines_str = "\n".join(list(text))
lines_str_list = lines_str.split("\n")
lines_text = Text(lines_str, **config)
lines_text_list = VGroup()
char_index_counter = 0
for line_index in range(lines_str_list.__len__()):
lines_text_list.add(
lines_text[char_index_counter:char_index_counter + lines_str_list[line_index].__len__() + 1])
char_index_counter += lines_str_list[line_index].__len__() + 1
self.lines = []
self.lines.append([])
for line_no in range(lines_text_list.__len__()):
self.lines[0].append(lines_text_list[line_no])
self.lines_initial_positions = []
for line_no in range(self.lines[0].__len__()):
self.lines_initial_positions.append(self.lines[0][line_no].get_center())
self.lines.append([])
self.lines[1].extend([self.alignment for _ in range(lines_text_list.__len__())])
VGroup.__init__(self, *[self.lines[0][i] for i in range(self.lines[0].__len__())], **config)
self.move_to(np.array([0, 0, 0]))
if self.alignment:
self.set_all_lines_alignments(self.alignment)
def set_all_lines_alignments(self, alignment):
for line_no in range(0, self.lines[0].__len__()):
self.change_alignment_for_a_line(alignment, line_no)
return self
def set_line_alignment(self, alignment, line_no):
self.change_alignment_for_a_line(alignment, line_no)
return self
def set_all_lines_to_initial_positions(self):
self.lines[1] = [None for _ in range(self.lines[0].__len__())]
for line_no in range(0, self.lines[0].__len__()):
self[line_no].move_to(self.get_center() + self.lines_initial_positions[line_no])
return self
def set_line_to_initial_position(self, line_no):
self.lines[1][line_no] = None
self[line_no].move_to(self.get_center() + self.lines_initial_positions[line_no])
return self
def change_alignment_for_a_line(self, alignment, line_no):
self.lines[1][line_no] = alignment
if self.lines[1][line_no] == "center":
self[line_no].move_to(np.array([self.get_center()[0], self[line_no].get_center()[1], 0]))
elif self.lines[1][line_no] == "right":
self[line_no].move_to(
np.array([self.get_right()[0] - self[line_no].get_width() / 2, self[line_no].get_center()[1], 0]))
elif self.lines[1][line_no] == "left":
self[line_no].move_to(
np.array([self.get_left()[0] + self[line_no].get_width() / 2, self[line_no].get_center()[1], 0]))