New Text Mobject

manimlib/constants.py

@@ -5,13 +5,15 @@
 VIDEO_DIR = ""
 VIDEO_OUTPUT_DIR = ""
 TEX_DIR = ""
+TEXT_DIR = ""
 
 
 def initialize_directories(config):
     global MEDIA_DIR
     global VIDEO_DIR
     global VIDEO_OUTPUT_DIR
     global TEX_DIR
+    global TEXT_DIR
 
     video_path_specified = config["video_dir"] or config["video_output_dir"]
 
@@ -37,6 +39,7 @@ def initialize_directories(config):
             )
 
     TEX_DIR = config["tex_dir"] or os.path.join(MEDIA_DIR, "Tex")
+    TEXT_DIR = os.path.join(MEDIA_DIR, "texts")
     if not video_path_specified:
         VIDEO_DIR = os.path.join(MEDIA_DIR, "videos")
         VIDEO_OUTPUT_DIR = os.path.join(MEDIA_DIR, "videos")
@@ -45,10 +48,28 @@ def initialize_directories(config):
     else:
         VIDEO_DIR = config["video_dir"]
 
-    for folder in [VIDEO_DIR, VIDEO_OUTPUT_DIR, TEX_DIR]:
+    for folder in [VIDEO_DIR, VIDEO_OUTPUT_DIR, TEX_DIR, TEXT_DIR]:
         if folder != "" and not os.path.exists(folder):
             os.makedirs(folder)
 
+NOT_SETTING_FONT_MSG='''
+Warning:
+You haven't set font.
+If you are not using English, this may cause text rendering problem.
+You set font like:
+text = Text('your text', font='your font')
+or:
+class MyText(Text):
+    CONFIG = {
+        'font': 'My Font'
+    }
+'''
+START_X = 30
+START_Y = 20
+NORMAL = 'NORMAL'
+ITALIC = 'ITALIC'
+OBLIQUE = 'OBLIQUE'
+BOLD = 'BOLD'
 
 TEX_USE_CTEX = False
 TEX_TEXT_TO_REPLACE = "YourTextHere"

manimlib/imports.py

@@ -49,6 +49,7 @@
 from manimlib.mobject.svg.drawings import *
 from manimlib.mobject.svg.svg_mobject import *
 from manimlib.mobject.svg.tex_mobject import *
+from manimlib.mobject.svg.text_mobject import *
 from manimlib.mobject.three_d_utils import *
 from manimlib.mobject.three_dimensions import *
 from manimlib.mobject.types.image_mobject import *

manimlib/mobject/svg/svg_mobject.py

@@ -81,7 +81,7 @@ def get_mobjects_from(self, element):
             self.update_ref_to_element(element)
         elif element.tagName == 'style':
             pass  # TODO, handle style
-        elif element.tagName in ['g', 'svg']:
+        elif element.tagName in ['g', 'svg', 'symbol']:
             result += it.chain(*[
                 self.get_mobjects_from(child)
                 for child in element.childNodes
@@ -284,12 +284,27 @@ def handle_transforms(self, element, mobject):
             pass
         # TODO, ...
 
+    def flatten(self, input_list):
+        output_list = []
+        for i in input_list:
+            if isinstance(i, list):
+                output_list.extend(self.flatten(i))
+            else:
+                output_list.append(i)
+        return output_list
+
+    def get_all_childNodes_have_id(self, element):
+        all_childNodes_have_id = []
+        if not isinstance(element, minidom.Element):
+            return
+        if element.hasAttribute('id'):
+            return element
+        for e in element.childNodes:
+            all_childNodes_have_id.append(self.get_all_childNodes_have_id(e))
+        return self.flatten([e for e in all_childNodes_have_id if e])
+
     def update_ref_to_element(self, defs):
-        new_refs = dict([
-            (element.getAttribute('id'), element)
-            for element in defs.childNodes
-            if isinstance(element, minidom.Element) and element.hasAttribute('id')
-        ])
+        new_refs = dict([(e.getAttribute('id'), e) for e in self.get_all_childNodes_have_id(defs)])
         self.ref_to_element.update(new_refs)
 
     def move_into_position(self):

manimlib/mobject/svg/text_mobject.py

@@ -0,0 +1,208 @@
+import re
+import os
+import copy
+import hashlib
+import cairo
+import manimlib.constants as consts
+from manimlib.constants import *
+from manimlib.mobject.svg.svg_mobject import SVGMobject
+from manimlib.utils.config_ops import digest_config
+
+
+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,
+        # Text
+        'font': '',
+        'gradient': None,
+        'lsh': -1,
+        'size': 1,
+        'slant': NORMAL,
+        'weight': NORMAL,
+        't2c': {},
+        't2f': {},
+        't2g': {},
+        't2s': {},
+        't2w': {},
+    }
+
+    def __init__(self, text, **config):
+        self.text = text
+        self.full2short(config)
+        digest_config(self, config)
+        self.lsh = self.size if self.lsh == -1 else self.lsh
+
+        file_name = self.text2svg()
+        SVGMobject.__init__(self, file_name, **config)
+
+        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
+        self.scale(0.1)
+
+    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__('line_spacing_height'):
+                kwargs['lsh'] = kwargs.pop('line_spacing_height')
+            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.lsh) + 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
+        lsh = self.lsh * 10
+
+        if self.font == '':
+            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 + lsh*setting.line_num)
+            context.show_text(text)
+            offset_x += context.text_extents(text)[4]
+
+        return file_name