finish config, structure, constants and custom_default

docs/source/documentation/custom_default.rst

@@ -1,2 +1,125 @@
-custom_default (TODO)
-=====================
+custom_default
+==============
+
+``directories``
+---------------
+
+- ``mirror_module_path``
+    (``True`` or ``False``) Whether to create a folder named the name of the 
+    running file under the ``output`` path, and save the output (``images/`` 
+    or ``videos/``) in it.
+
+- ``output``
+    Output file path, the videos will be saved in the ``videos/`` folder under it, 
+    and the pictures will be saved in the ``images/`` folder under it.
+
+    For example, if you set ``output`` to ``"/.../manim/output"`` and 
+    ``mirror_module_path`` to ``False``, then you exported ``Scene1`` in the code 
+    file and saved the last frame, then the final directory structure will be like:
+
+    .. code-block:: text
+        :emphasize-lines: 8, 10
+
+            manim/
+            ├── manimlib/
+            │   ├── animation/
+            │   ├── ...
+            │   └── window.py
+            ├── output/
+            │   ├── images
+            │   │   └── Scene1.png
+            │   └── videos
+            │       └── Scene1.mp4
+            ├── code.py
+            ├── custom_default.yml
+            └── manim.py
+
+    But if you set ``mirror_module_path`` to ``True``, the directory structure will be:
+
+    .. code-block:: text
+        :emphasize-lines: 7
+
+            manim/
+            ├── manimlib/
+            │   ├── animation/
+            │   ├── ...
+            │   └── window.py
+            ├── output/
+            │   └── code/
+            │       ├── images
+            │       │   └── Scene1.png
+            │       └── videos
+            │           └── Scene1.mp4
+            ├── code.py
+            ├── custom_default.yml
+            └── manim.py
+
+- ``raster_images`` 
+    The directory for storing raster images to be used in the code (including 
+    ``.jpg``, ``.png`` and ``.gif``), which will be read by ``ImageMobject``.
+
+- ``vector_images``
+    The directory for storing vector images to be used in the code (including 
+    ``.svg`` and ``.xdv``), which will be read by ``SVGMobject``.
+
+- ``temporary_storage``
+    The directory for storing temporarily generated cache files, including 
+    ``Tex`` cache, ``Text`` cache and storage of object points.
+
+``tex``
+-------
+
+- ``executable``
+    The executable program used to compile LaTeX (``latex`` or ``xelatex -no-pdf``
+    is recommended)
+
+- ``template_file``
+    LaTeX template used, in ``manimlib/tex_templates``
+
+- ``intermediate_filetype``
+    The type of intermediate vector file generated after compilation (``dvi`` if 
+    ``latex`` is used, ``xdv`` if ``xelatex`` is used)
+    
+- ``text_to_replace``
+    The text to be replaced in the template (needn't to change)
+
+``universal_import_line``
+-------------------------
+
+Import line that need to execute when entering interactive mode directly.
+
+``style``
+---------
+
+- ``font`` 
+    Default font of Text
+
+- ``background_color``
+    Default background color
+
+``window_position``
+-------------------
+
+The relative position of the playback window on the display (two characters, 
+the first character means upper(U) / middle(O) / lower(D), the second character 
+means left(L) / middle(O) / right(R)).
+
+``camera_qualities``
+--------------------
+
+Export quality
+
+- ``low``
+    Low quality (default is 480p15)
+
+- ``medium``
+    Medium quality (default is 720p30)
+
+- ``high``
+    High quality (default is 1080p30)
+
+- ``ultra_high``
+    Ultra high quality (default is 4K60)
+
+- ``default_quality``
+    Default quality (one of the above four)