Let the user specify which monitor the window should show up in

custom_defaults.yml

@@ -1,56 +0,0 @@
-directories:
-  # Set this to true if you want the path to video files
-  # to match the directory structure of the path to the
-  # sourcecode generating that video
-  mirror_module_path: False
-  # Where should manim output video and image files?
-  output: ""
-  # If you want to use images, manim will look to these folders to find them
-  raster_images: ""
-  vector_images: ""
-  # If you want to use sounds, manim will look here to find it.
-  sounds: ""
-  # Manim often generates tex_files or other kinds of serialized data
-  # to keep from having to generate the same thing too many times.  By
-  # default, these will be stored at tempfile.gettempdir(), e.g. this might
-  # return whatever is at to the TMPDIR environment variable.  If you want to
-  # specify them elsewhere,
-  temporary_storage: ""
-tex:
-  executable: "latex"
-  template_file: "tex_template.tex" 
-  intermediate_filetype: "dvi"
-  text_to_replace: "[tex_expression]"
-  # For ctex, use the following configuration
-  # executable: "xelatex -no-pdf"
-  # template_file: "ctex_template.tex"
-  # intermediate_filetype: "xdv"
-universal_import_line: "from manimlib.imports import *"
-style:
-  font: "Consolas"
-  background_color: "#333333"
-# Set the position of preview window, you can use directions, e.g. UL/DR/OL/OO/...
-# also, you can also specify the position(pixel) of the upper left corner of 
-# the window on the monitor, e.g. "960,540"
-window_position: UR
-# If break_into_partial_movies is set to True, then many small
-# files will be written corresponding to each Scene.play and
-# Scene.wait call, and these files will then be combined
-# to form the full scene.  Sometimes video-editing is made
-# easier when working with the broken up scene, which
-# effectively has cuts at all the places you might want.
-break_into_partial_movies: False
-camera_qualities:
-  low:
-    resolution: "854x480"
-    frame_rate: 15
-  medium:
-    resolution: "1280x720"
-    frame_rate: 30
-  high:
-    resolution: "1920x1080"
-    frame_rate: 30
-  ultra_high:
-    resolution: "3840x2160"
-    frame_rate: 60
-  default_quality: "high"

manimlib/config.py

@@ -151,13 +151,13 @@ def get_module(file_name):
 
 
 def get_custom_defaults():
-    filename = "custom_defaults.yml"
     manim_defaults_file = os.path.join(get_manim_dir(), "manimlib", "defaults.yml")
     with open(manim_defaults_file, "r") as file:
         custom_defaults = yaml.safe_load(file)
 
     # See if there's a custom_defaults file in current directory,
     # and if so, it further updates the defaults based on it.
+    filename = "custom_defaults.yml"
     if os.path.exists(filename):
         with open(filename, "r") as file:
             local_defaults = yaml.safe_load(file)
@@ -214,9 +214,9 @@ def get_configuration(args):
     # Camera configuration
     config["camera_config"] = get_camera_configuration(args, custom_defaults)
 
-    # Default to putting window in the upper right of screen,
+    # Default to making window half the screen size
     # but make it full screen if -f is passed in
-    monitor = get_monitors()[0]
+    monitor = get_monitors()[custom_defaults["window_monitor"]]
     window_width = monitor.width
     if not args.full_screen:
         window_width //= 2

manimlib/defaults.yml

@@ -33,6 +33,7 @@ style:
 # also, you can also specify the position(pixel) of the upper left corner of 
 # the window on the monitor, e.g. "960,540"
 window_position: UR
+window_monitor: 0
 # If break_into_partial_movies is set to True, then many small
 # files will be written corresponding to each Scene.play and
 # Scene.wait call, and these files will then be combined

manimlib/window.py

@@ -20,7 +20,13 @@ class Window(PygletWindow):
         self.scene = scene
         self.title = str(scene)
         self.pressed_keys = set()
-        self.position = self.find_initial_position()
+        # No idea why, but when self.position is set once
+        # it sometimes doesn't actually change the position
+        # to the specified tuple on the rhs, but doing it
+        # twice seems to make it work.  ¯\_(ツ)_/¯
+        initial_position = self.find_initial_position()
+        self.position = initial_position
+        self.position = initial_position
 
         mglw.activate_context(window=self)
         self.timer = Timer()
@@ -29,7 +35,7 @@ class Window(PygletWindow):
 
     def find_initial_position(self):
         custom_position = get_customization()["window_position"]
-        monitor = get_monitors()[0]
+        monitor = get_monitors()[get_customization()["window_monitor"]]
         window_width, window_height = self.size
         # Position might be specified with a string of the form
         # x,y for integers x and y
@@ -42,8 +48,8 @@ class Window(PygletWindow):
         width_diff = monitor.width - window_width
         height_diff = monitor.height - window_height
         return (
-            char_to_n[custom_position[1]] * width_diff // 2,
-            char_to_n[custom_position[0]] * height_diff // 2,
+            monitor.x + char_to_n[custom_position[1]] * width_diff // 2,
+            -monitor.y + char_to_n[custom_position[0]] * height_diff // 2,
         )
 
     # Delegate event handling to scene