scale stroke_width if font_size is too small or too big

Author: irvanalhaq9

manim/animation/creation.py

@@ -94,7 +94,6 @@ def construct(self):
 from ..animation.animation import Animation
 from ..animation.composition import Succession
 from ..mobject.mobject import Group, Mobject
-from ..mobject.svg.svg_mobject import SVGMobject
 from ..mobject.types.vectorized_mobject import VMobject
 from ..utils.bezier import integer_interpolate
 from ..utils.rate_functions import double_smooth, linear
@@ -303,8 +302,9 @@ class Write(DrawBorderThenFill):
     vmobject
         The VMobject to animate.
     stroke_width
-        Stroke width for drawing. If not given, for SVG-based mobjects (such as :class:`Text`, :class:`MarkupText`, or :class:`MathTex`)
-        the stroke width is scaled relative to the font size. Others use 2.0.
+        Stroke width for drawing. If not provided, it is scaled based on font size
+        for text-based mobjects when the font is very small or very large;
+        otherwise defaults to 2.0.
     rate_func
         The function defining the animation progress.
     reverse
@@ -386,10 +386,11 @@ def _adjust_stroke_width_for_text(
     ) -> float:
         if stroke_width is not None:
             return stroke_width
-        if not isinstance(vmobject, SVGMobject):
-            return 2  # default in DrawBorderThenFill
         font_size = getattr(vmobject, "font_size", DEFAULT_FONT_SIZE)
-        return (font_size / DEFAULT_FONT_SIZE) * DEFAULT_STROKE_WIDTH * scale_factor
+        if font_size < 20 or font_size > 6 * DEFAULT_FONT_SIZE:
+            # Assuming the user is using MovingCameraScene and performing a zoom-in or zoom-out
+            return (font_size / DEFAULT_FONT_SIZE) * DEFAULT_STROKE_WIDTH * scale_factor
+        return 2  # default in DrawBorderThenFill
 
     def reverse_submobjects(self) -> None:
         self.mobject.invert(recursive=True)