Handle user-defined centers for Wiggle animation (#2648)

* Handle user-defined centers for Wiggle animation

* Add unit tests for wiggle attributes

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: dmillard

manim/animation/indication.py

@@ -535,10 +535,12 @@ def __init__(
     def get_scale_about_point(self) -> np.ndarray:
         if self.scale_about_point is None:
             return self.mobject.get_center()
+        return self.scale_about_point
 
     def get_rotate_about_point(self) -> np.ndarray:
         if self.rotate_about_point is None:
             return self.mobject.get_center()
+        return self.rotate_about_point
 
     def interpolate_submobject(
         self,

tests/test_graphical_units/test_indication.py

@@ -61,3 +61,14 @@ def test_Wiggle(scene):
     square = Square()
     scene.add(square)
     scene.play(Wiggle(square))
+
+
+def test_Wiggle_custom_about_points():
+    square = Square()
+    wiggle = Wiggle(
+        square,
+        scale_about_point=[1.0, 2.0, 3.0],
+        rotate_about_point=[4.0, 5.0, 6.0],
+    )
+    assert wiggle.get_scale_about_point() == [1.0, 2.0, 3.0]
+    assert wiggle.get_rotate_about_point() == [4.0, 5.0, 6.0]