Docs: added Bezier example (#1021)

Co-authored-by: Benjamin Hackl <[email protected]>
Co-authored-by: Jason Villanueva <[email protected]>

Author: 3 people

manim/mobject/geometry.py

@@ -907,6 +907,28 @@ def __init__(self, *args, **kwargs):
 
 
 class CubicBezier(VMobject):
+    """
+    Example
+    -------
+
+    .. manim:: BezierSplineExample
+        :save_last_frame:
+
+        class BezierSplineExample(Scene):
+            def construct(self):
+                p1 = np.array([-3, 1, 0])
+                p1b = p1 + [1, 0, 0]
+                d1 = Dot(point=p1).set_color(BLUE)
+                l1 = Line(p1, p1b)
+                p2 = np.array([3, -1, 0])
+                p2b = p2 - [1, 0, 0]
+                d2 = Dot(point=p2).set_color(RED)
+                l2 = Line(p2, p2b)
+                bezier = CubicBezier([p1b, p1b + 3 * RIGHT, p2b - 3 * RIGHT, p2b])
+                self.add(l1, d1, l2, d2, bezier)
+
+    """
+
     def __init__(self, points, **kwargs):
         VMobject.__init__(self, **kwargs)
         self.set_points(points)