VPivotJoint¶

Qualified name: manim\_pymunk.constraints.VPivotJoint

class VPivotJoint(a_mob, b_mob, pivot_world=None, anchor_a_local=array([0., 0., 0.]), anchor_b_local=array([0., 0., 0.]), anchor_a_appearance=Dot, anchor_b_appearance=Dot, pivot_appearance=Dot, connect_line_class=<class 'manim.mobject.geometry.line.Line'>, connect_line_config={'color': ManimColor('#F7D96F'), 'stroke_width': 2}, **kwargs)[source]¶

Bases: VConstraint

A pivot joint allows two rigid bodies to rotate freely around a common pivot point. The pivot point acts as an axis of rotation, ensuring that both bodies remain attached at the specified position regardless of external forces.

Please configure pivot_world or (anchor_a_loca, anchor_b_local).

Parameters¶

a_mob: The first Mobject to be connected.
b_mob: The second Mobject to be connected.
pivot_world: The global coordinate position of the pivot point. If provided, anchor_a_local and anchor_b_local are calculated automatically based on this.
anchor_a_local: The local anchor point on a_mob corresponding to the pivot, relative to the Mobject’s center.
anchor_b_local: The local anchor point on b_mob corresponding to the pivot, relative to the Mobject’s center.
pivot_appearance: The Mobject used to visually represent the pivot point (defaults to a white Dot with 0.05 radius).

Examples¶

Example: VPivotJointExample ¶

from manim import *

from manim_pymunk import *

class VPivotJointExample(SpaceScene):
    def construct(self):

        static_dot = Dot(ORIGIN)
        square = Square().move_to(static_dot)
        square2 = Square().move_to(static_dot.get_center() + UP * 2).scale(0.5)

        constraints = [
            VPivotJoint(static_dot, square),
            VPivotJoint(
                square,
                square2,
                pivot_world= UP*3,
            ),
        ]

        self.add_static_body(static_dot)
        self.add_dynamic_body(square, square2, angular_velocity=PI * 2)
        self.add_shapes_filter(static_dot, square, square2, group=2)
        self.add_constraints(*constraints)
        self.wait(3)

from manim_pymunk import *

class VPivotJointExample(SpaceScene):
    def construct(self):

        static_dot = Dot(ORIGIN)
        square = Square().move_to(static_dot)
        square2 = Square().move_to(static_dot.get_center() + UP * 2).scale(0.5)

        constraints = [
            VPivotJoint(static_dot, square),
            VPivotJoint(
                square,
                square2,
                pivot_world= UP*3,
            ),
        ]

        self.add_static_body(static_dot)
        self.add_dynamic_body(square, square2, angular_velocity=PI * 2)
        self.add_shapes_filter(static_dot, square, square2, group=2)
        self.add_constraints(*constraints)
        self.wait(3)

Methods

`install`	Verify the validity of constraint parameters.
`mob_updater`	Visual control updater

Attributes

`always`	Call a method on a mobject every frame.
`animate`	Used to animate the application of any method of `self`.
`animation_overrides`
`color`
`depth`	The depth of the mobject.
`fill_color`	If there are multiple colors (for gradient) this returns the first one
`height`	The height of the mobject.
`n_points_per_curve`
`sheen_factor`
`stroke_color`
`width`	The width of the mobject.

_abc_impl = <_abc._abc_data object>¶

_bezier_t_values: npt.NDArray[float]¶

_original__init__(a_mob, b_mob, pivot_world=None, anchor_a_local=array([0., 0., 0.]), anchor_b_local=array([0., 0., 0.]), anchor_a_appearance=Dot, anchor_b_appearance=Dot, pivot_appearance=Dot, connect_line_class=<class 'manim.mobject.geometry.line.Line'>, connect_line_config={'color': ManimColor('#F7D96F'), 'stroke_width': 2}, **kwargs)¶

Initialize self. See help(type(self)) for accurate signature.

Parameters:

a_mob (Mobject)
b_mob (Mobject)
pivot_world (list[float, float, float])
anchor_a_local (list[float, float, float])
anchor_b_local (list[float, float, float])
anchor_a_appearance (Mobject)
anchor_b_appearance (Mobject)
pivot_appearance (Mobject)
connect_line_class (Line | None)
connect_line_config (dict)

animation_overrides = {}¶

background_image: Image | str | None¶

background_stroke_color: ManimColor¶

background_stroke_opacity: float¶

background_stroke_width: float¶

cap_style: CapStyleType¶

close_new_points: bool¶

constraint: PivotJoint | None¶

install(space)[source]¶

Verify the validity of constraint parameters.

Parameters:: space (Space)

joint_type: LineJointType¶

make_smooth_after_applying_functions: bool¶

mob_updater(mob, dt)[source]¶: Visual control updater

n_points_per_cubic_curve: int¶

pre_function_handle_to_anchor_scale_factor: float¶

shade_in_3d: bool¶

submobjects: list[VMobject]¶

tolerance_for_point_equality: float¶

Parameters:

a_mob (Mobject)
b_mob (Mobject)
pivot_world (list[float, float, float])
anchor_a_local (list[float, float, float])
anchor_b_local (list[float, float, float])
anchor_a_appearance (Mobject)
anchor_b_appearance (Mobject)
pivot_appearance (Mobject)
connect_line_class (Line | None)
connect_line_config (dict)