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| # Copyright (c) Meta Platforms, Inc. and affiliates. | |
| # This source code is licensed under the MIT license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| from __future__ import annotations | |
| from animated_drawings.model.transform import Transform | |
| from typing import List | |
| class Joint(Transform): | |
| """ | |
| Skeletal joint used representing character poses. | |
| """ | |
| def __init__(self, **kwargs) -> None: | |
| super().__init__(**kwargs) | |
| def joint_count(self) -> int: | |
| """ Returns 1 + the number of Joint children in this joint's kinematic chain (recursive) """ | |
| count: int = 1 | |
| for c in self.get_children(): | |
| if isinstance(c, Joint): | |
| count += c.joint_count() | |
| return count | |
| def get_chain_worldspace_positions(self) -> List[float]: | |
| """ Get xzy worldspace coordinates of all joints within the chain. """ | |
| self.update_transforms(update_ancestors=True) | |
| return self._get_chain_worldspace_positions(self, []) | |
| def _get_chain_worldspace_positions(self, joint: Joint, position_list: List[float]) -> List[float]: | |
| position_list.extend(joint.get_world_position(update_ancestors=False)) | |
| for c in joint.get_children(): | |
| if not isinstance(c, Joint): | |
| continue | |
| self._get_chain_worldspace_positions(c, position_list) | |
| return position_list | |
| def get_chain_joint_names(self): | |
| """ Traverse through joint in depth-first order and return names of joints in the order they are visited. """ | |
| joint_names: List[str] = [] | |
| return self._get_chain_joint_names(self, joint_names) | |
| def _get_chain_joint_names(self, joint: Joint, joint_name_list: List[str]) -> List[str]: | |
| joint_name_list.append(str(joint.name)) | |
| for c in joint.get_children(): | |
| if not isinstance(c, Joint): | |
| continue | |
| self._get_chain_joint_names(c, joint_name_list) | |
| return joint_name_list | |