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ReStructuredText
220 lines
13 KiB
ReStructuredText
:github_url: hide
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.. _class_SkeletonModification2DFABRIK:
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SkeletonModification2DFABRIK
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============================
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**实验性：** This class may be changed or removed in future versions.
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**继承：** :ref:`SkeletonModification2D<class_SkeletonModification2D>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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使用 FABRIK 操纵一系列 :ref:`Bone2D<class_Bone2D>` 到达某个目标的修改器。
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.. rst-class:: classref-introduction-group
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描述
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----
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这种 :ref:`SkeletonModification2D<class_SkeletonModification2D>` 使用的是名为前后延伸反向运动学（Forward And Backward Reaching Inverse Kinematics）的算法，即 FABRIK，能够对一条骨骼链进行旋转，从而抵达目标。
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FABRIK 需要先拿到一系列骨骼的位置和长度，这组骨骼通常称作“骨骼链”。它首先会做一次向前处理，将最终的骨骼放置在目标的位置。然后让所有其他骨骼朝尖端骨骼移动，恢复原有的骨骼长度。然后再做一次向后处理，将 FABRIK 链中的根/第一根骨骼放回原点。然后移动所有其他骨骼，恢复原有的骨骼长度。这样就尽可能地让骨骼链抵达了目标，并且所有骨骼之间的长度仍然为正确的长度。
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由于 FABRIK 的工作原理，它通常比 :ref:`SkeletonModification2DCCDIK<class_SkeletonModification2DCCDIK>` 得到的结果更加自然。
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\ **注意：**\ FABRIK 修改器具有关节属性 ``fabrik_joints``\ ，里面是存放 FABRIK 链中各个关节数据的数据对象。关节和 :ref:`Bone2D<class_Bone2D>` 是两码事！FABRIK 关节存放的是 FABRIK 所使用的骨骼链中每根 :ref:`Bone2D<class_Bone2D>` 所需的数据。
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可以传入磁铁向量来帮助控制 FABRIK 关节的移动，会在求解前让骨骼朝某个方向做略微的移动，对最终结果进行微调。
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.. rst-class:: classref-reftable-group
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属性
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----
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.. table::
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:widths: auto
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+---------------------------------+-------------------------------------------------------------------------------------------------------+------------------+
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| :ref:`int<class_int>` | :ref:`fabrik_data_chain_length<class_SkeletonModification2DFABRIK_property_fabrik_data_chain_length>` | ``0`` |
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+---------------------------------+-------------------------------------------------------------------------------------------------------+------------------+
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| :ref:`NodePath<class_NodePath>` | :ref:`target_nodepath<class_SkeletonModification2DFABRIK_property_target_nodepath>` | ``NodePath("")`` |
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+---------------------------------+-------------------------------------------------------------------------------------------------------+------------------+
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.. rst-class:: classref-reftable-group
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方法
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----
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.. table::
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:widths: auto
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`NodePath<class_NodePath>` | :ref:`get_fabrik_joint_bone2d_node<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone2d_node>`\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`get_fabrik_joint_bone_index<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone_index>`\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Vector2<class_Vector2>` | :ref:`get_fabrik_joint_magnet_position<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_magnet_position>`\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`get_fabrik_joint_use_target_rotation<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_use_target_rotation>`\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`set_fabrik_joint_bone2d_node<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone2d_node>`\ (\ joint_idx\: :ref:`int<class_int>`, bone2d_nodepath\: :ref:`NodePath<class_NodePath>`\ ) |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`set_fabrik_joint_bone_index<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone_index>`\ (\ joint_idx\: :ref:`int<class_int>`, bone_idx\: :ref:`int<class_int>`\ ) |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`set_fabrik_joint_magnet_position<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_magnet_position>`\ (\ joint_idx\: :ref:`int<class_int>`, magnet_position\: :ref:`Vector2<class_Vector2>`\ ) |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`set_fabrik_joint_use_target_rotation<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_use_target_rotation>`\ (\ joint_idx\: :ref:`int<class_int>`, use_target_rotation\: :ref:`bool<class_bool>`\ ) |
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+---------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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属性说明
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--------
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.. _class_SkeletonModification2DFABRIK_property_fabrik_data_chain_length:
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.. rst-class:: classref-property
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:ref:`int<class_int>` **fabrik_data_chain_length** = ``0`` :ref:`🔗<class_SkeletonModification2DFABRIK_property_fabrik_data_chain_length>`
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.. rst-class:: classref-property-setget
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- |void| **set_fabrik_data_chain_length**\ (\ value\: :ref:`int<class_int>`\ )
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- :ref:`int<class_int>` **get_fabrik_data_chain_length**\ (\ )
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FABRIK 修改中 FABRIK 关节的数量。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_property_target_nodepath:
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.. rst-class:: classref-property
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:ref:`NodePath<class_NodePath>` **target_nodepath** = ``NodePath("")`` :ref:`🔗<class_SkeletonModification2DFABRIK_property_target_nodepath>`
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.. rst-class:: classref-property-setget
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- |void| **set_target_node**\ (\ value\: :ref:`NodePath<class_NodePath>`\ )
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- :ref:`NodePath<class_NodePath>` **get_target_node**\ (\ )
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FABRIK 修改器的目标节点的 NodePath。FABRIK 链会尝试将骨骼链转向这个节点。
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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方法说明
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--------
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.. _class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone2d_node:
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.. rst-class:: classref-method
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:ref:`NodePath<class_NodePath>` **get_fabrik_joint_bone2d_node**\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone2d_node>`
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返回分配给位于 ``joint_idx`` 的 FABRIK 关节的 :ref:`Bone2D<class_Bone2D>` 节点。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone_index:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **get_fabrik_joint_bone_index**\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_bone_index>`
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返回分配给位于 ``joint_idx`` 的 FABRIK 关节的 :ref:`Bone2D<class_Bone2D>` 节点的索引。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_get_fabrik_joint_magnet_position:
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.. rst-class:: classref-method
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:ref:`Vector2<class_Vector2>` **get_fabrik_joint_magnet_position**\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_magnet_position>`
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返回位于 ``joint_idx`` 的关节的磁吸位置向量。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_get_fabrik_joint_use_target_rotation:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **get_fabrik_joint_use_target_rotation**\ (\ joint_idx\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SkeletonModification2DFABRIK_method_get_fabrik_joint_use_target_rotation>`
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返回关节是否正在使用目标的旋转，而不是允许 FABRIK 旋转关节。此选项仅适用于链中的末端/最终关节。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone2d_node:
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.. rst-class:: classref-method
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|void| **set_fabrik_joint_bone2d_node**\ (\ joint_idx\: :ref:`int<class_int>`, bone2d_nodepath\: :ref:`NodePath<class_NodePath>`\ ) :ref:`🔗<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone2d_node>`
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设置分配给位于 ``joint_idx`` 的 FABRIK 关节的 :ref:`Bone2D<class_Bone2D>` 节点。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone_index:
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.. rst-class:: classref-method
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|void| **set_fabrik_joint_bone_index**\ (\ joint_idx\: :ref:`int<class_int>`, bone_idx\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_bone_index>`
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设置位于 ``joint_idx`` 的 FABRIK 关节的骨骼索引 ``bone_idx``\ 。可能时，这也会根据链接骨架所提供的数据来更新 FABRIK 关节的 ``bone2d_node``\ 。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_set_fabrik_joint_magnet_position:
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.. rst-class:: classref-method
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|void| **set_fabrik_joint_magnet_position**\ (\ joint_idx\: :ref:`int<class_int>`, magnet_position\: :ref:`Vector2<class_Vector2>`\ ) :ref:`🔗<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_magnet_position>`
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设置位于 ``joint_idx`` 的关节的磁吸位置向量。
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.. rst-class:: classref-item-separator
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----
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.. _class_SkeletonModification2DFABRIK_method_set_fabrik_joint_use_target_rotation:
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.. rst-class:: classref-method
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|void| **set_fabrik_joint_use_target_rotation**\ (\ joint_idx\: :ref:`int<class_int>`, use_target_rotation\: :ref:`bool<class_bool>`\ ) :ref:`🔗<class_SkeletonModification2DFABRIK_method_set_fabrik_joint_use_target_rotation>`
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设置位于 ``joint_idx`` 的关节是否正在使用目标节点的旋转，而不是让 FABRIK 旋转关节。
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\ **注意：**\ 这个选项仅适用于链中的末端/最终关节。对于所有其他节点，这个选项将被忽略。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要用户覆盖才能生效。)`
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.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
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.. |const| replace:: :abbr:`const (本方法无副作用，不会修改该实例的任何成员变量。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了能接受在此处描述的参数外，还能够继续接受任意数量的参数。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用于构造某个类型。)`
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.. |static| replace:: :abbr:`static (调用本方法无需实例，可直接使用类名进行调用。)`
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.. |operator| replace:: :abbr:`operator (本方法描述的是使用本类型作为左操作数的有效运算符。)`
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.. |bitfield| replace:: :abbr:`BitField (这个值是由下列位标志构成位掩码的整数。)`
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.. |void| replace:: :abbr:`void (无返回值。)`
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