spine-runtimes/spine-cpp/spine-cpp/include/spine/Bone.h

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#ifndef Spine_Bone_h
#define Spine_Bone_h

#include <spine/Updatable.h>

#include <spine/Vector.h>

namespace Spine
{
    class BoneData;
    class Skeleton;
    
    /// Stores a bone's current pose.
    ///
    /// A bone has a local transform which is used to compute its world transform. A bone also has an applied transform, which is a
    /// local transform that can be applied to compute the world transform. The local transform and applied transform may differ if a
    /// constraint or application code modifies the world transform after it was computed from the local transform.
    class Bone : public Updatable
    {
        RTTI_DECL;
        
        friend class RotateTimeline;
        friend class IkConstraint;
        friend class TransformConstraint;
        friend class VertexAttachment;
        friend class PathConstraint;
        friend class Skeleton;
        friend class RegionAttachment;
        friend class PointAttachment;
        
    public:
        static void setYDown(bool inValue);
        
        static bool isYDown();
        
        /// @param parent May be NULL.
        Bone(BoneData& data, Skeleton& skeleton, Bone* parent = NULL);
        
        /// Same as updateWorldTransform. This method exists for Bone to implement Spine::Updatable.
        virtual void update();
        
        /// Computes the world transform using the parent bone and this bone's local transform.
        void updateWorldTransform();
        
        /// Computes the world transform using the parent bone and the specified local transform.
        void updateWorldTransform(float x, float y, float rotation, float scaleX, float scaleY, float shearX, float shearY);
        
        void setToSetupPose();
        
        void worldToLocal(float worldX, float worldY, float& outLocalX, float& outLocalY);
        
        void localToWorld(float localX, float localY, float& outWorldX, float& outWorldY);
        
        float worldToLocalRotation(float worldRotation);
        
        float localToWorldRotation(float localRotation);
        
        ///
        /// Rotates the world transform the specified amount and sets isAppliedValid to false.
        ///
        /// @param degrees Degrees.
        void rotateWorld(float degrees);
        
        float getWorldToLocalRotationX();
        
        float getWorldToLocalRotationY();
        
        BoneData& getData();
        Skeleton& getSkeleton();
        Bone* getParent();
        Vector<Bone*>& getChildren();
        
        /// The local X translation.
        float getX();
        void setX(float inValue);
        
        /// The local Y translation.
        float getY();
        void setY(float inValue);
        
        /// The local rotation.
        float getRotation();
        void setRotation(float inValue);
        
        /// The local scaleX.
        float getScaleX();
        void setScaleX(float inValue);
        
        /// The local scaleY.
        float getScaleY();
        void setScaleY(float inValue);
        
        /// The local shearX.
        float getShearX();
        void setShearX(float inValue);
        
        /// The local shearY.
        float getShearY();
        void setShearY(float inValue);
        
        /// The rotation, as calculated by any constraints.
        float getAppliedRotation();
        void setAppliedRotation(float inValue);
        
        /// The applied local x translation.
        float getAX();
        void setAX(float inValue);
        
        /// The applied local y translation.
        float getAY();
        void setAY(float inValue);
        
        /// The applied local scaleX.
        float getAScaleX();
        void setAScaleX(float inValue);
        
        /// The applied local scaleY.
        float getAScaleY();
        void setAScaleY(float inValue);
        
        /// The applied local shearX.
        float getAShearX();
        void setAShearX(float inValue);
        
        /// The applied local shearY.
        float getAShearY();
        void setAShearY(float inValue);
        
        float getA();
        float getB();
        float getC();
        float getD();
        
        float getWorldX();
        float getWorldY();
        float getWorldRotationX();
        float getWorldRotationY();
        
        /// Returns the magnitide (always positive) of the world scale X.
        float getWorldScaleX();
        
        /// Returns the magnitide (always positive) of the world scale Y.
        float getWorldScaleY();
        
    private:
        static bool yDown;
        
        BoneData& _data;
        Skeleton& _skeleton;
        Bone* _parent;
        Vector<Bone*> _children;
        float _x, _y, _rotation, _scaleX, _scaleY, _shearX, _shearY;
        float _ax, _ay, _arotation, _ascaleX, _ascaleY, _ashearX, _ashearY;
        bool _appliedValid;
        float _a, _b, _worldX;
        float _c, _d, _worldY;
        bool _sorted;
        
        /// Computes the individual applied transform values from the world transform. This can be useful to perform processing using
        /// the applied transform after the world transform has been modified directly (eg, by a constraint)..
        ///
        /// Some information is ambiguous in the world transform, such as -1,-1 scale versus 180 rotation.
        void updateAppliedTransform();
    };
}

#endif /* Spine_Bone_h */