rockingTransform/rockingTransform.h

//-
// ==========================================================================
// Copyright 2015 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+
#include <maya/MMatrix.h>
#include <maya/MPxTransform.h>
#include <maya/MPxTransformationMatrix.h>


//
// Define declarations
//

#define kRockingTransformNodeID 0x81109
#define kRockingTransformMatrixID 0x8110A

#define ReturnOnError(status)              \
        if (MS::kSuccess != status) {      \
            return status;                \
        }

//
// Class declarations -- matrix and transform
//

class rockingTransformMatrix : public MPxTransformationMatrixPreRotation
{
    // A really simple implementation of MPxTransformationMatrix.
    // The methods include:
    // - Two accessor methods for getting and setting the 
    // rock
    // - The virtual asMatrix() method which passes the matrix 
    // back to Maya when the command "xform -q -ws -m" is invoked

    public:
        rockingTransformMatrix();
        static MPxTransformationMatrix *creator();
        
        MMatrix asMatrix() const override;
        MMatrix asMatrix(double percent) const override;
        MMatrix asRotateMatrix() const override;
        MQuaternion preRotation() const override;

        // Degrees
        double  getRockInX() const;
        void    setRockInX( double rock );
        
        static  MTypeId id;
    protected:      
        typedef MPxTransformationMatrixPreRotation ParentClass;
        // Degrees
        double rockXValue;
};

class rockingTransformNode : public MPxTransformPreRotation
{
    // A really simple custom transform.
    public:
        rockingTransformNode();
        ~rockingTransformNode() override;

        MPxTransformationMatrix *createTransformationMatrix() override;
                    
        void postConstructor() override;

        MStatus validateAndSetValue(const MPlug&, const MDataHandle&) override;
                    
        void  resetTransformation (MPxTransformationMatrix *) override;
        void  resetTransformation (const MMatrix &) override;
                    
        // Utility for getting the related rock matrix pointer
        rockingTransformMatrix *getRockingTransformMatrix();
                
        const char* className();

        static  void *  creator();
        static  MStatus initialize();
        
        MStatus     compute( const MPlug& plug, MDataBlock& data ) override;
        MStatus     computeLocalTransformation(MPxTransformationMatrix *xform, MDataBlock &block) override;

        static  MTypeId id;
    protected:
        // Degrees
        static  MObject aRockInX;
        typedef MPxTransformPreRotation ParentClass;
};

class DegreeRadianConverter
{
    public:
        double degreesToRadians( double degrees );
        double radiansToDegrees( double radians );
};