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# transCircleNode.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 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/MPxNode.h>

    #include <maya/MString.h>
    #include <maya/MTypeId.h>
    #include <maya/MPlug.h>

    #include <maya/MFnNumericAttribute.h>

    #include <maya/MFnPlugin.h>
    #include <maya/MDataBlock.h>
    #include <maya/MDataHandle.h>

    #include <string.h>
    #include <maya/MIOStream.h>
    #include <math.h>

    class transCircle : public MPxNode
    {
    public:
                            transCircle() {};
        virtual             ~transCircle() {};

        virtual MStatus     compute( const MPlug& plug, MDataBlock& data );
        static  void*       creator();
        static  MStatus     initialize();

        static  MObject     input;            // The input value.
        static  MObject     inputTranslateX;  // The translate X value.  (input)
        static  MObject     inputTranslateY;  // The translate Y value.  (input)
        static  MObject     inputTranslateZ;  // The translate Z value.  (input)
        static  MObject     inputTranslate;
        static  MObject     outputTranslateX; // The translate X value.  (output)
        static  MObject     outputTranslateY; // The translate Y value.  (output)
        static  MObject     outputTranslateZ; // The translate Z value.  (output)
        static  MObject     outputTranslate;
        static  MObject     frames;           // Number of frames for one circle.
        static  MObject     scale;            // Size of circle.
        static  MTypeId     id;
    };

    MTypeId transCircle::id( 0x80013 );
    MObject transCircle::input;
    MObject transCircle::frames;
    MObject transCircle::scale;
    MObject transCircle::inputTranslate;
    MObject transCircle::outputTranslate;
    MObject transCircle::inputTranslateX;
    MObject transCircle::inputTranslateY;
    MObject transCircle::inputTranslateZ;
    MObject transCircle::outputTranslateX;
    MObject transCircle::outputTranslateY;
    MObject transCircle::outputTranslateZ;

    void* transCircle::creator()
    {
        return new transCircle;
    }

    MStatus transCircle::initialize()
    {
        MFnNumericAttribute nAttr;
        MStatus             stat;

        input = nAttr.create( "input", "in", MFnNumericData::kDouble, 0.0 );
        nAttr.setStorable(true);

        inputTranslateX = nAttr.create( "inputTranslateX", "itX",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setStorable(true);

        inputTranslateY = nAttr.create( "inputTranslateY", "itY",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setStorable(true);

        inputTranslateZ = nAttr.create( "inputTranslateZ", "itZ",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setStorable(true);

        inputTranslate = nAttr.create( "inputTranslate", "it",
                                        inputTranslateX,
                                        inputTranslateY,
                                        inputTranslateZ );
        nAttr.setStorable(true);
        nAttr.setDefault(0.0,0.0,0.0);

        outputTranslateX = nAttr.create( "outputTranslateX", "otX",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setWritable(false);
        nAttr.setStorable(true);

        outputTranslateY = nAttr.create( "outputTranslateY", "otY",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setWritable(false);
        nAttr.setStorable(true);

        outputTranslateZ = nAttr.create( "outputTranslateZ", "otZ",
                                        MFnNumericData::kDouble, 0.0 );
        nAttr.setWritable(false);
        nAttr.setStorable(true);

        outputTranslate = nAttr.create( "outputTranslate", "ot",
                                        outputTranslateX,
                                        outputTranslateY,
                                        outputTranslateZ );
        nAttr.setWritable(false);
        nAttr.setStorable(true);
        nAttr.setDefault(0.0,0.0,0.0);

        scale = nAttr.create( "scale", "sc",
                                        MFnNumericData::kDouble, 10.0 );
        nAttr.setStorable(true);

        frames = nAttr.create( "frames", "fr",
                                        MFnNumericData::kDouble, 48.0 );
        nAttr.setStorable(true);

        stat = addAttribute( inputTranslate );
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute( input );
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute( scale );
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute( frames );
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute( outputTranslate );
            if (!stat) { stat.perror("addAttribute"); return stat;}

        stat = attributeAffects( inputTranslateX, outputTranslateX );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslateY, outputTranslateY );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslateZ, outputTranslateZ );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslate, outputTranslateX );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslate, outputTranslateY );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslate, outputTranslateZ );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( inputTranslate, outputTranslate );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( input, outputTranslateX );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( input, outputTranslateY );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( scale, outputTranslateX );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( scale, outputTranslateY );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( frames, outputTranslateX );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( frames, outputTranslateY );
            if (!stat) { stat.perror("attributeAffects"); return stat;}

        return MS::kSuccess;
    }

    MStatus transCircle::compute( const MPlug& plug, MDataBlock& data )
    {
        MStatus stat;

        bool k = ( plug == outputTranslateX ) |
                 ( plug == outputTranslateY ) |
                 ( plug == outputTranslateZ ) |
                 ( plug == outputTranslate );
        if (!k) return MS::kUnknownParameter;

        MDataHandle inputData = data.inputValue( input, &stat );
        if (!stat) { stat.perror("inputValue: input"); return stat;}

        MDataHandle scaleData = data.inputValue( scale, &stat );
        if (!stat) { stat.perror("inputValue: scale"); return stat;}

        MDataHandle framesData = data.inputValue( frames, &stat );
        if (!stat) { stat.perror("inputValue: frames"); return stat;}

        MDataHandle transData  = data.inputValue( inputTranslate, &stat );
        if (!stat) { stat.perror("inputValue: inputTranslate"); return stat;}

        double3& iTranslate = transData.asDouble3();
        double currentFrame = inputData.asDouble();
        double scaleFactor  = scaleData.asDouble();
        double framesPerCircle = framesData.asDouble();
        double angle = 6.2831853 * ( currentFrame/framesPerCircle );
        double3 oTranslate;

        oTranslate[0] = iTranslate[0] + (sin( angle ) * scaleFactor);
        oTranslate[1] = iTranslate[1] + 1.0;
        oTranslate[2] = iTranslate[2] + (cos( angle ) * scaleFactor);

        MDataHandle otHandle = data.outputValue( outputTranslate );
        otHandle.set( oTranslate[0], oTranslate[1], oTranslate[2] );
        data.setClean(plug);

        return MS::kSuccess;
    }

    MStatus initializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

        status = plugin.registerNode( "transCircle", transCircle::id,
                             transCircle::creator, transCircle::initialize );
        if (!status) {
            status.perror("registerNode");
            return status;
        }

        return status;
    }

    MStatus uninitializePlugin( MObject obj)
    {
        MStatus   status;
        MFnPlugin plugin( obj );

        status = plugin.deregisterNode( transCircle::id );
        if (!status) {
            status.perror("deregisterNode");
            return status;
        }

        return status;
    }