transCircleNode/transCircleNode.cpp
 
 
 
transCircleNode/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;
}