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# particleSystemInfoCmd.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.
    // ==========================================================================
    //+

    //
    // particleSystemInfoCmd
    //
    // Demonstrates the use of the new MFnParticleSystem class for retrieving
    // particle information.  The number of particle positions followed by
    // the positions are printed to the script editor.
    //
    //  Syntax:
    //      particleSystemInfo $particleNodeName;
    //
    //  Example:
    //  particleSystemInfo particleShape2;
    //

    #include <assert.h>

    #include <maya/MIOStream.h>
    #include <maya/MGlobal.h>
    #include <maya/MString.h>
    #include <maya/MPoint.h>
    #include <maya/MVector.h>
    #include <maya/MPointArray.h>
    #include <maya/MVectorArray.h>
    #include <maya/MFloatMatrix.h>
    #include <maya/MArgList.h>
    #include <maya/MPlug.h>
    #include <maya/MFnDependencyNode.h>
    #include <maya/MDagPath.h>
    #include <maya/MItDag.h>
    #include <maya/MSelectionList.h>
    #include <maya/MPlug.h>
    #include <maya/MPlugArray.h>
    #include <maya/MPxCommand.h>
    #include <maya/MFnDagNode.h>
    #include <maya/MFnParticleSystem.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MObjectArray.h>

    #define mCommandName "particleSystemInfo"   // Command name

    #define CHECKRESULT(stat,msg)     \
            if ( MS::kSuccess != stat ) { \
                    cerr << msg << endl;      \
            }

    class particleSystemInfoCmd : public MPxCommand
    {
    public:
                     particleSystemInfoCmd();
        virtual     ~particleSystemInfoCmd();

        virtual MStatus doIt ( const MArgList& args );

        static void* creator();

    private:

        static MStatus nodeFromName(MString name, MObject & obj);

        MStatus parseArgs ( const MArgList& args );

        MObject particleNode;
    };

    particleSystemInfoCmd::particleSystemInfoCmd()
    {
    }

    particleSystemInfoCmd::~particleSystemInfoCmd()
    {
    }

    //
    //

    MStatus particleSystemInfoCmd::nodeFromName(MString name, MObject & obj)
    {
        MSelectionList tempList;
        tempList.add( name );
        if ( tempList.length() > 0 )
        {
            tempList.getDependNode( 0, obj );
            return MS::kSuccess;
        }
        return MS::kFailure;
    }

    MStatus particleSystemInfoCmd::parseArgs( const MArgList& args )
    {
        // Parse the arguments.
        MStatus stat = MS::kSuccess;

        if( args.length() > 1 )
        {
            MGlobal::displayError( "Too many arguments." );
            return MS::kFailure;
        }

        if( args.length() == 1 )
        {
                MString particleName = args.asString( 0, &stat );
            CHECKRESULT(stat, "Failed to parse particle node name argument." );

            nodeFromName( particleName, particleNode );

            if( !particleNode.isNull() && !particleNode.hasFn( MFn::kParticle ) )
            {
                    MGlobal::displayError( "The named node is not a particle system." );
                return MS::kFailure;
            }
        }
        return MS::kSuccess;
    }

    //
    // Main routine
    MStatus particleSystemInfoCmd::doIt( const MArgList& args )
    {
        MStatus stat = parseArgs( args );
        if( stat != MS::kSuccess ) return stat;

        if( particleNode.isNull() ) {
                MObject parent;
            MFnParticleSystem dummy;
            particleNode = dummy.create(&stat);
            CHECKRESULT(stat,"MFnParticleSystem::create(status) failed!");

            MFnParticleSystem ps( particleNode, &stat );
            CHECKRESULT(stat,"MFnParticleSystem::MFnParticleSystem(MObject,status) failed!");

            MPointArray posArray;
            posArray.append(MPoint(-5,  5, 0));
            posArray.append(MPoint(-5, 10, 0));

            MVectorArray velArray;
            velArray.append(MPoint(1, 1, 0));
            velArray.append(MPoint(1, 1, 0));
            stat = ps.emit(posArray, velArray);
            CHECKRESULT(stat,"MFnParticleSystem::emit(posArray,velArray) failed!");

            stat = ps.emit(MPoint(5,  5, 0));
            CHECKRESULT(stat,"MFnParticleSystem::emit(pos) failed!");
            stat = ps.emit(MPoint(5, 10, 0));
            CHECKRESULT(stat,"MFnParticleSystem::emit(pos) failed!");

            stat = ps.saveInitialState();
            CHECKRESULT(stat,"MFnParticleSystem::saveInitialState() failed!");

            MVectorArray accArray;
            accArray.setLength(4);
            for( unsigned int i=0; i<accArray.length(); i++ )
            {
                    MVector& acc = accArray[i];
                acc.x = acc.y = acc.z = 3.0;
            }
            MString accName("acceleration");
            ps.setPerParticleAttribute( accName, accArray, &stat );
            CHECKRESULT(stat,"MFnParticleSystem::setPerParticleAttribute(vectorArray) failed!");
        }

        MFnParticleSystem ps( particleNode, &stat );
        CHECKRESULT(stat,"MFnParticleSystem::MFnParticleSystem(MObject,status) failed!");

        if( ! ps.isValid() )
        {
            MGlobal::displayError( "The function set is invalid!" );
            return MS::kFailure;
        }

        const MString name = ps.particleName();
        const MFnParticleSystem::RenderType psType = ps.renderType();
        const unsigned int count = ps.count();

        const char* typeString = NULL;
        switch( psType )
        {
        case MFnParticleSystem::kCloud:
            typeString = "Cloud";
            break;
        case MFnParticleSystem::kTube:
            typeString = "Tube system";
            break;
        case MFnParticleSystem::kBlobby:
            typeString = "Blobby";
            break;
        case MFnParticleSystem::kMultiPoint:
            typeString = "MultiPoint";
            break;
        case MFnParticleSystem::kMultiStreak:
            typeString = "MultiStreak";
            break;
        case MFnParticleSystem::kNumeric:
            typeString = "Numeric";
            break;
        case MFnParticleSystem::kPoints:
            typeString = "Points";
            break;
        case MFnParticleSystem::kSpheres:
            typeString = "Spheres";
            break;
        case MFnParticleSystem::kSprites:
            typeString = "Sprites";
            break;
        case MFnParticleSystem::kStreak:
            typeString = "Streak";
            break;
        default:
            typeString = "Particle system";
            assert( false );
            break;
        }

        char buffer[256];

        sprintf( buffer, "%s \"%s\" has %u primitives.", typeString, name.asChar(), count );
        MGlobal::displayInfo( buffer );

        unsigned i;

        MIntArray ids;
        ps.particleIds( ids );

        sprintf( buffer, "count : %u ", count );
        MGlobal::displayInfo( buffer );
        sprintf( buffer, "%u ids.", ids.length() );
        MGlobal::displayInfo( buffer );

        assert( ids.length() == count );
        for( i=0; i<ids.length(); i++ )
        {
            sprintf( buffer, "id %d  ", ids[i] );
            MGlobal::displayInfo( buffer );
        }

        MVectorArray positions;
        ps.position( positions );
        assert( positions.length() == count );
        for( i=0; i<positions.length(); i++ )
        {
            MVector& p = positions[i];
            sprintf( buffer, "pos %f %f %f  ", p[0], p[1], p[2] );
            MGlobal::displayInfo( buffer );
        }

        MVectorArray vels;
        ps.velocity( vels );
        assert( vels.length() == count );
        for( i=0; i<vels.length(); i++ )
        {
            const MVector& v = vels[i];
            sprintf( buffer, "vel %f %f %f  ", v[0], v[1], v[2] );
            MGlobal::displayInfo( buffer );
        }

        MVectorArray accs;
        ps.acceleration( accs );
        assert( accs.length() == count );
        for( i=0; i<accs.length(); i++ )
        {
            const MVector& a = accs[i];
            sprintf( buffer, "acc %f %f %f  ", a[0], a[1], a[2] );
            MGlobal::displayInfo( buffer );
        }

        bool flag = ps.isDeformedParticleShape(&stat);
        CHECKRESULT(stat,"MFnParticleSystem::isDeformedParticleShape() failed!");
        if( flag ) {
                MObject obj = ps.originalParticleShape(&stat);
            CHECKRESULT(stat,"MFnParticleSystem::originalParticleShape() failed!");
            if( obj != MObject::kNullObj ) {
                    MFnParticleSystem ps( obj );
                sprintf( buffer, "original particle shape : %s ", ps.particleName().asChar() );
                MGlobal::displayInfo( buffer );
            }
        }

        flag = ps.isDeformedParticleShape(&stat);
        CHECKRESULT(stat,"MFnParticleSystem::isDeformedParticleShape() failed!");
        if( !flag ) {
                MObject obj = ps.deformedParticleShape(&stat);
            CHECKRESULT(stat,"MFnParticleSystem::deformedParticleShape() failed!");
            if( obj != MObject::kNullObj ) {
                    MFnParticleSystem ps( obj );
                sprintf( buffer, "deformed particle shape : %s ", ps.particleName().asChar() );
                MGlobal::displayInfo( buffer );
            }
        }

        if( ids.length() == positions.length() &&
            ids.length() == vels.length()      &&
            ids.length() == accs.length()       ) {
                setResult( int(ids.length()) );
        } else {
                setResult( int(-1) );
        }

        return MS::kSuccess;
    }

    //
    //

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

    MStatus initializePlugin( MObject obj )
    {
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "4.5", "Any");

        MStatus status = plugin.registerCommand(mCommandName,
                                                particleSystemInfoCmd::creator );
        if (!status)
            status.perror("registerCommand");

        return status;
    }

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

        MStatus status = plugin.deregisterCommand(mCommandName);
        if (!status)
            status.perror("deregisterCommand");

        return status;
    }