translateCmd/translateCmd.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.
// ==========================================================================
//+

// DESCRIPTION:
//
// Produces the MEL command "translate".
//
// This plug-in translates the CVs of selected curves, surfaces, or polygonal
// objects by a user specified amount. It is a good example of manipulating CVs
// on these three data types. 
//
// To use it, select an object and then execute "translate 1.0 2.0 3.0" in the command window.
//
// Note that this command will not work on NURBS primitives with construction history.
// The history forces the CVs to return to their original position immediately after
// the translate command has moved them. To allow the translate command to work on such surfaces,
// you must either delete the construction history on the object (Edit > Delete by Type > History),
// or open the Tool Settings window before creating the surface and turn off History. 
//

#include <maya/MIOStream.h>

#include <maya/MPxCommand.h>
#include <maya/MFnPlugin.h>
#include <maya/MString.h>
#include <maya/MArgList.h>
#include <maya/MGlobal.h>
#include <maya/MSelectionList.h>
#include <maya/MItSelectionList.h>
#include <maya/MPoint.h>
#include <maya/MVector.h>
#include <maya/MDagPath.h>

#include <maya/MItCurveCV.h>
#include <maya/MItSurfaceCV.h>
#include <maya/MItMeshVertex.h>


class translate : public MPxCommand
{
public:
                    translate() {};
                ~translate() override; 

    MStatus         doIt( const MArgList& args ) override;
    static void*    creator();
};

translate::~translate() {}

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

// If given no arguments, translate all selected objects by 1 unit on
// the X axis.  If 3 double parameters are given, they specify the X,
// Y, and Z components of the vector to translate objects by.
MStatus translate::doIt( const MArgList& args )
{
    MStatus stat;
    MVector     vector( 1.0, 0.0, 0.0 );

    if ( args.length() == 3 )  {
        unsigned i = 0;
        vector = args.asVector(i,3);
    }

    // Create a selection list iterator
    //
    MSelectionList slist;
    MGlobal::getActiveSelectionList( slist );
    MItSelectionList iter( slist, MFn::kInvalid, &stat );

    if ( MS::kSuccess == stat ) {
        MDagPath    mdagPath;       // Item dag path
        MObject     mComponent;     // Current component

        // Translate all selected objects
        //
        for ( ; !iter.isDone(); iter.next() ) 
        {
            // Get path and possibly a component
            //
            iter.getDagPath( mdagPath, mComponent );

            MItCurveCV cvFn( mdagPath, mComponent, &stat );
            if ( MS::kSuccess == stat ) {
                for ( ; !cvFn.isDone(); cvFn.next() ) {
                    if ( MS::kFailure == cvFn.translateBy( vector ) ) {
                        cerr << "Error setting CV\n";
                    }
                }
                cvFn.updateCurve();
            }

            MItSurfaceCV sCvFn( mdagPath, mComponent, true, &stat );
            if ( MS::kSuccess == stat ) {
                for ( ; !sCvFn.isDone(); sCvFn.nextRow() ) {
                    for ( ; !sCvFn.isRowDone(); sCvFn.next() ) {
                        if ( MS::kFailure == sCvFn.translateBy( vector ) ) {
                            cerr << "Error setting CV\n";
                        }
                    }
                }
                sCvFn.updateSurface();
            }

            MItMeshVertex vtxFn( mdagPath, mComponent, &stat );
            if ( MS::kSuccess == stat ) {
                for ( ; !vtxFn.isDone(); vtxFn.next() ) {
                    if ( MS::kFailure == vtxFn.translateBy( vector ) ) {
                        cerr << "Error setting Vertex\n";
                    }
                }
                vtxFn.updateSurface();
            }

        }
    }
    else {
        cerr << "Error creating selection list iterator\n";
    }
    return MS::kSuccess;
}


//
// The following routines are used to register/unregister
// the command we are creating within Maya
//
MStatus initializePlugin( MObject obj )
{
    MStatus   status;
    MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

    status = plugin.registerCommand( "translate", translate::creator );
    if (!status) {
        status.perror("registerCommand");
        return status;
    }

    return status;
}

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

    status = plugin.deregisterCommand( "translate" );
    if (!status) {
        status.perror("deregisterCommand");
        return status;
    }

    return status;
}