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# convertVerticesToEdgesCmd.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.
    // ==========================================================================
    //+

    // DISCLAIMER: THIS PLUGIN IS PROVIDED AS IS.  IT IS NOT SUPPORTED BY

    //            AUTODESK, SO PLEASE USE AND MODIFY AT YOUR OWN RISK.

    //

    // PLUGIN NAME: Convert Vertices To Contained Edges Command v1.0

    // FILE: convertVerticesToEdgesCmd.cpp

    // DESCRIPTION: o MEL command that converts a selection of vertices into a selection of edges that interconnect

    //                the original vertices (i.e. only edges whose composite vertices are contained in the original

    //                vertex selection).  The command's return value is a string array that contains the names of

    //                all of the new contained edges.

    //              o This MEL command has no flags, returns a string array, and operates on selected vertices.

    //              o Example MEL usage:

    //                   select -r pCube1.vtx[2:5];

    //                   string $convertedEdges[] = `convertVerticesToEdges`;

    //                   // Result: pCube1.e[1:2] pCube1.e[6:7] //

    // AUTHOR: QT

    // LAST UPDATED: Oct. 11th, 2001.

    // TESTED ON: Maya 4.0 on Windows

    // STEPS TO INSTALL: 1) Unzip the file convertVerticesToEdges_v1_0_Maya4_Windows.zip to any temporary directory.

    //                   2) Copy the file convertVerticesToEdgesCmd.mll to: /AW/Maya4.0/bin/plug-ins/

    //                   3) Launch Maya and load the plugin from Windows->Setting/Preferences->Plugin Manager.

    // BEGIN PLUGIN:

    // =============

    // HEADER FILES:

    #include <maya/MFnPlugin.h>

    #include <maya/MPxCommand.h>

    #include <maya/MGlobal.h>

    #include <maya/MSelectionList.h>

    #include <maya/MItSelectionList.h>

    #include <maya/MObject.h>

    #include <maya/MDagPath.h>

    #include <maya/MItMeshVertex.h>

    #include <maya/MItMeshEdge.h>

    // MAIN CLASS FOR THE MEL COMMAND:

    class convertVerticesToContainedEdgesCommand : public MPxCommand

    {

       public:

          convertVerticesToContainedEdgesCommand();

          virtual ~convertVerticesToContainedEdgesCommand();

          static void* creator();

          bool isUndoable() const;

          MStatus doIt(const MArgList&);

          MStatus redoIt();

          MStatus undoIt();

       private:

          MSelectionList previousSelectionList;

    };

    // CONSTRUCTOR:

    convertVerticesToContainedEdgesCommand::convertVerticesToContainedEdgesCommand()

    {

    }

    // DESTRUCTOR CLEARS, AND FREES MEMORY OF THE PREVIOUS SELECTION LIST:

    convertVerticesToContainedEdgesCommand::~convertVerticesToContainedEdgesCommand()

    {

       previousSelectionList.clear();

    }

    // FOR CREATING AN INSTANCE OF THIS COMMAND:

    void* convertVerticesToContainedEdgesCommand::creator()

    {

       return new convertVerticesToContainedEdgesCommand;

    }

    // MAKE THIS COMMAND UNDOABLE:

    bool convertVerticesToContainedEdgesCommand::isUndoable() const

    {

       return true;

    }

    // SAVE THE PREVIOUS SELECTION, AND THEN CALL redoIt(), WHICH DOES MOST OF THE WORK:

    MStatus convertVerticesToContainedEdgesCommand::doIt(const MArgList& args)

    {

       MGlobal::getActiveSelectionList(previousSelectionList);

       return redoIt();

    }

    // CONVERTS THE SELECTED VERTICES TO "CONTAINED EDGES", AND RETURN FROM THE MEL COMMAND, A STRING ARRAY OF THE NEW EDGES:

    MStatus convertVerticesToContainedEdgesCommand::redoIt()

    {

       MSelectionList finalEdgesSelection;

       MDagPath meshDagPath;

       MObject multiVertexComponent, singleVertexComponent;

       int dummyIndex;

       // ITERATE THROUGH EACH "VERTEX COMPONENT" THAT IS CURRENTLY SELECTED:

       for (MItSelectionList vertexComponentIter(previousSelectionList, MFn::kMeshVertComponent); !vertexComponentIter.isDone(); vertexComponentIter.next())

       {

          // STORE THE DAGPATH, COMPONENT OBJECT AND MESH NAME OF THE CURRENT VERTEX COMPONENT:

          vertexComponentIter.getDagPath(meshDagPath, multiVertexComponent);

          MString meshName = meshDagPath.fullPathName();

          // VERTEX COMPONENT HAS TO CONTAIN AT LEAST ONE VERTEX:

          if (!multiVertexComponent.isNull())

          {

             // ITERATE THROUGH EACH "VERTEX" IN THE CURRENT VERTEX COMPONENT:

             for (MItMeshVertex vertexIter(meshDagPath, multiVertexComponent); !vertexIter.isDone(); vertexIter.next())

             {

                // FOR STORING THE EDGES CONNECTED TO EACH VERTEX:

                MIntArray connectedEdgesIndices;

                vertexIter.getConnectedEdges(connectedEdgesIndices);

                // ITERATE THROUGH EACH EDGE CONNECTED TO THE CURRENT VERTEX:

                MItMeshEdge edgeIter(meshDagPath);

                for (unsigned i=0; i<connectedEdgesIndices.length(); i++)

                {

                   // FIND AND STORE THE *FIRST* "END VERTEX" OF THE CURRENT EDGE:

                   edgeIter.setIndex(connectedEdgesIndices[i], dummyIndex);

                   MSelectionList singleVertexList;

                   MString vertexName = meshName;

                   vertexName += ".vtx[";

                   vertexName += edgeIter.index(0);

                   vertexName += "]";

                   singleVertexList.add(vertexName);

                   singleVertexList.getDagPath(0, meshDagPath, singleVertexComponent);

                   // SEE WHETHER THE VERTEX BELONGS TO THE ORIGINAL SELECTION, AND IF IT DOES PROCEED TO CHECK NEXT END VERTEX:

                   if (!singleVertexComponent.isNull() && previousSelectionList.hasItem(meshDagPath, singleVertexComponent))

                   {

                      // FIND AND STORE THE *SECOND* "END VERTEX" OF THE CURRENT EDGE:

                      singleVertexList.clear();

                      vertexName = meshName;

                      vertexName += ".vtx[";

                      vertexName += edgeIter.index(1);

                      vertexName += "]";

                      singleVertexList.add(vertexName);

                      singleVertexList.getDagPath(0, meshDagPath, singleVertexComponent);

                      // SEE WHETHER THE VERTEX BELONGS TO THE ORIGINAL SELECTION, AND IF IT DOES, ADD THE EDGE TO THE FINAL CONTAINED EDGES LIST:

                      if (!singleVertexComponent.isNull() && previousSelectionList.hasItem(meshDagPath, singleVertexComponent))

                      {

                         MString edgeName = meshName;

                         edgeName += ".e[";

                         edgeName += connectedEdgesIndices[i];

                         edgeName += "]";

                         finalEdgesSelection.add(edgeName);

                      }

                   }

                }

             }

          }

       }

       // FINALLY, MAKE THE NEW "CONTAINED EDGES", THE CURRENT SELECTION:

       MGlobal::setActiveSelectionList(finalEdgesSelection, MGlobal::kReplaceList);

       // RETURN NEW CONTAINED EDGES LIST FROM THE MEL COMMAND, AS AN ARRAY OF STRINGS:

       MStringArray containedEdgesArray;

       finalEdgesSelection.getSelectionStrings(containedEdgesArray);

       MPxCommand::setResult(containedEdgesArray);

       return MS::kSuccess;

    }

    // TO UNDO THE COMMAND, SIMPLY RESTORE THE ORIGINAL SELECTION BEFORE THE COMMAND WAS INVOKED:

    MStatus convertVerticesToContainedEdgesCommand::undoIt()

    {

       MGlobal::setActiveSelectionList(previousSelectionList, MGlobal::kReplaceList);

       return MS::kSuccess;

    }

    // INITIALIZES THE PLUGIN:

    MStatus initializePlugin(MObject obj)

    {

       MStatus status;

       MFnPlugin plugin(obj, PLUGIN_COMPANY, "4.0", "Any");

       status = plugin.registerCommand("convertVerticesToEdges", convertVerticesToContainedEdgesCommand::creator);

       if (!status)

       {

          status.perror("registerCommand");

          return status;

       }

       return status;

    }

    // UNINITIALIZES THE PLUGIN:

    MStatus uninitializePlugin(MObject obj)

    {

       MStatus status;

       MFnPlugin plugin(obj);

       status = plugin.deregisterCommand("convertVerticesToEdges");

       if (!status)

       {

          status.perror("deregisterCommand");

          return status;

       }

       return status;

    }

    // ============================================================================================================== END PLUGIN.