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# moveTool.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.
    // ==========================================================================
    //+

    //
    // moveTool.cc
    //
    // Description:
    //    Interactive tool for moving objects and components.
    //
    //    This plug-in will register the following two commands in Maya:
    //       moveToolCmd <x> <y> <z>
    //       moveToolContext
    //
    #include <maya/MIOStream.h>
    #include <stdio.h>
    #include <stdlib.h>

    #include <maya/MPxToolCommand.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MArgList.h>
    #include <maya/MGlobal.h>
    #include <maya/MItSelectionList.h>
    #include <maya/MPoint.h>
    #include <maya/MVector.h>
    #include <maya/MDagPath.h>

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

    #include <maya/MPxSelectionContext.h>
    #include <maya/MPxContextCommand.h>
    #include <maya/M3dView.h>
    #include <maya/MFnCamera.h>

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

    #define kVectorEpsilon 1.0e-3

    //
    // The move command
    //
    // - this is a tool command which can be used in tool
    //   contexts or in the MEL command window.
    //
    #define     MOVENAME    "moveToolCmd"
    #define     DOIT        0
    #define     UNDOIT      1
    #define     REDOIT      2

    class moveCmd : public MPxToolCommand
    {
    public:
        moveCmd();
        virtual ~moveCmd();

        MStatus     doIt( const MArgList& args );
        MStatus     redoIt();
        MStatus     undoIt();
        bool        isUndoable() const;
        MStatus     finalize();

    public:
        static void* creator();

        void        setVector( double x, double y, double z);
    private:
        MVector     delta;  // the delta vectors
        MStatus     action( int flag ); // do the work here
    };

    moveCmd::moveCmd( )
    {
        setCommandString( MOVENAME );
    }

    moveCmd::~moveCmd()
    {}

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

    bool moveCmd::isUndoable() const
    //
    // Description
    //     Set this command to be undoable.
    //
    {
        return true;
    }

    void moveCmd::setVector( double x, double y, double z)
    {
        delta.x = x;
        delta.y = y;
        delta.z = z;
    }

    MStatus moveCmd::finalize()
    //
    // Description
    //     Command is finished, construct a string for the command
    //     for journalling.
    //
    {
        MArgList command;
        command.addArg( commandString() );
        command.addArg( delta.x );
        command.addArg( delta.y );
        command.addArg( delta.z );

        // This call adds the command to the undo queue and sets
        // the journal string for the command.
        //
        return MPxToolCommand::doFinalize( command );
    }

    MStatus moveCmd::doIt( const MArgList& args )
    //
    // Description
    //      Test MItSelectionList class
    //
    {
        MStatus stat;
        MVector vector( 1.0, 0.0, 0.0 );    // default delta
        unsigned i = 0;

        switch ( args.length() )     // set arguments to vector
        {
            case 1:
                vector.x = args.asDouble( 0, &stat );
                break;
            case 2:
                vector.x = args.asDouble( 0, &stat );
                vector.y = args.asDouble( 1, &stat );
                break;
            case 3:
                vector = args.asVector(i,3);
                break;
            case 0:
            default:
                break;
        }
        delta = vector;

        return action( DOIT );
    }

    MStatus moveCmd::undoIt( )
    //
    // Description
    //      Undo last delta translation
    //
    {
        return action( UNDOIT );
    }

    MStatus moveCmd::redoIt( )
    //
    // Description
    //      Redo last delta translation
    //
    {
        return action( REDOIT );
    }

    MStatus moveCmd::action( int flag )
    //
    // Description
    //      Do the actual work here to move the objects by vector
    //
    {
        MStatus stat;
        MVector vector = delta;

        switch( flag )
        {
            case UNDOIT:    // undo
                vector.x = -vector.x;
                vector.y = -vector.y;
                vector.z = -vector.z;
                break;
            case REDOIT:    // redo
                break;
            case DOIT:      // do command
                break;
            default:
                break;
        }

        // 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
            MSpace::Space spc = MSpace::kWorld;

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

                MFnTransform transFn( mdagPath, &stat );
                if ( MS::kSuccess == stat ) {
                    stat = transFn.translateBy( vector, spc );
                    CHECKRESULT(stat,"Error doing translate on transform");
                    continue;
                }

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

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

                MItMeshVertex vtxFn( mdagPath, mComponent, &stat );
                if ( MS::kSuccess == stat ) {
                    for ( ; !vtxFn.isDone(); vtxFn.next() ) {
                        stat = vtxFn.translateBy( vector, spc );
                        CHECKRESULT(stat,"Error setting Vertex");
                    }
                    vtxFn.updateSurface();
                }
            } // for
        }
        else {
            cerr << "Error creating selection list iterator" << endl;
        }
        return MS::kSuccess;
    }

    //
    // The moveTool Context
    //
    // - tool contexts are custom event handlers. The selection
    //   context class defaults to maya's selection mode and
    //   allows you to override press/drag/release events.
    //
    #define     MOVEHELPSTR        "drag to move selected object"
    #define     MOVETITLESTR       "moveTool"
    #define     TOP         0
    #define     FRONT       1
    #define     SIDE        2
    #define     PERSP       3

    class moveContext : public MPxSelectionContext
    {
    public:
        moveContext();
        virtual void    toolOnSetup( MEvent & event );
        virtual MStatus doPress( MEvent & event );
        virtual MStatus doDrag( MEvent & event );
        virtual MStatus doRelease( MEvent & event );
        virtual MStatus doEnterRegion( MEvent & event );

    private:
        int currWin;
        MEvent::MouseButtonType downButton;
        M3dView view;
        short startPos_x, endPos_x, start_x, last_x;
        short startPos_y, endPos_y, start_y, last_y;
        moveCmd * cmd;
    };

    moveContext::moveContext()
    {
        MString str( MOVETITLESTR );
        setTitleString( str );

        // Tell the context which XPM to use so the tool can properly
        // be a candidate for the 6th position on the mini-bar.
        setImage("moveTool.xpm", MPxContext::kImage1 );
    }

    void moveContext::toolOnSetup( MEvent & )
    {
        MString str( MOVEHELPSTR );
        setHelpString( str );
    }

    MStatus moveContext::doPress( MEvent & event )
    {
        MStatus stat = MPxSelectionContext::doPress( event );
        MSpace::Space spc = MSpace::kWorld;

        // If we are not in selecting mode (i.e. an object has been selected)
        // then set up for the translation.
        //
        if ( !isSelecting() ) {
            event.getPosition( startPos_x, startPos_y );
            view = M3dView::active3dView();

            MDagPath camera;
            stat = view.getCamera( camera );
            if ( stat != MS::kSuccess ) {
                cerr << "Error: M3dView::getCamera" << endl;
                return stat;
            }
            MFnCamera fnCamera( camera );
            MVector upDir = fnCamera.upDirection( spc );
            MVector rightDir = fnCamera.rightDirection( spc );

            // Determine the camera used in the current view
            //
            if ( fnCamera.isOrtho() ) {
                if ( upDir.isEquivalent(MVector::zNegAxis,kVectorEpsilon) ) {
                    currWin = TOP;
                } else if ( rightDir.isEquivalent(MVector::xAxis,kVectorEpsilon) ) {
                    currWin = FRONT;
                } else  {
                    currWin = SIDE;
                }
            }
            else {
                currWin = PERSP;
            }

            // Create an instance of the move tool command.
            //
            cmd = (moveCmd*)newToolCommand();

            cmd->setVector( 0.0, 0.0, 0.0 );
        }
        return stat;
    }

    MStatus moveContext::doDrag( MEvent & event )
    {
        MStatus stat;
        stat = MPxSelectionContext::doDrag( event );

        // If we are not in selecting mode (i.e. an object has been selected)
        // then do the translation.
        //
        if ( !isSelecting() ) {
            event.getPosition( endPos_x, endPos_y );
            MPoint endW, startW;
            MVector vec;
            view.viewToWorld( startPos_x, startPos_y, startW, vec );
            view.viewToWorld( endPos_x, endPos_y, endW, vec );
            downButton = event.mouseButton();

            // We reset the the move vector each time a drag event occurs
            // and then recalculate it based on the start position.
            //
            cmd->undoIt();

            switch( currWin )
            {
                case TOP:
                    switch ( downButton )
                    {
                        case MEvent::kMiddleMouse :
                            cmd->setVector( endW.x - startW.x, 0.0, 0.0 );
                            break;
                        case MEvent::kLeftMouse :
                        default:
                            cmd->setVector( endW.x - startW.x, 0.0,
                                                   endW.z - startW.z );
                            break;
                    }
                    break;

                case FRONT:
                    switch ( downButton )
                    {
                        case MEvent::kMiddleMouse :
                            cmd->setVector( endW.x - startW.x, 0.0, 0.0 );
                            break;
                        case MEvent::kLeftMouse :
                        default:
                            cmd->setVector( endW.x - startW.x,
                                                   endW.y - startW.y, 0.0 );
                            break;
                    }
                    break;

                case SIDE:
                    switch ( downButton )
                    {
                        case MEvent::kMiddleMouse :
                            cmd->setVector( 0.0, 0.0, endW.z - startW.z );
                            break;
                        case MEvent::kLeftMouse :
                        default:
                            cmd->setVector( 0.0, endW.y - startW.y,
                                                   endW.z - startW.z );
                            break;
                    }
                    break;

                case PERSP:
                    break;
            }

            stat = cmd->redoIt();
            view.refresh( true );
        }
        return stat;
    }

    MStatus moveContext::doRelease( MEvent & event )
    {
        MStatus stat = MPxSelectionContext::doRelease( event );
        if ( !isSelecting() ) {
            event.getPosition( endPos_x, endPos_y );

            // Delete the move command if we have moved less then 2 pixels
            // otherwise call finalize to set up the journal and add the
            // command to the undo queue.
            //
            if ( abs(startPos_x - endPos_x) < 2 && abs(startPos_y - endPos_y) < 2 ) {
                delete cmd;
                view.refresh( true );
            }
            else {
                stat = cmd->finalize();
                view.refresh( true );
            }
        }
        return stat;
    }

    MStatus moveContext::doEnterRegion( MEvent & /*event*/ )
    //
    // Print the tool description in the help line.
    //
    {
        MString str( MOVEHELPSTR );
        return setHelpString( str );
    }

    //
    // Context creation command
    //
    //  This is the command that will be used to create instances
    //  of our context.
    //
    #define     CREATE_CTX_NAME "moveToolContext"

    class moveContextCommand : public MPxContextCommand
    {
    public:
        moveContextCommand() {};
        virtual MPxContext * makeObj();

    public:
        static void* creator();
    };

    MPxContext * moveContextCommand::makeObj()
    {
        return new moveContext();
    }

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

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

        status = plugin.registerContextCommand( CREATE_CTX_NAME,
                                        &moveContextCommand::creator,
                                        MOVENAME, &moveCmd::creator );
        if (!status) {
            status.perror("registerContextCommand");
            return status;
        }

        return status;
    }

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

        status = plugin.deregisterContextCommand( CREATE_CTX_NAME, MOVENAME );
        if (!status) {
            status.perror("deregisterContextCommand");
            return status;
        }

        return status;
    }