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# closestPointOnCurveCmd.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: closestPointOnCurve v1.0

    // FILE: closestPointOnCurveCmd.cpp

    // DESCRIPTION: -Defines `closestPointOnCurve` MEL command.

    //              -Please see readme.txt for full details.

    // AUTHOR: QT

    // REFERENCES: -This plugin's concept is based off of the "closestPointOnSurface" node.

    //             -The MEL script AEclosestPointOnSurfaceTemplate.mel was referred to for

    //              the AE template MEL script that accompanies the closestPointOnCurve node.

    // LAST UPDATED: Oct. 13th, 2001.

    // COMPILED AND TESTED ON: Maya 4.0 on Windows

    // HEADER FILES:

    #include "closestPointOnCurveCmd.h"

    #include "closestTangentUAndDistance.h"

    #include "closestPointOnCurveStrings.h"

    // CONSTRUCTOR DEFINITION:

    closestPointOnCurveCommand::closestPointOnCurveCommand()

    {

    }

    // DESTRUCTOR DEFINITION:

    closestPointOnCurveCommand::~closestPointOnCurveCommand()

    {

    }

    // METHOD FOR CREATING AN INSTANCE OF THIS COMMAND:

    void *closestPointOnCurveCommand::creator()

    {

       return new closestPointOnCurveCommand;

    }

    // CREATES THE SYNTAX OBJECT FOR THE COMMAND:

    MSyntax closestPointOnCurveCommand::newSyntax()

    {

       MSyntax syntax;

       // INPUT FLAGS:

       syntax.addFlag("-na", "-name", MSyntax::kString);

       syntax.addFlag("-ip", "-inPosition", MSyntax::kDouble, MSyntax::kDouble, MSyntax::kDouble);

       // OUTPUT/QUERYABLE FLAGS:

       syntax.addFlag("-p", "-position");

       syntax.addFlag("-nr", "-normal");

       syntax.addFlag("-t", "-tangent");

       syntax.addFlag("-u", "-paramU");

       syntax.addFlag("-d", "-distance");

       // DEFINE BEHAVIOUR OF COMMAND ARGUMENT THAT SPECIFIES THE CURVE NODE:

       syntax.useSelectionAsDefault(true);

       syntax.setObjectType(MSyntax::kSelectionList, 1, 1);

       // MAKE COMMAND QUERYABLE AND NON-EDITABLE:

       syntax.enableQuery(true);

       syntax.enableEdit(false);

       return syntax;

    }

    // MAKE THIS COMMAND UNDOABLE:

    bool closestPointOnCurveCommand::isUndoable() const

    {

       return true;

    }

    // PARSE THE COMMAND'S FLAGS AND ARGUMENTS AND STORING THEM AS PRIVATE DATA, THEN DO THE WORK BY CALLING redoIt():

    MStatus closestPointOnCurveCommand::doIt(const MArgList& args)

    {

       // CREATE THE PARSER:

       MArgDatabase argData(syntax(), args);

       // STORE FLAG INDICATORS, STORING WHETHER EACH FLAG HAS BEEN SET OR NOT:

       queryFlagSet = argData.isQuery();

       inPositionFlagSet = argData.isFlagSet("inPosition");

       positionFlagSet = argData.isFlagSet("-position");

       normalFlagSet = argData.isFlagSet("-normal");

       tangentFlagSet = argData.isFlagSet("-tangent");

       paramUFlagSet = argData.isFlagSet("-paramU");

       distanceFlagSet = argData.isFlagSet("-distance");

       // STORE THE NAME OF THE "closestPointOnCurve" NODE IF SPECIFIED, OTHERWISE ASSIGN DEFAULT:

       if (argData.isFlagSet("-name"))

          argData.getFlagArgument("-name", 0, closestPointOnCurveNodeName);

       else

          closestPointOnCurveNodeName = "";

       // STORE THE "inPosition" IF SPECIFIED, OTHERWISE ASSIGN DEFAULT:

       if (inPositionFlagSet)

       {

          argData.getFlagArgument("-inPosition", 0, inPosition.x);

          argData.getFlagArgument("-inPosition", 1, inPosition.y);

          argData.getFlagArgument("-inPosition", 2, inPosition.z);

       }

       else

       {

          inPosition.x = 0.0;

          inPosition.y = 0.0;

          inPosition.z = 0.0;

       }

       // STORE THE SPECIFIED OBJECT, INPUTTED FROM EITHER THE COMMAND ARGUMENT OR CURRENT SELECTION:

       argData.getObjects(sList);

       return redoIt();

    }

    // COMPUTING THE OUTPUT VALUES FOR THE CLOSEST POSITION, NORMAL, TANGENT, PARAMETER-U AND DISTANCE, OR CREATING A "closestPointOnCurve" NODE:

    MStatus closestPointOnCurveCommand::redoIt()

    {

       // DOUBLE-CHECK TO MAKE SURE THERE'S A SPECIFIED OBJECT TO EVALUATE ON:

       if (sList.length() == 0)

       {
           MStatus stat;
           MString msg = MStringResource::getString(kNoValidObject, stat);
           displayError(msg);
           return MStatus::kFailure;
       }

       // RETRIEVE THE SPECIFIED OBJECT AS A DAGPATH:

       MDagPath curveDagPath;
       sList.getDagPath(0, curveDagPath);

       // CHECK FOR INVALID NODE-TYPE INPUT WHEN SPECIFIED/SELECTED NODE IS *NOT* A "CURVE" NOR "CURVE TRANSFORM":

       if (!curveDagPath.node().hasFn(MFn::kNurbsCurve) && !(curveDagPath.node().hasFn(MFn::kTransform) && curveDagPath.hasFn(MFn::kNurbsCurve)))

       {
           MStatus stat;
           MString msg;
           // Use format to place variable string into message
           MString msgFmt = MStringResource::getString(kInvalidType, stat);
           MStringArray selectionStrings;
           sList.getSelectionStrings(0, selectionStrings);
           msg.format(msgFmt, selectionStrings[0]);
           displayError(msg);
           return MStatus::kFailure;
       }

       // WHEN COMMAND *NOT* IN "QUERY MODE" (I.E. "CREATION MODE"), CREATE AND CONNECT A "closestPointOnCurve" NODE AND RETURN ITS NODE NAME:

       if (!queryFlagSet)

       {

          // CREATE THE NODE:

          MFnDependencyNode depNodeFn;

          if (closestPointOnCurveNodeName == "")

             depNodeFn.create("closestPointOnCurve");

          else

             depNodeFn.create("closestPointOnCurve", closestPointOnCurveNodeName);

          closestPointOnCurveNodeName = depNodeFn.name();

          // SET THE ".inPosition" ATTRIBUTE, IF SPECIFIED IN THE COMMAND:

          if (inPositionFlagSet)

          {

             MPlug inPositionXPlug = depNodeFn.findPlug("inPositionX");

             inPositionXPlug.setValue(inPosition.x);

             MPlug inPositionYPlug = depNodeFn.findPlug("inPositionY");

             inPositionYPlug.setValue(inPosition.y);

             MPlug inPositionZPlug = depNodeFn.findPlug("inPositionZ");

             inPositionZPlug.setValue(inPosition.z);

          }

          // MAKE SOME ADJUSTMENTS WHEN THE SPECIFIED NODE IS A "TRANSFORM" OF A CURVE SHAPE:

          unsigned instanceNumber=0;

          if (curveDagPath.node().hasFn(MFn::kTransform))

          {

             // EXTEND THE DAGPATH TO ITS CURVE "SHAPE" NODE:

             curveDagPath.extendToShape();

             // TRANSFORMS ARE *NOT* NECESSARILY THE "FIRST" INSTANCE TRANSFORM OF A CURVE SHAPE:

             instanceNumber = curveDagPath.instanceNumber();

          }

          // CONNECT THE NODES:

          MPlug worldCurvePlug, inCurvePlug;

          inCurvePlug = depNodeFn.findPlug("inCurve");

          depNodeFn.setObject(curveDagPath.node());

          worldCurvePlug = depNodeFn.findPlug("worldSpace");

          worldCurvePlug = worldCurvePlug.elementByLogicalIndex(instanceNumber);

          MDGModifier dgModifier;

          dgModifier.connect(worldCurvePlug, inCurvePlug);

          dgModifier.doIt();

          // SET COMMAND RESULT TO BE NEW NODE'S NAME, AND RETURN:

          setResult(closestPointOnCurveNodeName);

          return MStatus::kSuccess;

       }

       // OTHERWISE, WE'RE IN THE COMMAND'S "QUERY MODE":

       else

       {

          // COMPUTE THE CLOSEST POSITION, NORMAL, TANGENT, PARAMETER-U AND DISTANCE, USING THE *FIRST* INSTANCE TRANSFORM WHEN CURVE IS SPECIFIED AS A "SHAPE":

          MPoint position;

          MVector normal, tangent;

          double paramU, distance;

          closestTangentUAndDistance(curveDagPath, inPosition, position, normal, tangent, paramU, distance);

          // WHEN NO QUERYABLE FLAG IS SPECIFIED, INDICATE AN ERROR:

          if (!positionFlagSet && !normalFlagSet && !tangentFlagSet && !paramUFlagSet && !distanceFlagSet)

          {
              MStatus stat;
              MString msg = MStringResource::getString(kNoQueryFlag, stat);
              displayError(msg);
              return MStatus::kFailure;
         }

          // WHEN JUST THE "DISTANCE" IS QUERIED, RETURN A SINGLE "FLOAT" INSTEAD OF AN ENTIRE FLOAT ARRAY FROM THE COMMAND:

          else if (distanceFlagSet && !(positionFlagSet || normalFlagSet || tangentFlagSet || paramUFlagSet))

             setResult(distance);

          // WHEN JUST THE "PARAMETER-U" IS QUERIED, RETURN A SINGLE "FLOAT" INSTEAD OF AN ENTIRE FLOAT ARRAY FROM THE COMMAND:

          else if (paramUFlagSet && !(positionFlagSet || normalFlagSet || tangentFlagSet || distanceFlagSet))

             setResult(paramU);

          // OTHERWISE, SET THE RETURN VALUE OF THE COMMAND'S RESULT TO A "COMPOSITE ARRAY OF FLOATS":

          else

          {

             // HOLDS FLOAT ARRAY RESULT:

             MDoubleArray floatArrayResult;

             // APPEND THE RESULTS OF THE CLOSEST POSITION, NORMAL, TANGENT, PARAMETER-U AND DISTANCE VALUES TO THE FLOAT ARRAY RESULT:

             if (positionFlagSet)

             {

                floatArrayResult.append(position.x);

                floatArrayResult.append(position.y);

                floatArrayResult.append(position.z);

             }

             if (normalFlagSet)

             {

                floatArrayResult.append(normal.x);

                floatArrayResult.append(normal.y);

                floatArrayResult.append(normal.z);

             }

             if (tangentFlagSet)

             {

                floatArrayResult.append(tangent.x);

                floatArrayResult.append(tangent.y);

                floatArrayResult.append(tangent.z);

             }

             if (paramUFlagSet)

                floatArrayResult.append(paramU);

             if (distanceFlagSet)

                floatArrayResult.append(distance);

             // FINALLY, SET THE COMMAND'S RESULT:

             setResult(floatArrayResult);

          }

          return MStatus::kSuccess;

       }

    }

    // CALLED WHEN USER UNDOES THE COMMAND:

    MStatus closestPointOnCurveCommand::undoIt()

    {

       // MERELY DELETE THE "closestPointOnCurve" NODE THAT WAS CREATED, IF ONE WAS CREATED:

       if (!queryFlagSet)

       {

          MString deleteCmd = "delete ";

          deleteCmd += closestPointOnCurveNodeName;

          MGlobal::executeCommand(deleteCmd);

       }

       return MStatus::kSuccess;

    }