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# cvColorNode.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.
    // ==========================================================================
    //+

    #include <maya/MPxLocatorNode.h>
    #include <maya/MString.h>
    #include <maya/MTypeId.h>
    #include <maya/MPlug.h>
    #include <maya/MMatrix.h>
    #include <maya/MPoint.h>
    #include <maya/MPointArray.h>
    #include <maya/MDataBlock.h>
    #include <maya/MDataHandle.h>
    #include <maya/MColor.h>
    #include <maya/M3dView.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MFnNumericAttribute.h>
    #include <maya/MFnTypedAttribute.h>
    #include <maya/MFnNurbsSurface.h>
    #include <maya/MFnNurbsSurfaceData.h>
    #include <maya/MFnPointArrayData.h>
    #include <maya/MFnMatrixData.h>
    #include <maya/MIOStream.h>

    class cvColor : public MPxLocatorNode
    {
    public:
                                cvColor();
        virtual                 ~cvColor();

        virtual MStatus         compute( const MPlug& plug, MDataBlock& data );

        virtual void            draw( M3dView & view, const MDagPath & path,
                                      M3dView::DisplayStyle style,
                                      M3dView::DisplayStatus status );

        virtual bool            isBounded() const;

        static  void *          creator();
        static  MStatus         initialize();

        static  MTypeId         id;
        static  MObject         drawingEnabled;
        static  MObject         pointSize;
        static  MObject         inputSurface;
        static  MObject         cvLocations;
    };

    MTypeId cvColor::id( 0x80006 );
    MObject cvColor::inputSurface;
    MObject cvColor::cvLocations;
    MObject cvColor::pointSize;
    MObject cvColor::drawingEnabled;

    cvColor::cvColor() {}
    cvColor::~cvColor() {}

    MStatus cvColor::compute( const MPlug& plug, MDataBlock& data )
    {
        MStatus stat;

        // cout << "cvColor::compute\n";

        if ( plug == cvLocations ) {
            MDataHandle inputData = data.inputValue ( inputSurface, &stat );
            if (!stat) {
                stat.perror("cvColor::compute get inputSurface");
                return stat;
            }

            MObject surf = inputData.asNurbsSurface();
            MFnNurbsSurface surfFn (surf, &stat);
            if (!stat) {
                stat.perror("cvColor::compute surface creator");
                return stat;
            }

            MDataHandle outputData = data.outputValue ( cvLocations, &stat );
            if (!stat) {
                stat.perror("cvColor::compute get cvLocations");
                return stat;
            }

            MObject cvs = outputData.data();
            MFnPointArrayData cvData(cvs, &stat);
            if (!stat) {
                stat.perror("cvColor::compute point array data creator");
                return stat;
            }

            MPointArray cvArray;
            stat = surfFn.getCVs( cvArray, MSpace::kObject);
            if (!stat) {
                stat.perror("cvColor::compute getCVs");
                return stat;
            }

            stat = cvData.set ( cvArray );
            if (!stat) {
                stat.perror("cvColor::compute setCVs");
                return stat;
            }

            outputData.set ( cvs );

            stat = data.setClean ( plug );
            if (!stat) {
                stat.perror("cvColor::compute setClean");
                return stat;
            }
        } else {
            return MS::kUnknownParameter;
        }

        return MS::kSuccess;
    }

    void cvColor::draw( M3dView & view, const MDagPath & path,
                                 M3dView::DisplayStyle style,
                                 M3dView::DisplayStatus status )
    {
        // cout << "cvColor::draw\n";

        MStatus     stat;
        MObject     thisNode = thisMObject();

        MPlug enPlug( thisNode, drawingEnabled );
        bool doDrawing;
        stat = enPlug.getValue ( doDrawing );
        if (!stat) {
            stat.perror("cvColor::draw get drawingEnabled");
            return;
        }

        if (!doDrawing)
            return;

        MPlug szPlug( thisNode, pointSize );
        float ptSize;
        stat = szPlug.getValue ( ptSize );
        if (!stat) {
            stat.perror("cvColor::draw get pointSize");
            ptSize = 4.0;
        }

        MPlug cvPlug( thisNode, cvLocations );
        MObject cvObject;
        stat = cvPlug.getValue(cvObject);
        if (!stat) {
            stat.perror("cvColor::draw get cvObject");
            return;
        }

        MFnPointArrayData cvData(cvObject, &stat);
        if (!stat) {
            stat.perror("cvColor::draw get point array data");
            return;
        }

        MPointArray cvs = cvData.array( &stat );
        if (!stat) {
            stat.perror("cvColor::draw get point array");
            return;
        }

        // Extract the 'worldMatrix' attribute that is inherited from 'dagNode'
        //
        MFnDependencyNode fnThisNode( thisNode );
        MObject worldSpaceAttribute = fnThisNode.attribute( "worldMatrix" );
        MPlug matrixPlug( thisNode, worldSpaceAttribute);

        // 'worldMatrix' is an array so we must specify which element the plug
        // refers to
        matrixPlug = matrixPlug.elementByLogicalIndex (0);

        // Get the value of the 'worldMatrix' attribute
        //
        MObject matObject;
        stat = matrixPlug.getValue(matObject);
        if (!stat) {
            stat.perror("cvColor::draw get matObject");
            return;
        }

        MFnMatrixData matrixData(matObject, &stat);
        if (!stat) {
            stat.perror("cvColor::draw get world matrix data");
            return;
        }

        MMatrix worldSpace = matrixData.matrix( &stat );
        if (!stat) {
            stat.perror("cvColor::draw get world matrix");
            return;
        }

        view.beginGL();

        // Push the color settings
        //
        glPushAttrib( GL_CURRENT_BIT | GL_POINT_BIT );
        glPointSize( ptSize );
        glDisable ( GL_POINT_SMOOTH );  // Draw square "points"

        glBegin( GL_POINTS );

            int numCVs = cvs.length();
            for (int i = 0; i < numCVs; i++) {
                // cout << "cv[" << i << "]: " << cvs[i] << ": ";
                MPoint      cv( cvs[i] );
                MColor      cvColor;

                cv *= worldSpace;

                if (cv.x < 0 && cv.y < 0) {
                    // cout << "Red";
                    cvColor.r = 1.0;
                    cvColor.g = 0.0;
                    cvColor.b = 0.0;
                } else if (cv.x < 0 && cv.y >= 0) {
                    // cout << "Cyan";
                    cvColor.r = 0.0;
                    cvColor.g = 1.0;
                    cvColor.b = 1.0;
                } else if (cv.x >= 0 && cv.y < 0) {
                    // cout << "Blue";
                    cvColor.r = 0.0;
                    cvColor.g = 0.0;
                    cvColor.b = 1.0;
                } else if (cv.x >= 0 && cv.y >= 0) {
                    // cout << "Yellow";
                    cvColor.r = 1.0;
                    cvColor.g = 1.0;
                    cvColor.b = 0.0;
                }
                // cout << endl;

                view.setDrawColor ( cvColor );
                glVertex3f( (float)cvs[i].x, (float)cvs[i].y, (float)cvs[i].z);
            }
        glEnd();

        glPopAttrib();

        view.endGL();
    }

    bool cvColor::isBounded() const
    {
        return false;
    }

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

    MStatus cvColor::initialize()
    {
        MStatus             stat;
        MFnNumericAttribute numericAttr;
        MFnTypedAttribute   typedAttr;

        drawingEnabled = numericAttr.create( "drawingEnabled", "en",
                                        MFnNumericData::kBoolean, 1, &stat );
        if (!stat) {
            stat.perror("create drawingEnabled attribute");
            return stat;
        }

        pointSize = numericAttr.create( "pointSize", "ps",
                                        MFnNumericData::kFloat, 4.0, &stat );
        if (!stat) {
            stat.perror("create pointSize attribute");
            return stat;
        }

        inputSurface = typedAttr.create( "inputSurface", "is",
                                 MFnNurbsSurfaceData::kNurbsSurface, &stat);
        if (!stat) {
            stat.perror("create inputSurface attribute");
            return stat;
        }

        cvLocations = typedAttr.create( "cvLocations", "cv",
                                 MFnPointArrayData::kPointArray, &stat);
        if (!stat) {
            stat.perror("create cvLocations attribute");
            return stat;
        }

        MPointArray         defaultPoints;
        MFnPointArrayData   defaultArray;
        MObject             defaultAttr;

        defaultPoints.clear(); // Empty array
        defaultAttr = defaultArray.create (defaultPoints);
        stat = typedAttr.setDefault(defaultAttr);
        if (!stat) {
            stat.perror("could not create default output attribute");
            return stat;
        }

        stat = addAttribute (drawingEnabled);
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute (pointSize);
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute (inputSurface);
            if (!stat) { stat.perror("addAttribute"); return stat;}
        stat = addAttribute (cvLocations);
            if (!stat) { stat.perror("addAttribute"); return stat;}

        stat = attributeAffects( inputSurface, cvLocations );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( drawingEnabled, cvLocations );
            if (!stat) { stat.perror("attributeAffects"); return stat;}
        stat = attributeAffects( pointSize, cvLocations );
            if (!stat) { stat.perror("attributeAffects"); return stat;}

        return MS::kSuccess;
    }

    MStatus initializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

        status = plugin.registerNode( "cvColor", cvColor::id,
                             &cvColor::creator, &cvColor::initialize,
                             MPxNode::kLocatorNode );
        if (!status) {
            status.perror("registerNode");
            return status;
        }
        return status;
    }

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

        status = plugin.deregisterNode( cvColor::id );
        if (!status) {
            status.perror("deregisterNode");
            return status;
        }

        return status;
    }