grabUVMain.cpp

// Copyright 2015 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.

// File: pluginMain.cpp
//
// Author: Maya Plug-in Wizard 2.0
//
#include <QtCore/QObject>
#include <QtWidgets/QApplication>
#include <QtCore/QEvent>

#include <maya/MFnPlugin.h>
#include <maya/MIOStream.h>
#include <maya/MStatus.h>     
#include <maya/MEvent.h> 
#include <maya/MGlobal.h>
#include <maya/MItSelectionList.h>
#include <maya/MFnSingleIndexedComponent.h>
#include <maya/MDagPath.h>
#include <maya/MFn.h>
#include <maya/MFnMesh.h>

#include <maya/MPoint.h>
#include <maya/MVector.h>
#include <maya/MMatrix.h>
#include <maya/MIntArray.h>
#include <maya/MFloatArray.h>
#include <maya/MUintArray.h>
#include <maya/MToolsInfo.h>

#include <maya/MUIDrawManager.h>
#include <maya/MFrameContext.h>
#include <maya/MColor.h> 

#include <maya/MPxTexContext.h>
#include <maya/MPxContextCommand.h>
#include <maya/MPxPolyTweakUVInteractiveCommand.h>

class UVUpdateCommand : public MPxPolyTweakUVInteractiveCommand
{
public:
    static void *creator() { return new UVUpdateCommand; };
};

struct BrushConfig
{
    BrushConfig() : fSize(50.0f) {};
    float size() const { return fSize; }
    void setSize( float size ) { fSize = size; }

private:
    float fSize;
};

class grabUVContext : public QObject, public MPxTexContext
{
public:

    // constructor
    grabUVContext();

    // destructor
    virtual ~grabUVContext() {} ;

    virtual void    toolOnSetup( MEvent & event );
    virtual void    toolOffCleanup();

    virtual MStatus doPress ( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context);
    virtual MStatus doRelease( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context);
    virtual MStatus doDrag ( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context); 
    virtual MStatus doPtrMoved ( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context);
    virtual MStatus drawFeedback ( MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context);

    bool            doKeyPress( QKeyEvent* event );
    bool            doKeyRelease( QKeyEvent* event );

    virtual void    getClassName(MString & name) const;

    virtual bool    eventFilter(QObject *object, QEvent *event);

    float   size() const;
    void    setSize( float size );

private:             

    enum DragMode
    {
        kNormal,
        kBrushSize
    };

    BrushConfig     fBrushConfig;
    DragMode        fDragMode;
    bool            fInStroke;

    MPoint          fCurrentPoint;
    MPoint          fLastPoint;
    MPoint          fBrushCenterScreenPoint;
    MPoint          fCurrentScreenPoint;
    MPoint          fLastScreenPoint;
    UVUpdateCommand *fCommand;
    MDagPath        fDagPath;
    MIntArray       fCollectedUVs;
    MGlobal::MSelectionMode fPreviousSelectionMode;
    MSelectionMask  fPreviousSelectionMask;
}; 

grabUVContext::grabUVContext() :
    fCommand(NULL),
    fInStroke(false),
    fDragMode(kNormal)
{

}

float grabUVContext::size() const 
{ 
    return fBrushConfig.size();
}

void grabUVContext::setSize( float size )
{ 
    fBrushConfig.setSize( size ); 
    MToolsInfo::setDirtyFlag(*this); 
}

void grabUVContext::toolOnSetup( MEvent &event )
{
    MPxTexContext::toolOnSetup( event );

    QCoreApplication *app = qApp;
    app->installEventFilter(this);
}

void grabUVContext::toolOffCleanup()
{
    QCoreApplication *app = qApp;
    app->removeEventFilter(this);

    MPxTexContext::toolOffCleanup();
}

bool grabUVContext::eventFilter( QObject * object, QEvent *event )
{
    if( QKeyEvent* e = dynamic_cast<QKeyEvent*>(event) )
    {
        if( e->type() == QEvent::KeyPress )
            doKeyPress( e );
        else if( e->type() == QEvent::KeyRelease )
            doKeyRelease( e );
    }

    // if we return true, the event won't get propagated
    // to the rest of the widgets.
    return false;
}

bool grabUVContext::doKeyPress( QKeyEvent* event )
{
    if( fInStroke )
        return false;

    if( event->key() == Qt::Key_B ) 
    {
        fDragMode = kBrushSize;
        return true;
    }

    return false;
}

bool grabUVContext::doKeyRelease( QKeyEvent* event )
{
    if( fInStroke )
        return false;

    if( fDragMode != kNormal )
    {
        fDragMode = kNormal;
        return true;
    }

    return false;
}
MStatus grabUVContext::doPress ( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context)
{
    if ( event.mouseButton() != MEvent::kLeftMouse || 
        !event.isModifierNone() )
        return MS::kFailure;

    fInStroke = true;

    MPxTexContext::doPress(event, drawMgr, context);

    short x, y;
    event.getPosition( x, y );
    fCurrentScreenPoint = MPoint( x, y );
    fLastScreenPoint = MPoint( x, y );
    fBrushCenterScreenPoint = MPoint( x, y );

    double xView, yView;
    portToView(x, y, xView, yView); // pos at viewrect coordinate  

    double portW, portH;
    portSize(portW, portH);

    double left, right, bottom, top;
    viewRect(left, right, bottom, top);

    double sizeInView = portW < 1e-5 ? 0.0 : ( fBrushConfig.size() * (right - left) / portW );
    double sizeInViewSquare = sizeInView * sizeInView;

    if( fDragMode == kNormal )
    {
        fCollectedUVs.clear();

        MStatus *returnStatus = NULL;
        MSelectionMask mask = MSelectionMask::kSelectMeshUVs;
        const bool bPickSingle = false;
        MSelectionList  selectionList;

        bool bSelect = MPxTexContext::getMarqueeSelection( x - fBrushConfig.size(), y - fBrushConfig.size(), 
                                                           x + fBrushConfig.size(), y + fBrushConfig.size(), 
                                                           mask, bPickSingle, true, selectionList );

        if (bSelect)
        {
            MObject component;
            selectionList.getDagPath( 0, fDagPath, component );
            fDagPath.extendToShape();

            MFnMesh mesh(fDagPath);

            MString currentUVSetName;
            mesh.getCurrentUVSetName(currentUVSetName);

            MIntArray UVsToTest;
            if( component.apiType() == MFn::kMeshMapComponent )
            {
                MFnSingleIndexedComponent compFn( component );
                compFn.getElements( UVsToTest );

                for (unsigned int i = 0; i < UVsToTest.length(); ++i)
                {
                    float u, v;
                    MStatus bGetUV = mesh.getUV(UVsToTest[i], u, v, &currentUVSetName);
                    if (bGetUV == MS::kSuccess)
                    {
                        float distSquare = ( u - xView ) * ( u - xView ) + ( v - yView ) * ( v - yView );
                        if ( distSquare < sizeInViewSquare )
                            fCollectedUVs.append(UVsToTest[i]);
                    }
                }

            }

            // position in view(world) space. 
            fLastPoint = MPoint( xView, yView, 0.0 );
            fCurrentPoint = MPoint( xView, yView, 0.0 );
        }
    }

    return MS::kSuccess;
}

MStatus grabUVContext::doRelease( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context)
{
    fInStroke = false;

    if (fCommand)
        fCommand->finalize();
    fCommand = NULL;

    MPxTexContext::doRelease(event, drawMgr, context);
    return MS::kSuccess;
}

MStatus grabUVContext::doDrag ( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context)
{
    if (event.mouseButton() != MEvent::kLeftMouse || 
        !event.isModifierNone() )
        return MS::kFailure;

    MPxTexContext::doDrag(event, drawMgr, context);

    short x, y;
    event.getPosition( x, y );
    fLastScreenPoint = fCurrentScreenPoint;
    fCurrentScreenPoint = MPoint( x, y );

    double xView, yView;
    portToView(x, y, xView, yView); // pos at viewrect coordinate

    fLastPoint = fCurrentPoint;
    fCurrentPoint = MPoint( xView, yView, 0.0 );

    if( fDragMode == kBrushSize )
    {
        double dis = fCurrentScreenPoint.distanceTo( fLastScreenPoint );
        if ( fCurrentScreenPoint[0] > fLastScreenPoint[0] )
            setSize( size() + float(dis) );
        else
            setSize( std::max( size() - float(dis), 0.01f ) );
    }
    else
    {
        fBrushCenterScreenPoint = MPoint( x, y );

        MFloatArray uUVsExported;
        MFloatArray vUVsExported;

        const MVector vec = fCurrentPoint - fLastPoint;

        if (!fCommand)
        {
            fCommand = (UVUpdateCommand *)(newToolCommand());
        }
        if (fCommand)
        {
            MFnMesh mesh(fDagPath);
            MString currentUVSetName;
            mesh.getCurrentUVSetName(currentUVSetName);

            int nbUVs = mesh.numUVs(currentUVSetName);
            MDoubleArray pinData;
            MUintArray uvPinIds;
            MDoubleArray fullPinData;
            mesh.getPinUVs(uvPinIds, pinData, &currentUVSetName);
            int len = pinData.length();

            fullPinData.setLength(nbUVs);
            for (unsigned int i = 0; i < nbUVs; i++) {
                fullPinData[i] = 0.0;
            }
            while( len-- > 0 ) {
                fullPinData[uvPinIds[len]] = pinData[len];
            }

            MFloatArray uValues;
            MFloatArray vValues;
            float pinWeight = 0;
            for (unsigned int i = 0; i < fCollectedUVs.length(); ++i)
            {
                float u, v;
                MStatus bGetUV = mesh.getUV(fCollectedUVs[i], u, v, &currentUVSetName);
                if (bGetUV == MS::kSuccess)
                {
                    pinWeight = fullPinData[fCollectedUVs[i]];
                    u += (float)vec[0]*(1-pinWeight);
                    v += (float)vec[1]*(1-pinWeight);
                    uValues.append( u );
                    vValues.append( v ); 
                }
            }
            fCommand->setUVs( mesh.object(), fCollectedUVs, uValues, vValues, &currentUVSetName );
        }
    }
    return MS::kSuccess;
}

MStatus grabUVContext::doPtrMoved( MEvent & event, MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context)
{
    MPxTexContext::doPtrMoved(event, drawMgr, context);

    double portW, portH;
    portSize(portW, portH);

    short x, y;
    event.getPosition( x, y );

    y = short(portH) - y;

    fCurrentScreenPoint = MPoint( x, y );
    fLastScreenPoint = MPoint( x, y );
    fBrushCenterScreenPoint = MPoint( x, y );

    return MS::kSuccess;
}

MStatus grabUVContext::drawFeedback(MHWRender::MUIDrawManager& drawMgr, const MHWRender::MFrameContext& context)
{
    // to draw the brush ring.
    drawMgr.beginDrawable();
    {
        drawMgr.setColor( MColor(1.f, 1.f, 1.f) ); 
        drawMgr.setLineWidth( 2.0f );
        drawMgr.circle2d(MPoint(fBrushCenterScreenPoint.x, fBrushCenterScreenPoint.y), fBrushConfig.size());
    }               
    drawMgr.endDrawable();

    return MS::kSuccess;
}

void grabUVContext::getClassName( MString & name ) const
{
    name.set("grabUV");
}

#define kSizeFlag           "-sz"
#define kSizeFlagLong       "-size"

//---------------------------------------------
class grabUVContextCommand : public MPxContextCommand
{
public:  
                        grabUVContextCommand();
    virtual MStatus     doEditFlags();
    virtual MStatus     doQueryFlags();
    virtual MStatus     appendSyntax();
    virtual MPxContext* makeObj();
    static void*        creator();

protected:
    grabUVContext*      fGrabUVContext;
};          

grabUVContextCommand::grabUVContextCommand() {}

MPxContext* grabUVContextCommand::makeObj()
//
// Description
//    When the context command is executed in maya, this method
//    be used to create a context.
//
{
    fGrabUVContext = new grabUVContext();
    return fGrabUVContext;
}

void* grabUVContextCommand::creator()
//
// Description
//    This method creates the context command.
//
{
    return new grabUVContextCommand;
}

MStatus grabUVContextCommand::doEditFlags()
{
    MStatus status = MS::kSuccess;

    MArgParser argData = parser();

    if (argData.isFlagSet(kSizeFlag)) {
        double size;
        status = argData.getFlagArgument(kSizeFlag, 0, size);
        if (!status) {
            status.perror("size flag parsing failed.");
            return status;
        }
        fGrabUVContext->setSize( float(size) );
    }

    return MS::kSuccess;
}

MStatus grabUVContextCommand::doQueryFlags()
{
    MArgParser argData = parser();

    if (argData.isFlagSet(kSizeFlag)) {
        setResult(fGrabUVContext->size());
    }

    return MS::kSuccess;
}

MStatus grabUVContextCommand::appendSyntax()
{
    MSyntax mySyntax = syntax();

    if (MS::kSuccess != mySyntax.addFlag(kSizeFlag, kSizeFlagLong,
        MSyntax::kDouble)) {
            return MS::kFailure;
    }

    return MS::kSuccess;
}

// ------------------------------------------------------------------
#define CTX_CREATOR_NAME "grabUVContext"
#define TEX_COMMAND_NAME "uvUpdateCommand" 

MStatus initializePlugin( MObject obj )
    //
    //  Description:
    //      this method is called when the plug-in is loaded into Maya.  It 
    //      registers all of the services that this plug-in provides with 
    //      Maya.
    //
    //  Arguments:
    //      obj - a handle to the plug-in object (use MFnPlugin to access it)
    //
{ 
    MStatus   status;
    MFnPlugin plugin( obj, "", "2015", "Any");

    // Add plug-in feature registration here
    //
    status = plugin.registerContextCommand(CTX_CREATOR_NAME, grabUVContextCommand::creator,
        TEX_COMMAND_NAME, UVUpdateCommand::creator);

    CHECK_MSTATUS_AND_RETURN_IT(status);

    return status;
}

MStatus uninitializePlugin( MObject obj )
    //
    //  Description:
    //      this method is called when the plug-in is unloaded from Maya. It 
    //      deregisters all of the services that it was providing.
    //
    //  Arguments:
    //      obj - a handle to the plug-in object (use MFnPlugin to access it)
    //
{
    MStatus   status;
    MFnPlugin plugin( obj );

    // Add plug-in feature deregistration here
    //
    status = plugin.deregisterContextCommand(CTX_CREATOR_NAME, TEX_COMMAND_NAME);

    CHECK_MSTATUS_AND_RETURN_IT(status);

    return status;
}