lineManipContainer/lineManipContainer.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.
// ==========================================================================
//+

//
// This example is based on the lineManip.cpp example but
// incorporates a manip container so that two lines can
// be created as children.  The left line will change
// translateX of the selected nodes.  The right line
// will change scaleX of the selected node.  
 
/*
    // To show this example using MEL, run the following:

    loadPlugin lineManipContainer;
    lineManipContainerContext lineManipContainerContext1;
    setParent Shelf1;
    toolButton -cl toolCluster
                -i1 "moveManip.xpm"
                -t lineManipContainerContext1
                lineManipContainer1;

    If the preceding commands were used to create the manipulator context, 
    the following commands can destroy it:

        deleteUI lineManipContainerContext1;
        deleteUI lineManipContainer1;

*/

#include "lineManipContainer.h"

#include <maya/MIOStream.h>
#include <maya/MMatrix.h>
#include <maya/MPoint.h>
#include <maya/MVector.h>
#include <maya/MSelectionList.h>
#include <maya/MItSelectionList.h>
#include <maya/MFnTransform.h>
#include <maya/MGlobal.h>
#include <maya/MFnCamera.h>
#include <maya/MTemplateManipulator.h>

// Statics
MTypeId lineManip::id( 0x81049 );
MTypeId lineManipContainer::id( 0x8104A );

// Utility class for returning line points
class lineGeometry
{
public:
    static MPoint topPoint( bool rightLine = true ) {
        if ( rightLine )
            return MPoint( 1.0f, 1.0f, 0.0f );
        return MPoint( -1.0f, 1.0f, 0.0f );
    }
    static MPoint bottomPoint( bool rightLine = true ) {
        if ( rightLine )
            return MPoint( 1.0f, -1.0f, 0.0f );
        return MPoint( -1.0f, -1.0f, 0.0f );
    }
    static MPoint otherPoint() {
        return MPoint( 2.0f, -1.0f, 0.0f );
    }
};

//
// class implementation
//
lineManip::lineManip()
{
    // Setup the plane with a point on the
    // plane along with a normal
    MPoint pointOnPlane(lineGeometry::topPoint());
    // Normal = cross product of two vectors on the plane
    MVector normalToPlane = (MVector(lineGeometry::topPoint()) - MVector(lineGeometry::otherPoint())) ^ 
                    (MVector(lineGeometry::otherPoint()) - MVector(lineGeometry::bottomPoint()));
    // Necessary to normalize
    normalToPlane.normalize();
    plane.setPlane( pointOnPlane, normalToPlane );

    // default case
    affectScale = affectTranslate = false;
}

lineManip::~lineManip()
{
    // No-op
}

void lineManip::postConstructor()
{
    glFirstHandle(lineName);
}

//virtual 
void lineManip::preDrawUI( const M3dView &view )
{
    // Initial as draw manipulator in vp2
    fDrawManip = true;

    // Are we in the right view
    M3dView *viewPtr = const_cast<M3dView*>( &view );
    MDagPath dpath;
    viewPtr->getCamera(dpath);
    MFnCamera viewCamera(dpath);
    const char *nameBuffer = viewCamera.name().asChar();
    if ( 0 == nameBuffer )
        fDrawManip = false;
    if ( ( 0 == strstr(nameBuffer,"persp") ) && ( 0 == strstr(nameBuffer,"front") ) )
        fDrawManip = false;

    if ( !fDrawManip )
        return;

    // Populate the point arrays which are in local space
    // Return values change with setting of rightLine
    // boolean
    float top[4], bottom[4];
    getManipLinePos(top, bottom);

    fLineStart = MPoint(top);
    fLineEnd = MPoint(bottom);
}

//virtual 
void lineManip::drawUI(MHWRender::MUIDrawManager& drawManager, const MHWRender::MFrameContext& frameContext) const
{
    if(!fDrawManip)
        return;

    drawManager.beginDrawable(MHWRender::MUIDrawManager::kSelectable, lineName);
    setHandleColor(drawManager, lineName, mainColor());
    drawManager.line(fLineStart, fLineEnd);
    drawManager.endDrawable();
}

// virtual 
MStatus lineManip::doPress( M3dView& view )
{
    // Reset the mousePoint information on
    // a new press
    mousePointGlName = MPoint::origin;
    updateDragInformation();
    return MS::kSuccess;
}

// virtual
MStatus lineManip::doDrag( M3dView& view )
{
    updateDragInformation();
    return MS::kSuccess;
}

// virtual
 MStatus lineManip::doRelease( M3dView& view )
{
    // Scale nodes on the selection list
    // No undo supported
    MSelectionList list;
    MGlobal::getActiveSelectionList( list );
    for ( MItSelectionList iter( list ); !iter.isDone(); iter.next() ) 
    {
        MObject node;
        MStatus status;
            iter.getDependNode( node );
        MFnTransform xform( node, &status );
        if ( MS::kSuccess == status )
        {
            if ( affectScale )
            {
                double newScale[3];
                newScale[0] = mousePointGlName.x + 1;
                newScale[1] = mousePointGlName.y + 1;
                newScale[2] = mousePointGlName.z + 1;
                xform.setScale( newScale );
            }
            if ( affectTranslate )
            {
                double newTranslate[3];
                newTranslate[0] = mousePointGlName.x;
                newTranslate[1] = mousePointGlName.y;
                newTranslate[2] = mousePointGlName.z;
                xform.setTranslation( newTranslate, MSpace::kObject );
            }
        }
    }
    return MS::kSuccess;
}

 // Utility method for finding the mouse delta
MStatus lineManip::updateDragInformation()
{
    // Find the mouse point in local space
    MPoint localMousePoint;
    MVector localMouseDirection;
    if ( MS::kFailure == mouseRay( localMousePoint, localMouseDirection) )
        return MS::kFailure;

    // Find the intersection of the mouse point with the
    // manip plane
    MPoint mouseIntersectionWithManipPlane;
    if ( ! plane.intersect( localMousePoint, localMouseDirection,   mouseIntersectionWithManipPlane ) )
        return MS::kFailure;

    mousePointGlName = mouseIntersectionWithManipPlane;

    MGLuint active = 0;
    if ( glActiveName( active ) )
    {
        float start[4] = {0,0,0,0},end[4] = {0,0,0,0};
        if ( active == lineName )
        {
            //
            bool rightLine = true;
            if ( affectTranslate )
                    rightLine = false;

            lineGeometry::topPoint(rightLine).get(start);
            lineGeometry::bottomPoint(rightLine).get(end);
        }

        if ( active != 0 )
        {
            lineMath line;
            // Find a vector on the plane
            MPoint a( start[0], start[1], start[2] );
            MPoint b( end[0], end[1], end[2] );
            MPoint vab = a - b;
            // Define line with a point and a vector on the plane
            line.setLine( start, vab );
            MPoint cpt;
            // Find the closest point so that we can get the
            // delta change of the mouse in local space
            if ( line.closestPoint( mousePointGlName, cpt ) )
            {
                mousePointGlName.x -= cpt.x;
                mousePointGlName.y -= cpt.y;
                mousePointGlName.z -= cpt.z;
            }
        }
    }
    return MS::kFailure;
}

// Get the line position of this manip
void lineManip::getManipLinePos(float* top, float* bottom)
{
    bool rightLine = true;
    if ( affectTranslate )
        rightLine = false;

    lineGeometry::topPoint(rightLine).get(top);
    lineGeometry::bottomPoint(rightLine).get(bottom);

    // Depending on what's active, we modify the
    // end points with mouse deltas in local
    // space
    MGLuint active = 0;
    if(glActiveName(active))
    {
        if(active && active == lineName)
        {
            top[0] += (float) mousePointGlName.x; 
            top[1] += (float) mousePointGlName.y; 
            top[2] += (float) mousePointGlName.z;

            bottom[0] += (float) mousePointGlName.x; 
            bottom[1] += (float) mousePointGlName.y; 
            bottom[2] += (float) mousePointGlName.z;
        }
    }
}

//
// Manip container
//

lineManipContainer::lineManipContainer() 
{ 
    // No-op
}


lineManipContainer::~lineManipContainer() 
{
    // No-op
}

// Make the children manipulators: left and
// right lines
MStatus lineManipContainer::createChildren()
{
    MStatus status;

    MPxManipulatorNode *proxyManip = 0;

    MString manipTypeName("singleLineManip");
    MString manipName("rightLineManip");
    status = addMPxManipulatorNode( manipTypeName, manipName, proxyManip );
    if ( !status )
    {
        return MS::kFailure;
    }

    lineManip *rightManipPtr = (lineManip *) proxyManip;
    if ( rightManipPtr )
    {
        rightManipPtr->affectScale = true;
    }

    proxyManip = 0;
    manipTypeName = "singleLineManip";
    manipName = "leftLineManip";
    status = addMPxManipulatorNode( manipTypeName, manipName, proxyManip );
    if ( !status )
    {
        return MS::kFailure;
    }

    lineManip *leftManipPtr = (lineManip *) proxyManip;
    if ( leftManipPtr )
    {
        leftManipPtr->affectTranslate = true;
    }

    return status;
}


MStatus lineManipContainer::connectToDependNode(const MObject &node)
{
    // No-op
    return MS::kSuccess;
}

//
// lineManipContainerContext: implemented as a template
//

class lineManipContainerContext;
char contextName[] = "lineManipContainerContext";
char manipulatorContainerNodeName[] = "lineManipContainer";

class lineManipContainerContext : 
    public MTemplateSelectionContext<contextName, lineManipContainerContext, 
        MFn::kTransform, lineManipContainer, manipulatorContainerNodeName >
{
public:
    lineManipContainerContext() {}
    ~lineManipContainerContext() override {}

    void namesOfAttributes(MStringArray& namesOfAttributes) override
    {
        namesOfAttributes.append("scaleX");
        namesOfAttributes.append("translateX");
    }
};

//
//  lineManipContainerContextCommand: implemented as a template
//

class lineManipContainerContextCommand;
char contextCommandName[] = "lineManipContainerContext";

class lineManipContainerContextCommand : 
    public MTemplateContextCommand<contextCommandName, lineManipContainerContextCommand, lineManipContainerContext >
{
public:
    lineManipContainerContextCommand() {}
    ~lineManipContainerContextCommand() override {}
};

static lineManipContainerContextCommand _lineManipContainerContextCommand;

//
// Static methods
//

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

MStatus lineManip::initialize()
{
    return MS::kSuccess;
}

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


MStatus lineManipContainer::initialize()
{ 
    MStatus status;
    status = MPxManipContainer::initialize();
    return status;
}


//
//  Entry points
//

MStatus initializePlugin( MObject obj )
{ 
    MStatus   status;
    MFnPlugin plugin( obj, PLUGIN_COMPANY, "2009", "Any");

    status = plugin.registerNode( "singleLineManip", lineManip::id, lineManip::creator,
        lineManip::initialize, MPxNode::kManipulatorNode );
    if (!status) 
    {
        status.perror("registerNode");
        return status;
    }

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

    status = _lineManipContainerContextCommand.registerContextCommand( obj );
    if (!status) 
    {
        status.perror("registerContextCommand");
        return status;
    }

    return status;
}

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

    status = plugin.deregisterNode( lineManip::id );
    if (!status) 
    {
        status.perror("deregisterNode");
        return status;
    }
    status = plugin.deregisterNode(lineManipContainer::id);;
    if (!status) 
    {
        status.perror("deregisterNode");
        return status;
    }
    status = _lineManipContainerContextCommand.deregisterContextCommand( obj );
    if (!status) 
    {
        status.perror("deregisterContextCommand");
        return status;
    }

    return status;
}