footPrintManip/footPrintManip.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.
// ==========================================================================
//+

// 
// DESCRIPTION:
// 
// Produces these dependency graph nodes: "footPrintLocator" and "footPrintLocatorManip".  
//
// This plug-in demonstrates how to use the Show Manip Tool with
// a user-defined manipulator. The user-defined manipulator corresponds to the foot print locator.
//
// This is the script for running this plug-in:
// 
//  loadPlugin footPrintManip;
//  createNode footPrintLocator -n f1;
// 
// To use this plug-in:
//  (1) Create a foot print locator (type createNode footPrintLocator).
//  (2) Select the foot print.
//  (3) Click the Show Manip Tool.
// 

#include <maya/MIOStream.h>

#include <maya/MPxNode.h>   

#include <maya/MPxLocatorNode.h> 

#include <maya/MString.h> 
#include <maya/MTypeId.h> 
#include <maya/MPlug.h>
#include <maya/MVector.h>
#include <maya/MDataBlock.h>
#include <maya/MDataHandle.h>
#include <maya/MColor.h>
#include <maya/M3dView.h>
#include <maya/MFnPlugin.h>
#include <maya/MDistance.h>
#include <maya/MFnUnitAttribute.h>

#include <maya/MFn.h>
#include <maya/MPxNode.h>
#include <maya/MPxManipContainer.h> 
#include <maya/MFnDistanceManip.h> 
#include <maya/MPxContext.h>
#include <maya/MPxSelectionContext.h>

#include <maya/MFnNumericData.h>
#include <maya/MManipData.h>

#include <maya/MEventMessage.h>

// Viewport 2.0
#include <maya/MDrawRegistry.h>
#include <maya/MPxDrawOverride.h>
#include <maya/MUserData.h>
#include <maya/MDrawContext.h>
#include <maya/MHWGeometryUtilities.h>
#include <maya/MPointArray.h>

// Foot Data
//
static float sole[][3] = { {  0.00f, 0.0f, -0.70f},
                           {  0.04f, 0.0f, -0.69f },
                           {  0.09f, 0.0f, -0.65f },
                           {  0.13f, 0.0f, -0.61f }, 
                           {  0.16f, 0.0f, -0.54f },
                           {  0.17f, 0.0f, -0.46f },
                           {  0.17f, 0.0f, -0.35f },
                           {  0.16f, 0.0f, -0.25f },
                           {  0.15f, 0.0f, -0.14f },
                           {  0.13f, 0.0f,  0.00f },
                           {  0.00f, 0.0f,  0.00f },
                           { -0.13f, 0.0f,  0.00f },
                           { -0.15f, 0.0f, -0.14f },
                           { -0.16f, 0.0f, -0.25f },
                           { -0.17f, 0.0f, -0.35f },
                           { -0.17f, 0.0f, -0.46f }, 
                           { -0.16f, 0.0f, -0.54f },
                           { -0.13f, 0.0f, -0.61f },
                           { -0.09f, 0.0f, -0.65f },
                           { -0.04f, 0.0f, -0.69f }, 
                           { -0.00f, 0.0f, -0.70f } }; 
static float heel[][3] = { {  0.00f, 0.0f,  0.06f },
                           {  0.13f, 0.0f,  0.06f },
                           {  0.14f, 0.0f,  0.15f },
                           {  0.14f, 0.0f,  0.21f }, 
                           {  0.13f, 0.0f,  0.25f },
                           {  0.11f, 0.0f,  0.28f },
                           {  0.09f, 0.0f,  0.29f },
                           {  0.04f, 0.0f,  0.30f },
                           {  0.00f, 0.0f,  0.30f },
                           { -0.04f, 0.0f,  0.30f },
                           { -0.09f, 0.0f,  0.29f },
                           { -0.11f, 0.0f,  0.28f }, 
                           { -0.13f, 0.0f,  0.25f },
                           { -0.14f, 0.0f,  0.21f },
                           { -0.14f, 0.0f,  0.15f },
                           { -0.13f, 0.0f,  0.06f },  
                           { -0.00f, 0.0f,  0.06f } }; 
static int heelCount = 17;
static int soleCount = 21;
 

class footPrintLocatorManip : public MPxManipContainer
{
public:
    footPrintLocatorManip();
    ~footPrintLocatorManip() override;
    
    static void * creator();
    static MStatus initialize();
    MStatus createChildren() override;
    MStatus connectToDependNode(const MObject & node) override;

    // Viewport 2.0 manipulator draw overrides
    void        preDrawUI( const M3dView &view ) override;
    void        drawUI( MHWRender::MUIDrawManager& drawManager,
                        const MHWRender::MFrameContext& frameContext) const override;

    MManipData startPointCallback(unsigned index) const;
    MVector nodeTranslation() const;

    MDagPath fDistanceManip;
    MDagPath fNodePath;

    // Value prepared for Viewport 2.0 draw
    MPoint fTextPosition;

public:
    static MTypeId id;
};


MManipData footPrintLocatorManip::startPointCallback(unsigned index) 
const
{
    MFnNumericData numData;
    MObject numDataObj = numData.create(MFnNumericData::k3Double);
    MVector vec = nodeTranslation();
    numData.setData(vec.x, vec.y, vec.z);
    return MManipData(numDataObj);
}


MVector footPrintLocatorManip::nodeTranslation() const
{
    MFnDagNode dagFn(fNodePath);
    MDagPath path;
    dagFn.getPath(path);
    path.pop();  // pop from the shape to the transform
    MFnTransform transformFn(path);
    return transformFn.getTranslation(MSpace::kWorld);
}


MTypeId footPrintLocatorManip::id( 0x8001b );


footPrintLocatorManip::footPrintLocatorManip() 
{ 
    // Do not call createChildren from here 
}


footPrintLocatorManip::~footPrintLocatorManip() 
{
}


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


MStatus footPrintLocatorManip::initialize()
{ 
    MStatus stat;
    stat = MPxManipContainer::initialize();
    return stat;
}


MStatus footPrintLocatorManip::createChildren()
{
    MStatus stat = MStatus::kSuccess;

    MString manipName("distanceManip");
    MString distanceName("distance");

    MPoint startPoint(0.0, 0.0, 0.0);
    MVector direction(0.0, 1.0, 0.0);
    fDistanceManip = addDistanceManip(manipName,
                                      distanceName);
    MFnDistanceManip distanceManipFn(fDistanceManip);
    distanceManipFn.setStartPoint(startPoint);
    distanceManipFn.setDirection(direction);
    
    return stat;
}


MStatus footPrintLocatorManip::connectToDependNode(const MObject &node)
{
    MStatus stat;

    // Get the DAG path
    //
    MFnDagNode dagNodeFn(node);
    dagNodeFn.getPath(fNodePath);

    // Connect the plugs
    //    

    MFnDistanceManip distanceManipFn(fDistanceManip);
    MFnDependencyNode nodeFn(node);    

    MPlug sizePlug = nodeFn.findPlug("size",  true,  &stat);
    if (MStatus::kFailure != stat) {
        distanceManipFn.connectToDistancePlug(sizePlug);
        unsigned startPointIndex = distanceManipFn.startPointIndex();
        addPlugToManipConversionCallback(startPointIndex, 
                                         (plugToManipConversionCallback) 
                                         &footPrintLocatorManip::startPointCallback);

        // also let the user tweak the size via the In-View Editor
        //
        addPlugToInViewEditor( sizePlug );

        finishAddingManips();
        MPxManipContainer::connectToDependNode(node);
    }

    return stat;
}

// Viewport 2.0 manipulator draw overrides
void    footPrintLocatorManip::preDrawUI( const M3dView &view )
{
    // Update text drawing position
    fTextPosition = nodeTranslation();
}

void    footPrintLocatorManip::drawUI(
    MHWRender::MUIDrawManager& drawManager,
    const MHWRender::MFrameContext& frameContext ) const
{
    drawManager.beginDrawable();

    drawManager.setColor( MColor( 0.0f, 1.0f, 0.1f ) );
    drawManager.text( fTextPosition, "Stretch Me!", MHWRender::MUIDrawManager::kLeft );

    drawManager.text2d( MPoint(100,100), "Stretch Me 2D!", MHWRender::MUIDrawManager::kLeft );

    drawManager.endDrawable();
}


class footPrintLocator : public MPxLocatorNode
{
public:
    footPrintLocator();
    ~footPrintLocator() override; 

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

    bool            isBounded() const override;
    MBoundingBox    boundingBox() const override; 

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

    static  MObject         size;         // The size of the foot

public: 
    static  MTypeId     id;
    static  MString     drawDbClassification;
    static  MString     drawRegistrantId;
};


MTypeId footPrintLocator::id( 0x8001c );
MObject footPrintLocator::size;
MString footPrintLocator::drawDbClassification("drawdb/geometry/footPrintLocator");
MString footPrintLocator::drawRegistrantId("FootPrintManipPlugin");

footPrintLocator::footPrintLocator() 
{}


footPrintLocator::~footPrintLocator() 
{}


MStatus footPrintLocator::compute(const MPlug &plug, MDataBlock &data)
{ 
    return MS::kUnknownParameter;
}


bool footPrintLocator::isBounded() const
{ 
    return true;
}


MBoundingBox footPrintLocator::boundingBox() const
{   
    // Get the size
    //
    MObject thisNode = thisMObject();
    MPlug plug(thisNode, size);
    MDistance sizeVal;
    plug.getValue(sizeVal);

    double multiplier = sizeVal.asCentimeters();
 
    MPoint corner1(-0.17, 0.0, -0.7);
    MPoint corner2(0.17, 0.0, 0.3);

    corner1 = corner1 * multiplier;
    corner2 = corner2 * multiplier;

    return MBoundingBox(corner1, corner2);
}


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


MStatus footPrintLocator::initialize()
{ 
    MFnUnitAttribute unitFn;
    MStatus          stat;

    size = unitFn.create("size", "sz", MFnUnitAttribute::kDistance);
    unitFn.setDefault(10.0);
    unitFn.setStorable(true);
    unitFn.setWritable(true);

    stat = addAttribute(size);
    if (!stat) {
        stat.perror("addAttribute");
        return stat;
    }
    
    MPxManipContainer::addToManipConnectTable(id);

    return MS::kSuccess;
}


class FootPrintLocatorData : public MUserData
{
public:
    MColor fColor;
    MPointArray fLineList;
    MPointArray fTriangleList;
};

class FootPrintLocatorDrawOverride : public MHWRender::MPxDrawOverride
{
public:
    static MHWRender::MPxDrawOverride* Creator(const MObject& obj)
    {
        return new FootPrintLocatorDrawOverride(obj);
    }

    ~FootPrintLocatorDrawOverride() override;

    MHWRender::DrawAPI supportedDrawAPIs() const override;

    bool isBounded(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const override;

    MBoundingBox boundingBox(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const override;

    bool disableInternalBoundingBoxDraw() const override;

    MUserData* prepareForDraw(
        const MDagPath& objPath,
        const MDagPath& cameraPath,
        const MHWRender::MFrameContext& frameContext,
        MUserData* oldData) override;

    bool hasUIDrawables() const override { return true; }

    void addUIDrawables(
        const MDagPath& objPath,
        MHWRender::MUIDrawManager& drawManager,
        const MHWRender::MFrameContext& frameContext,
        const MUserData* data) override;

protected:
    MBoundingBox mCurrentBoundingBox;

    MCallbackId fModelEditorChangedCbId;
    MObject fFootPrintLocator;

private:
    FootPrintLocatorDrawOverride(const MObject& obj);
    float getMultiplier(const MDagPath& objPath) const;

    static void OnModelEditorChanged(void *clientData);
};

// By setting isAlwaysDirty to false in MPxDrawOverride constructor, the
// draw override will be updated (via prepareForDraw()) only when the node
// is marked dirty via DG evaluation or dirty propagation. Additional
// callback is also added to explicitly mark the node as being dirty (via
// MRenderer::setGeometryDrawDirty()) for certain circumstances. Note that
// the draw callback in MPxDrawOverride constructor is set to NULL in order
// to achieve better performance.
FootPrintLocatorDrawOverride::FootPrintLocatorDrawOverride(const MObject& obj)
    : MHWRender::MPxDrawOverride(obj, NULL, false)
    , fFootPrintLocator(obj)
{
    fModelEditorChangedCbId = MEventMessage::addEventCallback(
        "modelEditorChanged", OnModelEditorChanged, this);
}

FootPrintLocatorDrawOverride::~FootPrintLocatorDrawOverride()
{
    if (fModelEditorChangedCbId != 0)
    {
        MMessage::removeCallback(fModelEditorChangedCbId);
        fModelEditorChangedCbId = 0;
    }
}

void FootPrintLocatorDrawOverride::OnModelEditorChanged(void *clientData)
{
    // Mark the node as being dirty so that it can update on display mode switch,
    // e.g. between wireframe and shaded.
    FootPrintLocatorDrawOverride *ovr = static_cast<FootPrintLocatorDrawOverride*>(clientData);
    if (ovr) MHWRender::MRenderer::setGeometryDrawDirty(ovr->fFootPrintLocator);
}

MHWRender::DrawAPI FootPrintLocatorDrawOverride::supportedDrawAPIs() const
{
    return MHWRender::kAllDevices;
}

float FootPrintLocatorDrawOverride::getMultiplier(const MDagPath& objPath) const
{
    // Retrieve value of the size attribute from the node
    MStatus status;
    MObject footprintLocatorNode = objPath.node(&status);
    if (status)
    {
        MPlug plug(footprintLocatorNode, footPrintLocator::size);
        if (!plug.isNull())
        {
            MDistance sizeVal;
            if (plug.getValue(sizeVal))
            {
                return (float)sizeVal.asCentimeters();
            }
        }
    }

    return 1.0f;
}

bool FootPrintLocatorDrawOverride::isBounded(const MDagPath& /*objPath*/,
                                      const MDagPath& /*cameraPath*/) const
{
    return true;
}

MBoundingBox FootPrintLocatorDrawOverride::boundingBox(
    const MDagPath& objPath,
    const MDagPath& cameraPath) const
{
    MPoint corner1( -0.17, 0.0, -0.7 );
    MPoint corner2( 0.17, 0.0, 0.3 );

    float multiplier = getMultiplier(objPath);
    corner1 = corner1 * multiplier;
    corner2 = corner2 * multiplier;

    FootPrintLocatorDrawOverride *nonConstThis = (FootPrintLocatorDrawOverride *)this;
    nonConstThis->mCurrentBoundingBox.clear();
    nonConstThis->mCurrentBoundingBox.expand( corner1 );
    nonConstThis->mCurrentBoundingBox.expand( corner2 );

    return mCurrentBoundingBox;
}

bool FootPrintLocatorDrawOverride::disableInternalBoundingBoxDraw() const
{
    return false;
}

MUserData* FootPrintLocatorDrawOverride::prepareForDraw(
    const MDagPath& objPath,
    const MDagPath& cameraPath,
    const MHWRender::MFrameContext& frameContext,
    MUserData* oldData)
{
    // Retrieve data cache (create if does not exist)
    FootPrintLocatorData* data = dynamic_cast<FootPrintLocatorData*>(oldData);
    if (!data)
    {
        data = new FootPrintLocatorData();
    }

    float fMultiplier = getMultiplier(objPath);

    data->fLineList.clear();

    for (int i = 0; i <= soleCount - 2; i++)
    {
        data->fLineList.append(sole[i][0] * fMultiplier, sole[i][1] * fMultiplier, sole[i][2] * fMultiplier);
        data->fLineList.append(sole[i + 1][0] * fMultiplier, sole[i + 1][1] * fMultiplier, sole[i + 1][2] * fMultiplier);
    }

    for (int i = 0; i <= heelCount - 2; i++)
    {
        data->fLineList.append(heel[i][0] * fMultiplier, heel[i][1] * fMultiplier, heel[i][2] * fMultiplier);
        data->fLineList.append(heel[i + 1][0] * fMultiplier, heel[i + 1][1] * fMultiplier, heel[i + 1][2] * fMultiplier);
    }

    data->fTriangleList.clear();

    for (int i = 1; i <= soleCount - 2; i++)
    {
        data->fTriangleList.append(sole[0][0] * fMultiplier, sole[0][1] * fMultiplier, sole[0][2] * fMultiplier);
        data->fTriangleList.append(sole[i][0] * fMultiplier, sole[i][1] * fMultiplier, sole[i][2] * fMultiplier);
        data->fTriangleList.append(sole[i + 1][0] * fMultiplier, sole[i + 1][1] * fMultiplier, sole[i + 1][2] * fMultiplier);
    }

    for (int i = 1; i <= heelCount - 2; i++)
    {
        data->fTriangleList.append(heel[0][0] * fMultiplier, heel[0][1] * fMultiplier, heel[0][2] * fMultiplier);
        data->fTriangleList.append(heel[i][0] * fMultiplier, heel[i][1] * fMultiplier, heel[i][2] * fMultiplier);
        data->fTriangleList.append(heel[i + 1][0] * fMultiplier, heel[i + 1][1] * fMultiplier, heel[i + 1][2] * fMultiplier);
    }

    // compute data and cache it
    data->fColor = MHWRender::MGeometryUtilities::wireframeColor(objPath);

    return data;
}

void FootPrintLocatorDrawOverride::addUIDrawables(
    const MDagPath& objPath,
    MHWRender::MUIDrawManager& drawManager,
    const MHWRender::MFrameContext& frameContext,
    const MUserData* data)
{
    FootPrintLocatorData* pLocatorData = (FootPrintLocatorData*)data;

    drawManager.beginDrawable();

    // Draw the foot print solid/wireframe
    drawManager.setColor( pLocatorData->fColor );
    drawManager.setDepthPriority(5);

    if (frameContext.getDisplayStyle() & MHWRender::MFrameContext::kGouraudShaded) {
        drawManager.mesh(MHWRender::MUIDrawManager::kTriangles, pLocatorData->fTriangleList);
    }

    drawManager.mesh(MHWRender::MUIDrawManager::kLines, pLocatorData->fLineList);

    // Draw a text "Foot"
    MPoint pos( 0.0, 0.0, 0.0 ); // Position of the text
    MColor textColor( 0.1f, 0.8f, 0.8f, 1.0f ); // Text color

    drawManager.setColor( textColor );
    drawManager.setFontSize( MHWRender::MUIDrawManager::kSmallFontSize );
    drawManager.text( pos,  MString("FootprintLocator"), MHWRender::MUIDrawManager::kCenter );

    drawManager.endDrawable();
}

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

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

    status = MHWRender::MDrawRegistry::registerDrawOverrideCreator(
        footPrintLocator::drawDbClassification,
        footPrintLocator::drawRegistrantId,
        FootPrintLocatorDrawOverride::Creator);
    if (!status) {
        status.perror("registerDrawOverrideCreator");
        return status;
    }
    
    
    status = plugin.registerNode("footPrintLocatorManip", 
                                 footPrintLocatorManip::id, 
                                 &footPrintLocatorManip::creator, 
                                 &footPrintLocatorManip::initialize,
                                 MPxNode::kManipContainer);
    if (!status) {
        status.perror("registerNode");
        return status;
    }

    return status;
}


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

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

    status = MHWRender::MDrawRegistry::deregisterDrawOverrideCreator(
        footPrintLocator::drawDbClassification,
        footPrintLocator::drawRegistrantId);
    if (!status) {
        status.perror("deregisterNode");
        return status;
    }

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

    return status;
}