template/zoomCameraTemplate/zoomCameraTemplate.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.
// ==========================================================================
//+

//
//  Description:
//      - doubles the focal length for the camera of the
//        current 3d view
//

#include <maya/MTemplateCommand.h>

#include <maya/MString.h>
#include <maya/MArgList.h>

#include <maya/MFnCamera.h>
#include <maya/MGlobal.h>
#include <maya/M3dView.h>
#include <maya/MDagPath.h>

#include <maya/MIOStream.h>

class zoomCameraTemplate;
char cmdName[] = "zoomCameraTemplate";

class zoomCameraTemplate : public MTemplateCommand<zoomCameraTemplate,cmdName, MTemplateCommand_nullSyntax >
{
public:
    //
    zoomCameraTemplate()
    {}

    //
    ~zoomCameraTemplate() override
    {}

    //
    MStatus doIt( const MArgList& ) override
    {
        MStatus stat = M3dView::active3dView().getCamera( camera );         
        if ( MS::kSuccess == stat ) {
            redoIt();
        }
        else {
            cerr << "Error getting camera" << endl;
        }
        return stat;
    }

    //
    MStatus redoIt() override
    {
        MFnCamera fnCamera( camera );
        double fl = fnCamera.focalLength();
        fnCamera.setFocalLength( fl * 2.0 );
        return MS::kSuccess;
    }

    //
    MStatus undoIt() override
    {
        MFnCamera fnCamera( camera );
        double fl = fnCamera.focalLength();
        fnCamera.setFocalLength( fl / 2.0 );
        return MS::kSuccess;
    }

private:
    MDagPath camera;
};

static zoomCameraTemplate _zoom;

//
//  Entry points
//

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

    status = _zoom.registerCommand( obj );
    if (!status) 
    {
        status.perror("registerCommand");
        return status;
    }

    return status;
}

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

    status = _zoom.deregisterCommand( obj );
    if (!status) 
    {
        status.perror("deregisterCommand");
        return status;
    }

    return status;
}