//-
// ==========================================================================
// Copyright (C) 1995 - 2005 Alias Systems Corp. and/or its licensors.  All 
// rights reserved. 
// 
// The coded instructions, statements, computer programs, and/or related 
// material (collectively the "Data") in these files are provided by Alias 
// Systems Corp. ("Alias") and/or its licensors for the exclusive use of the 
// Customer (as defined in the Alias Software License Agreement that 
// accompanies this Alias software). Such Customer has the right to use, 
// modify, and incorporate the Data into other products and to distribute such 
// products for use by end-users.
//  
// THE DATA IS PROVIDED "AS IS".  ALIAS HEREBY DISCLAIMS ALL WARRANTIES 
// RELATING TO THE DATA, INCLUDING, WITHOUT LIMITATION, ANY AND ALL EXPRESS OR 
// IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND/OR FITNESS FOR A 
// PARTICULAR PURPOSE. IN NO EVENT SHALL ALIAS BE LIABLE FOR ANY DAMAGES 
// WHATSOEVER, WHETHER DIRECT, INDIRECT, SPECIAL, OR PUNITIVE, WHETHER IN AN 
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, OR IN EQUITY, 
// ARISING OUT OF ACCESS TO, USE OF, OR RELIANCE UPON THE DATA.
// ==========================================================================
//+

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

#include <maya/MIOStream.h>

#include <maya/MPxCommand.h>
#include <maya/MFnPlugin.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>


class zoomCamera : public MPxCommand
{
public:
					zoomCamera() {};
	virtual			~zoomCamera(); 

	MStatus			doIt( const MArgList& args );
	MStatus			redoIt( );
	MStatus			undoIt( );
	bool			isUndoable( ) const;
	
	static void*	creator();

private:
	// This is data that is necessary to redo/undo the command.
	//
	MDagPath		camera;
};

zoomCamera::~zoomCamera() {}

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

MStatus zoomCamera::doIt( const MArgList& )
//
// Description
//     Gets the zoomCamera for the current 3d view and calls
//     the redoIt command to set the focal length.
//
// Note
//     The doit method should collect whatever information is
//     required to do the task, and store it in local class data.
//     It should finally call redoIt to make the command happen.
//
{

	// Get the current zoomCamera
	//
	MStatus stat = M3dView::active3dView().getCamera( camera );	
	
	if ( MS::kSuccess == stat ) {
		redoIt();
	}
	else {
 		cerr << "Error getting camera" << endl;
 	}
	return stat;
}

MStatus zoomCamera::redoIt()
//
// Description
//     Doubles the focal length of current camera
//
// Note
//     The redoIt method should do the actual work, based on the
//     internal data only.
//
{
	MFnCamera fnCamera( camera );
	double fl = fnCamera.focalLength();
	fnCamera.setFocalLength( fl * 2.0 );
	return MS::kSuccess;
}

MStatus zoomCamera::undoIt()
//
// Description
//     the undo routine
//
// Note
//     The undoIt method should undo the actual work, based on the
//     internal data only.
//
{
	MFnCamera fnCamera( camera );
	double fl = fnCamera.focalLength();
	fnCamera.setFocalLength( fl / 2.0 );
	return MS::kSuccess;
}

bool zoomCamera::isUndoable() const
//
// Description
//     Make the command eligable for undo.
//
{ 
	return true;
}


//
// The following routines are used to register/unregister
// the command we are creating within Maya
//
MStatus initializePlugin( MObject obj )
{
	MStatus   status;
	MFnPlugin plugin( obj, "Alias", "3.0", "Any");

	status = plugin.registerCommand( "zoomCamera", zoomCamera::creator );
	if (!status) {
		status.perror("registerCommand");
		return status;
	}

	return status;
}

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

	status = plugin.deregisterCommand( "zoomCamera" );
	if (!status) {
		status.perror("deregisterCommand");
		return status;
	}

	return status;
}