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# zoomCameraCmd.py

    #-
    # ==========================================================================
    # Copyright (C) 1995 - 2006 Autodesk, Inc. and/or its licensors.  All
    # rights reserved.
    #
    # The coded instructions, statements, computer programs, and/or related
    # material (collectively the "Data") in these files contain unpublished
    # information proprietary to Autodesk, Inc. ("Autodesk") and/or its
    # licensors, which is protected by U.S. and Canadian federal copyright
    # law and by international treaties.
    #
    # The Data is provided for use exclusively by You. You have the right
    # to use, modify, and incorporate this Data into other products for
    # purposes authorized by the Autodesk software license agreement,
    # without fee.
    #
    # The copyright notices in the Software and this entire statement,
    # including the above license grant, this restriction and the
    # following disclaimer, must be included in all copies of the
    # Software, in whole or in part, and all derivative works of
    # the Software, unless such copies or derivative works are solely
    # in the form of machine-executable object code generated by a
    # source language processor.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
    # AUTODESK DOES NOT MAKE AND HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED
    # WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF
    # NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
    # PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE, OR
    # TRADE PRACTICE. IN NO EVENT WILL AUTODESK AND/OR ITS LICENSORS
    # BE LIABLE FOR ANY LOST REVENUES, DATA, OR PROFITS, OR SPECIAL,
    # DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES, EVEN IF AUTODESK
    # AND/OR ITS LICENSORS HAS BEEN ADVISED OF THE POSSIBILITY
    # OR PROBABILITY OF SUCH DAMAGES.
    #
    # ==========================================================================
    #+

    # import maya.cmds
    # maya.cmds.loadPlugin("zoomCameraCmd.py")
    # maya.cmds.spZoomCamera()

    import sys
    import maya.OpenMaya as OpenMaya
    import maya.OpenMayaUI as OpenMayaUI
    import maya.OpenMayaMPx as OpenMayaMPx

    kPluginCmdName = "spZoomCamera"

    print "zoomCameraCmd.py has been imported...."

    # command
    class scriptedCommand(OpenMayaMPx.MPxCommand):
        camera = OpenMaya.MDagPath()
        def __init__(self):
            OpenMayaMPx.MPxCommand.__init__(self)

        def redoIt(self):
            global camera
            fnCamera = OpenMaya.MFnCamera(camera)
            f1 = fnCamera.focalLength()
            fnCamera.setFocalLength(f1 * 2.0)

        def undoIt(self):
            global camera
            fnCamera = OpenMaya.MFnCamera(camera)
            f1 = fnCamera.focalLength()
            fnCamera.setFocalLength(f1 / 2.0)

        def doIt(self, args):
            global camera
            camera = OpenMaya.MDagPath()
            try:
                OpenMayaUI.M3dView.active3dView().getCamera(camera)
            except:
                sys.stderr.write( "ERROR: getting camera \n" )
            else:
                self.redoIt()

        def isUndoable(self):
            return True

    #Cmd Creator
    def cmdCreator():
        return OpenMayaMPx.asMPxPtr( scriptedCommand() )

    # Initialize the script plug-in
    def initializePlugin(obj):
        plugin = OpenMayaMPx.MFnPlugin(obj)
        try:
            plugin.registerCommand( kPluginCmdName, cmdCreator)
        except:
            sys.stderr.write( "Failed to register command: %s\n" % kPluginCmdName )

    # Uninitialize the script plug-in
    def uninitializePlugin(obj):
        plugin = OpenMayaMPx.MFnPlugin(obj)
        try:
            plugin.deregisterCommand(kPluginCmdName)
        except:
            sys.stderr.write( "Failed to unregister command: %s\n" % kPluginCmdName )