#==============================================================================
#
# Project:   SharpImage
# Module:    ZeroCrossing.py
# Language:  IronPython
# Author:    Dan Mueller
# $Date: 2007-07-06 10:57:00 +1000 (Fri, 06 Jul 2007) $
# $Revision: 2 $
#
# Copyright (c) Queensland University of Technology (QUT) 2007.
# All rights reserved.
#
# This software is distributed WITHOUT ANY WARRANTY; without even
# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the above copyright notices for more information.
#
#==============================================================================

# Import the base script class
import ImageToImageScript
from ImageToImageScript import *

# Add reference and import Edges library
clr.AddReference("ManagedITK.EdgeFilters")
from itk import *

class ZeroCrossingScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "ZeroCrossing"
    Help = """Finds the closest pixel to the zero-crossings (sign changes) in the input image."""
    Parameters = """(pixel) ForegroundValue = the output foreground value. (255.0)
                    (pixel) BackgroundValue = the output background value. (0.0)"""
    ForegroundValue = 255.0
    BackgroundValue = 0.0
    # -------------------------------------------------------------------------

    def ThreadedDoWork(self):
        """ Perform the main functions of the script on a background thread. """
        try:
            self.StartedWork()
            self.WriteInputName()
            filterZeroCrossing = itkZeroCrossingImageFilter.New( self.Input, self.Output )
            self.AddEventHandlersToProcessObject( filterZeroCrossing )
            filterZeroCrossing.SetInput( self.Input )
            filterZeroCrossing.ForegroundValue = itkPixel( self.Output.PixelType, self.ForegroundValue )
            filterZeroCrossing.BackgroundValue = itkPixel( self.Output.PixelType, self.BackgroundValue )
            self.WriteLineToConsole( "ForegroundValue=" + self.ForegroundValue.ToString() )
            self.WriteLineToConsole( "BackgroundValue=" + self.BackgroundValue.ToString() )
            filterZeroCrossing.UpdateLargestPossibleRegion()
            filterZeroCrossing.GetOutput( self.Output )
            self.DisconnectInputAndOutput()
            self.DisposeOfObject( filterZeroCrossing )
            self.WriteOutputName()
            self.FinishedWork( True )
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )