#==============================================================================
#
# Project:   SharpImage
# Module:    ExtractComponent.py
# Language:  IronPython
# Author:    Dan Mueller
# Date:      $Date: 2007-07-06 10:57:00 +1000 (Fri, 06 Jul 2007) $
# Revision:  $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 relevent class
import ImageToImageScript
from ImageToImageScript import *

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

class ExtractComponentScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "ExtractComponent"
    Help = """Extracts a component from a vector image."""
    Parameters = """(int) Index = the index of the component to extract. (0)"""
    Index = 0
    # -------------------------------------------------------------------------

    def Initialise(self):
        """ Initialise the environment for running this script. """
        """ NOTE: This function is invoked on the main UI thread. """
        try:
            ThreadedScriptObject.Initialise( self )
            self.Renderer = self.ParentApplication.CurrentRenderer
            self.Input = self.Renderer.Inputs[0]
            outputPixelType = itkPixelType( self.Input.PixelType.TypeAsEnum )
            self.Output = itkImage.New( outputPixelType, self.Input.Dimension )
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            ScriptObject.Finalise( self )

    def ThreadedDoWork(self):
        """ Perform the main functions of the script on a background thread. """
        try:
            self.StartedWork()
            
            # Setup and run the filter
            filterExtract = itkVectorIndexSelectionCastImageFilter.New( self.Input, self.Output )
            self.AddEventHandlersToProcessObject( filterExtract )
            filterExtract.SetInput( self.Input )
            filterExtract.Index = self.Index
            self.WriteLineToConsole( "Index=" + self.Index.ToString() )
            filterExtract.UpdateLargestPossibleRegion()
            filterExtract.GetOutput( self.Output )

            # Clean up and return
            self.DisconnectInputAndOutput()
            self.DisposeOfObject( filterExtract )
            self.WriteOutputName()
            self.FinishedWork( True )
            
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )