#==============================================================================
#
# Project:   SharpImage
# Module:    ShiftScale.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 base script class
import ImageToImageScript
from ImageToImageScript import *

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

class ShiftScaleScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "ShiftScale"
    Help = """Applies a linear transformation by firstly adding Shift to each
              pixel, then multiplying each pixel by Scale. This filter works
              for both scalar and array pixels."""
    Parameters = """(double) Shift = the amount to shift (0.0)
                    (double) Scale = the scale factor (1.0)"""
    Shift = 0.0
    Scale = 1.0
    # -------------------------------------------------------------------------

    def ThreadedDoWork(self):
        """ Perform the main functions of the script. """
        """ NOTE: This function is invoked on a background thread. """
        try:
            self.StartedWork()
            self.WriteInputName()
            filterShiftScale = None
            if (self.Input.PixelType.IsArray):
                filterShiftScale = itkVectorShiftScaleImageFilter.New( self.Input, self.Output )
            else:
                filterShiftScale = itkShiftScaleImageFilter.New( self.Input, self.Output )
            self.AddEventHandlersToProcessObject( filterShiftScale )
            filterShiftScale.SetInput( self.Input )
            filterShiftScale.Shift = self.Shift
            filterShiftScale.Scale = self.Scale
            self.WriteLineToConsole( "Shift=" + self.Shift.ToString() )
            self.WriteLineToConsole( "Scale=" + self.Scale.ToString() )
            filterShiftScale.UpdateLargestPossibleRegion()
            filterShiftScale.GetOutput( self.Output )
            self.DisconnectInputAndOutput()
            self.DisposeOfObject( filterShiftScale )
            self.WriteOutputName()
            self.FinishedWork( True )
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )