#==============================================================================
#
# Project:   SharpImage
# Module:    ThresholdWithForm.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 SlicePipelineScript
from SlicePipelineScript import *

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

class ThresholdWithFormScript(SlicePipelineScriptObject):
    # -------------------------------------------------------------------------
    Name = "ThresholdWithForm"
    Help = """Sets image values to OutsideValue if they are outside specified values.
              This filter sets image values to OutsideValue (eg. black) if the image values
              are outside of the range [Lower..Upper]. The Lower and Upper parameters are
              specified using sliders."""
    Parameters = """(pixel) OutsideValue = the output value if outside thresholds. (0)
                    (double) SliderMinimum = the minimum slider value. (min)
                    (double) SliderMaximum = the maximum slider value. (max)
                    (double) Increment = slider value increment. (1.0)"""
    OutsideValue = None
    SliderMinimum = None
    SliderMaximum = None
    Increment = 1.0
    Filter = None
    Form = None
    Variables = None
    # -------------------------------------------------------------------------

    def AddVariablesToForm(self):
        """ Add the required variables to the form. """
        # Setup InsideValue and OutsideValue
        image = self.Renderer.Inputs[0]
        pixelType = image.PixelType
        if (self.OutsideValue == None):
            self.OutsideValue = 0

        # Setup SliderMinimum and SliderMaximum
        if (self.SliderMinimum != None and self.SliderMinimum != None):
            # Do nothing - keep the user specified values
            self.SliderMinimum
            self.SliderMaximum
        elif (image.Metadata.ContainsKey("MinimumValueAsD") and image.Metadata.ContainsKey("MaximumValueAsD")):
            # Use the image min/max values
            self.SliderMinimum = image.Metadata["MinimumValueAsD"]
            self.SliderMaximum = image.Metadata["MaximumValueAsD"]
        else:
            # Use the pixel min/max values
            self.SliderMinimum = pixelType.MinValue
            self.SliderMaximum = pixelType.MaxValue

        # Add variables
        self.Form.AddVariable( "Lower", self.SliderMinimum, self.SliderMinimum, self.SliderMaximum, self.Increment )
        self.Form.AddVariable( "Upper", self.SliderMaximum, self.SliderMinimum, self.SliderMaximum, self.Increment )

    def CreatePipeline(self, isSlice):
        """
        Set self.Pipeline to an instance of an itkPipeline.
        If isSlice is True the events are watched, otherwise events are NOT watched.
        """
        self.Pipeline = itkThresholdImageFilter.New( self.Input )
        if (isSlice):
            self.Pipeline.RemoveAllObservers( )
        else:
            self.AddEventHandlersToProcessObject( self.Pipeline )

    def ApplyPipeline(self, isSlice):
        """
        Apply self.Pipeline by setting the input, setting the filter parameters
        (stored in self.Variables), updating the pipeline, getting the output, and
        disconnecting the inputs and outputs.
        If isSlice is True the pipeline is being applied to the current slice only,
        otherwise the pipeline is being applied to whole image (eg. a 2D or 3D image).
        """
        # Check the pipeline was not null
        if (self.Pipeline == None):
            return

        # Setup the pipeline inputs and parameters
        self.Pipeline.SetInput( self.Input )
        self.Pipeline.OutsideValue = itkPixel( self.Output.PixelType, self.OutsideValue )
        pixelLower = itkPixel( self.Output.PixelType, self.Variables["Lower"] )
        pixelUpper = itkPixel( self.Output.PixelType, self.Variables["Upper"] )
        self.Pipeline.ThresholdOutside( pixelLower, pixelUpper )

        # Write the parameters if not isSlice
        if (not isSlice):
            self.WriteLineToConsole( "Lower=" + pixelLower.ToString() )
            self.WriteLineToConsole( "Upper=" + pixelUpper.ToString() )
            self.WriteLineToConsole( "OutsideValue=" + self.Pipeline.OutsideValue.ToString() )

        # Update the pipeline and get output
        self.Pipeline.Update( )
        self.Pipeline.GetOutput( self.Output )

        # Disconnect inputs/outputs
        self.DisconnectInputAndOutput( )

    def VariableChangedHandler(self, name, variables):
        """ Handle the Form.VariableChangedHandler event. """
        if (name == "Lower" and variables["Lower"] > variables["Upper"]):
            variables["Upper"] = variables["Lower"]
        elif (name == "Upper" and variables["Lower"] > variables["Upper"]):
            variables["Lower"] = variables["Upper"]
        self.Variables = variables
        self.ApplyPipeline( True )
        self.ShowOutputAsCurrentSlice( )