#=========================================================================
#
#  Copyright Insight Software Consortium
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0.txt
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
#=========================================================================
require 'simpleitk'

if ARGV.length != 3 then
  puts "Usage: SimpleGaussian <input> <sigma> <output>";
  exit( 1 )
end

## [ruby director command]
# Derive a class from SimpleITK Command class to be used to observe
# events and report progress.
class MyCommand < Simpleitk::Command
  def initialize(po)
    # Explicit call to supoer class initlaizer is required to
    # initialize the SWIG director class to enable overloaded methods
    super()
    @po = po
  end

  # The Command method to be executed on the event from the filter.
  def execute
    puts "%s Progress: %0.2f" % [@po.get_name, @po.get_progress]
  end
end
## [ruby director command]

reader = Simpleitk::ImageFileReader.new
reader.set_file_name( ARGV[0] )
image = reader.execute

inputPixelType = image.get_pixel_idvalue


gaussian = Simpleitk::DiscreteGaussianImageFilter.new
gaussian.set_variance ARGV[1].to_f

# create a new MyCommand class, the references between the objects is
# automatically taked care of. The connection will automatically be
# removed when either object is deleted.
cmd = MyCommand.new gaussian
gaussian.add_command Simpleitk::SitkProgressEvent, cmd

image = gaussian.execute image

caster = Simpleitk::CastImageFilter.new
caster.set_output_pixel_type inputPixelType
image = caster.execute image

writer = Simpleitk::ImageFileWriter.new
writer.set_file_name ARGV[2]
writer.execute image
