#The MIT License (MIT)
#
#Copyright (c) 2015 Geoffroy Givry
#
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in all
#copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
#SOFTWARE.



import nuke

def cropOverscan():
  
  n = nuke.thisNode()
  if 'Overscan' not in n.knobs():
    overscan_tab = nuke.Tab_Knob('Overscan')
    overscanKnob = nuke.Double_Knob('overscan', 'overscan')
    onlyHorizontalKnob = nuke.Boolean_Knob('onlyH', 'Only Horizontal')
    overscanKnob.setRange(0, 100)
    overscanKnob.setValue(40)
    for k in (overscan_tab, overscanKnob, onlyHorizontalKnob):
      n.addKnob(k)
    onlyHorizontalKnob.clearFlag(nuke.STARTLINE)
    n['box'].setExpression('-overscan',0)
    n['box'].setExpression('onlyH == 1 ? 0 : -overscan',1)
    n['box'].setExpression('width+overscan',2)
    n['box'].setExpression('onlyH == 1 ? height : height + overscan',3)