cut.py
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	from Nbody import *
	from Numeric import *

	xm = self.params.get('size')[0]
	zm = self.params.get('size')[1]
	xmin = - xm
	xmax = + xm
	zmin = - zm
	zmax = + zm

	# expose the model
	self.nbodyviewer.pose()

	# keep only particules that are in the window
	self.X = self.X.selectp(self.nbodyviewer.X.num)


	x = self.nbodyviewer.X.pos[:,0]
	z = self.nbodyviewer.X.pos[:,2]

	cx1 = greater(x,xmin)
	cx2 = less(x,xmax)

	cz1 = greater(z,zmin)
	cz2 = less(z,zmax)

	self.X = self.X.selectc(cx1 * cx2 * cz1 * cz2)

	# redisplay
	self.display()
	self.display_info(self.X)