# coding: utf-8
# 2011 ©Bruno Chareyre <bruno.chareyre@grenoble-inp.fr>
"Demonstrate the compression of a periodic cell with non-trivial initial geometry."
from __future__ import print_function
from yade import pack,qt
O.periodic=True

O.cell.hSize=Matrix3(1.0, -0.15, -0.10,
				-0.2 ,1.5, 0.3,
				0.3, -0.3, 1.0)
sp=pack.SpherePack()
num=sp.makeCloud(hSize=O.cell.hSize, rMean=-0.01,rRelFuzz=.2, num=500,periodic=True, porosity=0.52,distributeMass=False)
O.bodies.append([sphere(s[0],s[1]) for s in sp])


O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom()],
		[Ip2_FrictMat_FrictMat_FrictPhys()],
		[Law2_ScGeom_FrictPhys_CundallStrack()]
	),
	#We compress the packing isotropicaly first
	PeriTriaxController( dynCell=True,mass=0.2,maxUnbalanced=0.01, relStressTol=0.01,goal=(-1e4,-1e4,-1e4), stressMask=7,globUpdate=5, maxStrainRate=(1.,1.,1.), doneHook='triaxDone()', label='triax'),
	NewtonIntegrator(damping=.2),
	#PyRunner(iterPeriod=500,command='print "strain: ",triax.strain," stress: ",triax.stress')
]
O.dt=0.5*PWaveTimeStep()
qt.View()

phase=0
def triaxDone():
	global phase
	if phase==0:
		print('Here we are: stress',triax.stress,'strain',triax.strain)
		#Here we reset the transformation, the compressed packing corresponds to null strain
		O.cell.trsf=Matrix3.Identity
		print('Now εxx will go from 0 to .4 while σzz and σyy will be kept the same.')
		triax.stressMask=6
		triax.goal=(-0.4,-1e4,-1e4)

		phase+=1
	elif phase==1:
		print('Here we are: stress',triax.stress,'strain',triax.strain)
		print('Done, pausing now.')
		O.pause()
