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#############################################################
## ##
## Copyright (c) 2003-2011 by The University of Queensland ##
## Earth Systems Science Computational Centre (ESSCC) ##
## http://www.uq.edu.au/esscc ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.opensource.org/licenses/osl-3.0.php ##
## ##
#############################################################
"""
Defines classes, instances of which, can be used to generate
spherical grains packed with randomly sized circular particles.
"""
from esys.lsm import Logging
from esys.lsm.util import *
from esys.lsm.geometry.GeometryPy import *
def getLogger():
return Logging.getLogger("esys.lsm.geometry")
class ScaledMinMaxGrainGen(RndGrainGen):
"""
Grain generator which can be used in conjunction with
the L{GougeConfigPrms} and L{GrainRandomBoxPacker} classes.
Generates grains which consist of a particles packed into
a circle/sphere. The minimum and maximum particle radii
are scaled with respect to grain size.
@see: getGrain
"""
def __init__(
self,
minGRadius,
maxGRadius,
do2d=False,
radiusScale=(0.1, 0.4),
maxInsertFails=5000
):
"""
Initialise the generator.
@type minGRadius: float
@param minGRadius: minimum grain radius
@type maxGRadius: float
@param maxGRadius: maximum grain radius
@type do2d: bool
@param do2d: If True, grain particles all occur
on the M{z=0} plane (ie particles packed into
a circle).
@type radiusScale: tuple of two floats
@param radiusScale: Randomly generated spherical
particles will have radii which will lie in the range
C{(radiusScale[0]*minGRadius,radiusScale[1]*maxGRadius)}.
"""
self.do2d = do2d
self.maxInsertFails = maxInsertFails
self.minPRadiusScale = radiusScale[0]
self.maxPRadiusScale = radiusScale[1]
minPRadius = self.minPRadiusScale*minGRadius
maxPRadius = self.maxPRadiusScale*maxGRadius
RndGrainGen.__init__(
self,
minGRadius,
maxGRadius,
minPRadius,
maxPRadius
)
def getGrain(self, p):
"""
Uses L{RandomSpherePacker} to create a grain consisting
of randomly sized particles packed into a sphere with
centre C{p.getPosn()} and radius C{p.getRadius()}. The
random particle radii will lie in the range
C{(self.minPRadiusScale*p.getRadius(),self.maxPRadiusScale*p.getRadius())}
@type p: L{SimpleSphere}
@param p: C{p.getPosn()} and C{p.getRadius()} determine
the size and position of the returned grain.
@rtype: L{Grain}
@return: A I{spherical} grain of randomly sized particles.
"""
minRadius=p.getRadius()*self.minPRadiusScale
packer = \
RandomSpherePacker(
minRadius=minRadius,
maxRadius=p.getRadius()*self.maxPRadiusScale,
cubicPackRadius=p.getRadius()*self.maxPRadiusScale,
maxInsertFails=self.maxInsertFails,
bSphere=BoundingSphere(p.getPosn(), p.getRadius()),
do2d=self.do2d,
tolerance = 0.1*minRadius
)
packer.generate()
g = Grain()
for p in packer.getParticleIterator():
g.createParticle(p)
getLogger().info(
"Created grain of " + str(g.getNumParticles()) + " particles"
)
return g
class ScaledMaxGrainGen(RndGrainGen):
"""
Grain generator which can be used in conjunction with
the L{GougeConfigPrms} and L{GrainRandomBoxPacker} classes.
Generates grains which consist of a particles packed into
a circle/sphere. The maximum particle radius
is scaled with respect to grain size, the minimum
particle radius is independent of grain size.
@see: getGrain
"""
def __init__(
self,
minGRadius,
maxGRadius,
do2d=False,
minPRadius=None,
radiusScale=0.1,
maxInsertFails=5000
):
"""
Initialise the generator.
@type minGRadius: float
@param minGRadius: minimum grain radius
@type maxGRadius: float
@param maxGRadius: maximum grain radius
@type do2d: bool
@param do2d: If True, grain particles all occur
on the M{z=0} plane (ie particles packed into
a circle).
@type minPRadius: float
@param minPRadius: The minimum radius of randomly
generated particles.
@type radiusScale: float
@param radiusScale: Randomly generated spherical
particles will have radii which will lie in the range
C{(minPRadius,radiusScale*maxGRadius)}.
"""
if (minPRadius == None):
minPRadius = minGRadius*0.15
self.do2d = do2d
self.maxInsertFails = maxInsertFails
self.minPRadius = minPRadius
self.maxPRadiusScale = radiusScale
maxPRadius = self.maxPRadiusScale*maxGRadius
RndGrainGen.__init__(
self,
minGRadius,
maxGRadius,
minPRadius,
maxPRadius
)
def getGrain(self, p):
"""
Uses L{RandomSpherePacker} to create a grain consisting
of randomly sized particles packed into a sphere with
centre C{p.getPosn()} and radius C{p.getRadius()}. The
random particle radii will lie in the range
C{(self.minPRadius,self.maxPRadiusScale*p.getRadius())}
@type p: L{SimpleSphere}
@param p: C{p.getPosn()} and C{p.getRadius()} determine
the size and position of the returned grain.
@rtype: L{Grain}
@return: A I{spherical} grain of randomly sized particles.
"""
minRadius = self.minPRadius
maxRadius = p.getRadius()*self.maxPRadiusScale
packer = \
RandomSpherePacker(
minRadius=minRadius,
maxRadius=maxRadius,
cubicPackRadius=maxRadius,
maxInsertFails=self.maxInsertFails,
bSphere=BoundingSphere(p.getPosn(), p.getRadius()),
do2d=self.do2d,
tolerance = 0.1*minRadius
)
packer.generate()
g = Grain()
for p in packer.getParticleIterator():
g.createParticle(p)
getLogger().info(
"Created grain of " + str(g.getNumParticles()) + " particles"
)
return g
class AbsGrainGen(RndGrainGen):
"""
Grain generator which can be used in conjunction with
the L{GougeConfigPrms} and L{GrainRandomBoxPacker} classes.
Generates grains which consist of a particles packed into
a circle/sphere. Spherical particle radii are generated
independent of grain size.
@see: getGrain
"""
def __init__(
self,
minGRadius,
maxGRadius,
do2d=False,
minPRadius=None,
maxPRadius=None,
maxInsertFails=5000
):
"""
Initialise the generator.
@type minGRadius: float
@param minGRadius: minimum grain radius
@type maxGRadius: float
@param maxGRadius: maximum grain radius
@type do2d: bool
@param do2d: If True, grain particles all occur
on the M{z=0} plane (ie particles packed into
a circle).
@type minPRadius: float
@param minPRadius: The minimum radius of randomly
generated particles.
@type maxPRadius: float
@param maxPRadius: The maximum radius of randomly
generated particles.
"""
if (maxPRadius == None):
maxPRadius = maxGRadius*0.4
if (minPRadius == None):
minPRadius = maxPRadius*0.15
self.do2d = do2d
self.maxInsertFails = maxInsertFails
self.minPRadius = minPRadius
self.maxPRadius = maxPRadius
RndGrainGen.__init__(
self,
minGRadius,
maxGRadius,
minPRadius,
maxPRadius
)
def getGrain(self, p):
"""
Uses L{RandomSpherePacker} to create a grain consisting
of randomly sized particles packed into a sphere with
centre C{p.getPosn()} and radius C{p.getRadius()}. The
random particle radii will lie in the range
C{(self.minPRadius,self.maxPRadius)}
@type p: L{SimpleSphere}
@param p: C{p.getPosn()} and C{p.getRadius()} determine
the size and position of the returned grain.
@rtype: L{Grain}
@return: A I{spherical} grain of randomly sized particles.
"""
minRadius = self.minPRadius
maxRadius = self.maxPRadius
packer = \
RandomSpherePacker(
minRadius=minRadius,
maxRadius=maxRadius,
cubicPackRadius=maxRadius,
maxInsertFails=self.maxInsertFails,
bSphere=BoundingSphere(p.getPosn(), p.getRadius()),
do2d=self.do2d,
tolerance = 0.1*minRadius
)
packer.generate()
g = Grain()
for p in packer.getParticleIterator():
g.createParticle(p)
getLogger().info(
"Created grain of " + str(g.getNumParticles()) + " particles"
)
return g
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