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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 ##
## ##
#############################################################
#!/bin/env python
import sys
import string
from math import sqrt
from optparse import OptionParser
from esys.lsm.util import InstallInfo
if (InstallInfo.haveVtk()):
from esys.lsm.vis.vtk import *
class Data:
"""
Objects store position and displacement vectors.
"""
def __init__(self, point, displacement):
"""
Initialise data.
@type point: 3 element sequence of floats
@param point: position of displacement.
@type displacement: 3 element sequence of floats
@param displacement: displacement at point.
"""
self.point = point
self.displacement = displacement
def getPoint(self):
"""
Returns position.
@return: data position
@rtype: 3 element sequence of floats
"""
return self.point
def getDisplacement(self):
"""
Returns displacement.
@return: data displacement
@rtype: 3 element sequence of floats
"""
return self.displacement
def getDisplacementMagnitude(self):
"""
Returns displacement magnitude.
@rtype: float
@return: magnitude of seld.getDisplacement() vector
"""
return \
sqrt(
sum(
map(lambda x:x*x, self.displacement)
)
)
def surfaceRenderDisplacements(fileName, zField, subsample, scaleMultiplier, imageSize):
"""
Renders a surface of displacements data.
@param fileName: name of the data file.
@type zField: string C{in ["dx", "dy", "dm", "vx", "vy", "vm"]}.
@param zField: Which component of the data is used for
the surface heights.
@type subsample: int C{>= 1}
@param subsample: A subset of data is rendered for C{subsample > 1}.
@type scaleMultiplier: float
@param scaleMultiplier: Scale factor for surface heights.
"""
dataList = []
f = file(fileName, "r")
xrange=[1000000,-10000000]
yrange=[1000000,-10000000]
drange=[1000000,-10000000]
i = 0
for line in f.readlines():
if ((i % subsample) == 0):
elemList = string.split(string.strip(line), " ")
elemList = map(float, elemList)
if ((len(zField) > 6) and (zField[0]=="v")):
dataList.append(
Data(elemList[0:3], elemList[6:9])
)
else:
dataList.append(
Data(elemList[0:3], elemList[3:6])
)
i += 1
xList = [d.getPoint()[0] for d in dataList]
yList = [d.getPoint()[1] for d in dataList]
dList = \
[d.getDisplacementMagnitude() for d in dataList] \
+\
[d.getDisplacement()[0] for d in dataList] \
+\
[d.getDisplacement()[1] for d in dataList]
xrange = [min(xList), max(xList)]
yrange = [min(yList), max(yList)]
drange = [min(dList), max(dList)]
scaleFactor = 1.0
if (drange[1] > 0.0):
scaleFactor = \
scaleMultiplier \
* \
(max([xrange[1]-xrange[0], yrange[1]-yrange[0]])/2.0)/drange[1]
if (zField[1] == "x"):
extr = lambda x : [x.getPoint()[0], x.getPoint()[1], scaleFactor*x.getDisplacement()[0]]
elif (zField[1] == "y"):
extr = lambda x : [x.getPoint()[0], x.getPoint()[1], scaleFactor*x.getDisplacement()[1]]
else:
extr = lambda x : [x.getPoint()[0], x.getPoint()[1], scaleFactor*x.getDisplacementMagnitude()]
scene = Scene()
scene.setBackground(Colors.LightBlue)
scene.add(SurfaceData(dataList, PointExtractor(extr)))
scene.render(offScreen=False, size=imageSize)
def getOptionParser():
"""
Returns an object for parsing command line arguemnts.
@rtype: C{optparse.OptionParser}
@return: a parser initialised with some relevent command line options.
"""
usage = "usage: %prog [options] <dataFile>\n\n"
usage += "Displays a fitted surface of displacement/velocity data"
usage += " from the\nfile"
usage += " <dataFile>. This file is expected to contain lines\nof"
usage += " the form \"px py pz dx dy dz vx vy vz\"."
usage += " The pz and vz components\nare ignored."
parser = OptionParser(usage=usage)
parser.add_option(
"-z", "--z-component",
dest="zComponent",
metavar="Z",
default="dmag",
help=\
"Defines the component of the displacement or velocity which " +\
"is used as the surface height," +\
"Z={'dx', 'dy', 'dmagnitude', 'vx', 'vy', 'vmagnitude'}" +\
" (default Z=\"dmagnitude\")."
)
parser.add_option(
"-s", "--subsample",
dest="subsample",
metavar="S",
type = "int",
default=1,
help=\
"Only every S-th data point is read from file, rest are skipped " +\
" (default S=1)."
)
parser.add_option(
"-x", "--scale-multiplier",
dest="scaleMultiplier",
metavar="S",
type = "float",
default=1.0,
help=\
"Scale heights by this amount." +\
" (default S=1.0)."
)
parser.add_option(
"-i", "--image-size",
dest="imageSize",
metavar="P",
type = "int",
default=1024,
help=\
"Size of the image will be PxP pixels." +\
" (default P=1024)."
)
return parser
__doc__ = \
"""
Defines functions for rendering displacement data as a 3D surface.
This module can be as a C{__main__} and has the following usage::
%s
""" % (" " + string.replace(getOptionParser().format_help(), "\n", "\n "))
if (__name__ == "__main__"):
parser = getOptionParser()
(options, args) = parser.parse_args(sys.argv[1:])
fileName = args[0]
surfaceRenderDisplacements(
fileName,
options.zComponent,
options.subsample,
options.scaleMultiplier,
[options.imageSize, options.imageSize]
)
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