def load_mesh(file_name = ""):
"""read(file_name:string).
Function to load a mesh from the file file_name.
"""
raw_mesh = ocaml.mesh_readfile(file_name) # read mesh
mesh_info = ocaml.mesh_plotinfo(raw_mesh) # extract data from the mesh
print "read mesh: ok"
return mesh_info
def mesh_it(self, rod_length = 0.5 , driver = [],mesher = [], bbox = [], density = "", visual = False, angles = False, save = []):
"""mesh_it(rod_length:float, driver, mesher, \
bbox:[float list,float list]), density, visual:bool,
save:string list).
Function to mesh the present object(s). The rod_length
is the desired length of the connections between the mesh nodes,
a value which is weighted with the C function density. The bbox
defines the outer boundary box of the mesh. The flag visual
consents to visualise the mesh during its relaxation process,
and it can be saved specifying the file (with format) in the save
list.
Possible formats are postscript file(s) ("ps" extension) (2D only),
vtk file(s) ("vtk" extension) (included the ones created at every
visualization step) and "pyfem" format ("dat" extension).
The function returns the mesh data in a python list of lists
(the content is clear once they are inspected).
"""
self.rod = rod_length
self.density = density
if mesher == []:
self.mesher = ocaml.mesher_defaults
else:
self.mesher = mesher.my_mesher
self.__file_vtk = ""
self.__file_ps = ""
self.__file_dat = ""
self.__file_png = ""
globals()['fig_number']=0
globals()['angles_time']=[]
globals()['default_iterations'] = 200
def check_save():
"""Function to check if the mesh has to be saved
in any format.
"""
# print "check_save"
if len(save)>0:
for filename in save:
if filename[-3:]=="dat":
self.__file_dat = filename
elif filename[-3:]=="vtk":
self.__file_vtk = filename
elif filename[-3:]==".ps":
self.__file_ps = filename
elif filename[-3:]=="png":
self.__file_png = filename
else:
ValueError ("wrong extension in save file name")
# print self.__file_vtk, self.__file_ps, self.__file_dat, self.__file_png
if visual: # Initialisation of mayavi if argument visual = True
# print "load mayavi"
import mayavi, pylab # Tk error without pylab
self.myv = mayavi.mayavi()
def check_vtk(nr_piece,n,mesh):
# print "check_vtk -- 0"
if visual or self.__file_vtk!="":
# print "mesh_info"
mesh_info = ocaml.mesh_plotinfo(mesh)
# print "check_vtk -- 1"
v = self._mesh2vtk(mesh_info,self.__file_vtk,"-"+str(nr_piece),"-"+str(n))
# print "check_vtk -- 2"
if visual:
# print "visual"
# Function executed for argument visual = True
self.myv.close_all()
vd = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md = self.myv.load_module('SurfaceMap',0)
# reverse LUT
luthandler = mm.get_scalar_lut_handler()
luthandler.set_lut_red_blue()
# display legend, vertically with shadow effect
luthandler.sc_bar.SetVisibility(1)
luthandler.sc_bar.GetTitleTextProperty().SetShadow(1)
luthandler.sc_bar.GetLabelTextProperty().SetShadow(1)
luthandler.sc_bar.GetPositionCoordinate().SetValue(0.01,0.15)
luthandler.sc_bar.SetOrientationToVertical()
luthandler.sc_bar.SetWidth(0.14)
luthandler.sc_bar.SetHeight(0.85)
# luthandler.sc_bar.SetTitle('in2circ')
self.myv.renwin.z_plus_view()
vd2 = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md2 = self.myv.load_module('SurfaceMap',0)
md2.mapper.ScalarVisibilityOff()
md2.actor.GetProperty().SetRepresentationToWireframe()
self.myv.renwin.z_plus_view()
self.myv.Render()
# if angles analysis has been requested plot histogram in pylab now
if angles:
angles_data = self._findAngles(mesh_info)
n, bins, patches = pylab.hist(angles_data, range(0,180,5))
pylab.xlabel('Internal angle in degrees')
pylab.ylabel('Number of occurrences')
pylab.title('Histogram of internal angles of %d triangles' % (len(mesh_info[2][2])))
pylab.axvline(x=60, color='r')
pylab.savefig(self.__file_png[:-4]+str(globals()['fig_number'])+'.png')
globals()['fig_number'] = globals()['fig_number'] + 1
pylab.show() #(screws with Tk events)
pylab.clf()
# attempt to save time series of angles data for quality vs. time plot
# this temporary hack saves the median angle for the highest count bin
highest = 0
modal = 0
for i in range(len(n)):
if n[i] > highest:
highest = n[i]
modal = i
median = (bins[modal] + bins[modal-1])/2.
globals()['angles_time'].append(median)
raw_input('Hit Any Key to Continue')
def no_driver(nr_piece,n,mesh):
"""Function executed for argument visual = False
"""
# print "no_driver"
check_vtk(nr_piece,n,mesh)
pass
def fun_from_driver(nr_piece,n,mesh):
"""Function that glues together the user-defined
function and the (possible) visualisation of the
mesh during relaxation process.
"""
check_vtk(nr_piece,n,mesh)
# print "*********************fun_from_driver"
driver.driver_do(nr_piece,n,mesh) #user-defined function
check_save() # check if the mesh has to be saved
if driver == []: # no driver is given: use the default one
self.driver = ocaml.make_mg_gendriver(globals()['default_iterations'], no_driver)
else:
# print self.__file_vtk
self.driver = ocaml.make_mg_gendriver(driver.every_nr_steps,fun_from_driver)
if bbox != []: # overwrite bbox defined at object initialisation
self.bbox = bbox
# print self.bbox
# print self.obj
obj_length = len(self.obj) # number of objects to mesh
raw_mesh = ocaml.mesh_bodies_raw(self.driver,self.mesher,\
self.bbox[0],self.bbox[1],obj_length,\
self.obj,rod_length,self.density)
if self.__file_ps != "":
ocaml.mesh2d_ps(raw_mesh,self.__file_ps,[50.0,50.0,300.0,300.0])
if self.__file_dat != "":
ocaml.mesh_writefile(self.__file_dat,raw_mesh)
# to display final results in visual mode
if visual:
mesh_info = ocaml.mesh_plotinfo(raw_mesh)
v = self._mesh2vtk(mesh_info,self.__file_vtk)
self.myv.close_all()
vd = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md = self.myv.load_module('SurfaceMap',0)
# reverse LUT
luthandler = mm.get_scalar_lut_handler()
luthandler.set_lut_red_blue()
# display legend, vertically with shadow effect
luthandler.sc_bar.SetVisibility(1)
luthandler.sc_bar.GetTitleTextProperty().SetShadow(1)
luthandler.sc_bar.GetLabelTextProperty().SetShadow(1)
luthandler.sc_bar.GetPositionCoordinate().SetValue(0.01,0.15)
luthandler.sc_bar.SetOrientationToVertical()
luthandler.sc_bar.SetWidth(0.14)
luthandler.sc_bar.SetHeight(0.85)
# luthandler.sc_bar.SetTitle('in2circ')
self.myv.renwin.z_plus_view()
vd2 = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md2 = self.myv.load_module('SurfaceMap',0)
md2.mapper.ScalarVisibilityOff()
md2.actor.GetProperty().SetRepresentationToWireframe()
self.myv.renwin.z_plus_view()
self.myv.Render()
if self.__file_png:
# if angles analysis has been requested plot histogram in pylab now
if angles:
angles_data = self._findAngles(mesh_info)
n, bins, patches = pylab.hist(angles_data, range(0,180,5))
pylab.clf()
pylab.xlabel('Internal angle in degrees')
pylab.ylabel('Number of occurrences')
pylab.title('Histogram of internal angles of mesh triangles')
pylab.axvline(x=60, color='r')
pylab.savefig(self.__file_png[:-4]+str(globals()['fig_number'])+'.png')
globals()['fig_number'] = globals()['fig_number'] + 1
pylab.show() #(screws with Tk events)
# also save time plot of angles
pylab.clf()
total_iterations = globals()['default_iterations']*len(globals()['angles_time'])
xvalues = range(0,total_iterations,globals()['default_iterations'])
pylab.plot(xvalues,globals()['angles_time'],'k+')
pylab.hold(True)
pylab.plot(xvalues,globals()['angles_time'])
pylab.xlabel('Number of iterations')
pylab.ylabel('Modal internal angle (2D) in degrees')
pylab.title('Plot of mesh quality against time')
pylab.savefig(self.__file_png[:-4]+'_time.png')
raw_input('Hit Any Key to Exit.')
else:
mesh_info = ocaml.mesh_plotinfo(raw_mesh)
raw_input('Hit Any Key to Exit.')
def check_vtk(nr_piece,n,mesh):
# print "check_vtk -- 0"
if visual or self.__file_vtk!="":
# print "mesh_info"
mesh_info = ocaml.mesh_plotinfo(mesh)
# print "check_vtk -- 1"
v = self._mesh2vtk(mesh_info,self.__file_vtk,"-"+str(nr_piece),"-"+str(n))
# print "check_vtk -- 2"
if visual:
# print "visual"
# Function executed for argument visual = True
self.myv.close_all()
vd = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md = self.myv.load_module('SurfaceMap',0)
# reverse LUT
luthandler = mm.get_scalar_lut_handler()
luthandler.set_lut_red_blue()
# display legend, vertically with shadow effect
luthandler.sc_bar.SetVisibility(1)
luthandler.sc_bar.GetTitleTextProperty().SetShadow(1)
luthandler.sc_bar.GetLabelTextProperty().SetShadow(1)
luthandler.sc_bar.GetPositionCoordinate().SetValue(0.01,0.15)
luthandler.sc_bar.SetOrientationToVertical()
luthandler.sc_bar.SetWidth(0.14)
luthandler.sc_bar.SetHeight(0.85)
# luthandler.sc_bar.SetTitle('in2circ')
self.myv.renwin.z_plus_view()
vd2 = self.myv.open_vtk_data(v)
dvm = self.myv.get_current_dvm()
mm = dvm.get_current_module_mgr()
md2 = self.myv.load_module('SurfaceMap',0)
md2.mapper.ScalarVisibilityOff()
md2.actor.GetProperty().SetRepresentationToWireframe()
self.myv.renwin.z_plus_view()
self.myv.Render()
# if angles analysis has been requested plot histogram in pylab now
if angles:
angles_data = self._findAngles(mesh_info)
n, bins, patches = pylab.hist(angles_data, range(0,180,5))
pylab.xlabel('Internal angle in degrees')
pylab.ylabel('Number of occurrences')
pylab.title('Histogram of internal angles of %d triangles' % (len(mesh_info[2][2])))
pylab.axvline(x=60, color='r')
pylab.savefig(self.__file_png[:-4]+str(globals()['fig_number'])+'.png')
globals()['fig_number'] = globals()['fig_number'] + 1
pylab.show() #(screws with Tk events)
pylab.clf()
# attempt to save time series of angles data for quality vs. time plot
# this temporary hack saves the median angle for the highest count bin
highest = 0
modal = 0
for i in range(len(n)):
if n[i] > highest:
highest = n[i]
modal = i
median = (bins[modal] + bins[modal-1])/2.
globals()['angles_time'].append(median)
raw_input('Hit Any Key to Continue')
def inspect(self, mesh):
mesh_info = ocaml.mesh_plotinfo(mesh.raw_mesh) # extract data from the mesh
return mesh_info
