/[escript]/trunk/pycad/py_src/gmsh.py
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Contents of /trunk/pycad/py_src/gmsh.py

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Revision 2248 - (show annotations)
Thu Feb 5 23:24:04 2009 UTC (10 years, 7 months ago) by gross
File MIME type: text/x-python
File size: 8040 byte(s)
small fixes to gmsh command generation
1
2 ########################################################
3 #
4 # Copyright (c) 2003-2008 by University of Queensland
5 # Earth Systems Science Computational Center (ESSCC)
6 # http://www.uq.edu.au/esscc
7 #
8 # Primary Business: Queensland, Australia
9 # Licensed under the Open Software License version 3.0
10 # http://www.opensource.org/licenses/osl-3.0.php
11 #
12 ########################################################
13
14 __copyright__="""Copyright (c) 2003-2008 by University of Queensland
15 Earth Systems Science Computational Center (ESSCC)
16 http://www.uq.edu.au/esscc
17 Primary Business: Queensland, Australia"""
18 __license__="""Licensed under the Open Software License version 3.0
19 http://www.opensource.org/licenses/osl-3.0.php"""
20 __url__="http://www.uq.edu.au/esscc/escript-finley"
21
22 """
23 mesh generation using gmsh
24
25 @var __author__: name of author
26 @var __copyright__: copyrights
27 @var __license__: licence agreement
28 @var __url__: url entry point on documentation
29 @var __version__: version
30 @var __date__: date of the version
31 """
32
33 __author__="Lutz Gross, l.gross@uq.edu.au"
34
35 import design
36 import tempfile
37 import os
38 from primitives import Point, Spline, BezierCurve, BSpline, Line, Arc, CurveLoop, RuledSurface, PlaneSurface, SurfaceLoop, Volume, PropertySet, Ellipse
39
40 class Design(design.Design):
41 """
42 Design for gmsh.
43 """
44 DELAUNAY="iso"
45 NETGEN="netgen"
46 TETGEN="tetgen"
47
48 def __init__(self,dim=3,element_size=1.,order=1,keep_files=False):
49 """
50 Initializes the gmsh design.
51
52 @param dim: spatial dimension
53 @param element_size: global element size
54 @param order: element order
55 @param keep_files: flag to keep work files
56 """
57 design.Design.__init__(self,dim=dim,element_size=element_size,order=order,keep_files=keep_files)
58 self.setScriptFileName()
59 self.setMeshFileName()
60 self.setOptions()
61
62 def setScriptFileName(self,name=None):
63 """
64 Sets the filename for the gmsh input script. If no name is given a name
65 with extension I{geo} is generated.
66 """
67 if name == None:
68 tmp_f_id=tempfile.mkstemp(suffix=".geo")
69 self.__scriptname=tmp_f_id[1]
70 os.close(tmp_f_id[0])
71 else:
72 self.__scriptname=name
73 self.setKeepFilesOn()
74
75 def getScriptFileName(self):
76 """
77 Returns the name of the gmsh script file.
78 """
79 return self.__scriptname
80
81 def setMeshFileName(self, name=None):
82 """
83 Sets the name for the gmsh mesh file. If no name is given a name with
84 extension I{msh} is generated.
85 """
86 if name == None:
87 tmp_f_id=tempfile.mkstemp(suffix=".msh")
88 self.__mshname=tmp_f_id[1]
89 os.close(tmp_f_id[0])
90 else:
91 self.__mshname=name
92 self.setKeepFilesOn()
93
94 def getMeshFileName(self):
95 """
96 Returns the name of the gmsh mesh file.
97 """
98 return self.__mshname
99
100 def setOptions(self,algorithm=None,optimize_quality=True,smoothing=1, curvature_based_element_size=False):
101 """
102 Sets options for the mesh generator.
103 """
104 if curvature_based_element_size:
105 print "information: gmsh does not support curvature based element size anymore. Option ignored."
106 if algorithm==None: algorithm=self.DELAUNAY
107 self.__algo=algorithm
108 self.__optimize_quality=optimize_quality
109 self.__smoothing=smoothing
110
111 def __del__(self):
112 """
113 Cleans up.
114 """
115 if not self.keepFiles() :
116 os.unlink(self.getScriptFileName())
117 os.unlink(self.getMeshFileName())
118
119 def getCommandString(self):
120 """
121 Returns the gmsh command line.
122 """
123 if self.__optimize_quality:
124 opt="-optimize "
125 else:
126 opt=""
127
128 exe="gmsh -format msh -%s -algo %s -smooth %s %s-v 0 -order %s -o %s %s" % (
129 self.getDim(), self.__algo, self.__smoothing, opt,
130 self.getElementOrder(), self.getMeshFileName(),
131 self.getScriptFileName())
132 return exe
133
134 def getMeshHandler(self):
135 """
136 Returns a handle to a mesh meshing the design. In the current
137 implementation a mesh file name in gmsh format is returned.
138 """
139 f = open(self.getScriptFileName(),"w")
140 f.write(self.getScriptString())
141 f.close()
142 cmd = self.getCommandString()
143 ret = os.system(cmd) / 256
144 if ret > 0:
145 raise RuntimeError, "Could not build mesh: %s"%cmd
146 else:
147 return self.getMeshFileName()
148
149 def getScriptString(self):
150 """
151 Returns the gmsh script to generate the mesh.
152 """
153 h=self.getElementSize()
154 out="// generated by esys.pycad\n"
155 for prim in self.getAllPrimitives():
156 p=prim.getUnderlyingPrimitive()
157 if isinstance(p, Point):
158 c=p.getCoordinates()
159 out+="Point(%s) = {%s , %s, %s , %s };\n"%(p.getID(),c[0],c[1],c[2], p.getLocalScale()*h)
160
161 elif isinstance(p, Spline):
162 out+="Spline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))
163
164 elif isinstance(p, BezierCurve):
165 out+="Bezier(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))
166
167 elif isinstance(p, BSpline):
168 out+="BSpline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))
169
170 elif isinstance(p, Line):
171 out+="Line(%s) = {%s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getEndPoint().getDirectedID())
172
173 elif isinstance(p, Arc):
174 out+="Circle(%s) = {%s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getEndPoint().getDirectedID())
175
176 elif isinstance(p, Ellipse):
177 out+="Ellipse(%s) = {%s, %s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getPointOnMainAxis().getDirectedID(), p.getEndPoint().getDirectedID())
178
179 elif isinstance(p, CurveLoop):
180 out+="Line Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getCurves()))
181
182 elif isinstance(p, RuledSurface):
183 out+="Ruled Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID())
184
185 elif isinstance(p, PlaneSurface):
186 line=self.__mkArgs(p.getHoles())
187 if len(line)>0:
188 out+="Plane Surface(%s) = {%s, %s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID(), line)
189 else:
190 out+="Plane Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID())
191
192 elif isinstance(p, SurfaceLoop):
193 out+="Surface Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getSurfaces()))
194
195 elif isinstance(p, Volume):
196 line=self.__mkArgs(p.getHoles())
197 if len(line)>0:
198 out+="Volume(%s) = {%s, %s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID(), line)
199 else:
200 out+="Volume(%s) = {%s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID())
201
202 elif isinstance(p, PropertySet):
203 if p.getNumItems()>0:
204 dim=p.getDim()
205 line="Physical "
206 if dim==0:
207 line+="Point"
208 elif dim==1:
209 line+="Line"
210 elif dim==2:
211 line+="Surface"
212 else:
213 line+="Volume"
214 out+=line+"(" + str(p.getID()) + ") = {"+self.__mkArgs(p.getItems())+"};\n"
215
216 else:
217 raise TypeError("unable to pass %s object to gmsh."%str(type(p)))
218 return out
219
220
221 def __mkArgs(self,args):
222 line=""
223 for i in args:
224 if len(line)>0:
225 line+=", %s"%i.getDirectedID()
226 else:
227 line="%s"%i.getDirectedID()
228 return line
229

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