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# |
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# $Id$ |
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# |
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####################################################### |
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# |
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# Copyright 2003-2007 by ACceSS MNRF |
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# Copyright 2007 by University of Queensland |
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# |
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# http://esscc.uq.edu.au |
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# Primary Business: Queensland, Australia |
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# Licensed under the Open Software License version 3.0 |
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# http://www.opensource.org/licenses/osl-3.0.php |
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# |
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####################################################### |
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# |
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|
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""" |
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mesh generation using gmsh |
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|
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@var __author__: name of author |
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@var __copyright__: copyrights |
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@var __license__: licence agreement |
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@var __url__: url entry point on documentation |
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@var __version__: version |
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@var __date__: date of the version |
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""" |
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|
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|
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__author__="Lutz Gross, l.gross@uq.edu.au" |
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__copyright__=""" Copyright (c) 2007 by ACcESS MNRF |
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http://www.access.edu.au |
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Primary Business: Queensland, Australia""" |
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__license__="""Licensed under the Open Software License version 3.0 |
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http://www.opensource.org/licenses/osl-3.0.php""" |
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__url__="http://www.iservo.edu.au/esys/escript" |
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__version__="$Revision:$" |
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__date__="$Date:$" |
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|
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import design |
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import tempfile |
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import os |
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from primitives import Point, Spline, BezierCurve, BSpline, Line, Arc, CurveLoop, RuledSurface, PlaneSurface, SurfaceLoop, Volume, PropertySet, Ellipse |
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|
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class Design(design.Design): |
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""" |
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design fo gmsh |
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""" |
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DELAUNAY="iso" |
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NETGEN="netgen" |
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TETGEN="tetgen" |
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def __init__(self,dim=3,element_size=1.,order=1,keep_files=False): |
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""" |
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initializes the gmsh design |
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|
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@param dim: patial dimension |
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@param element_size: global element size |
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@param order: element order |
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@param keep_files: flag to keep work files. |
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""" |
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design.Design.__init__(self,dim=dim,element_size=element_size,order=order,keep_files=keep_files) |
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self.setScriptFileName() |
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self.setMeshFileName() |
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self.setOptions() |
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def setScriptFileName(self,name=None): |
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""" |
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set the filename for the gmsh input script. if no name is given a name with extension geo is generated. |
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""" |
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if name == None: |
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self.__scriptname=tempfile.mkstemp(suffix=".geo")[1] |
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else: |
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self.__scriptname=name |
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self.setKeepFilesOn() |
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def getScriptFileName(self): |
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""" |
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returns the name of the file for the gmsh script |
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""" |
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return self.__scriptname |
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def setMeshFileName(self, name=None): |
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""" |
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sets the name for the gmsh mesh file. if no name is given a name with extension msh is generated. |
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""" |
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if name == None: |
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self.__mshname=tempfile.mkstemp(suffix=".msh")[1] |
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else: |
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self.__mshname=name |
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self.setKeepFilesOn() |
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def getMeshFileName(self): |
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""" |
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returns the name of the file for the gmsh msh |
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""" |
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return self.__mshname |
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def setOptions(self,algorithm=None,optimize_quality=True,smoothing=1, curvature_based_element_size=False): |
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""" |
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sets options for the mesh generator |
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""" |
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if algorithm==None: algorithm=self.DELAUNAY |
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self.__curvature_based_element_size=curvature_based_element_size |
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self.__algo=algorithm |
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self.__optimize_quality=optimize_quality |
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self.__smoothing=smoothing |
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def __del__(self): |
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""" |
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clean up |
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""" |
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if not self.keepFiles(): |
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os.unlink(self.getScriptFileName()) |
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os.unlink(self.getMeshFileName()) |
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def getCommandString(self): |
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""" |
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returns the gmsh comand |
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""" |
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if self.__optimize_quality: |
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opt="-optimize " |
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else: |
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opt="" |
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if self.__curvature_based_element_size: |
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clcurv="-clcurv " |
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else: |
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clcurv="" |
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|
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exe="gmsh -%s -algo %s %s-smooth %s %s-v 0 -order %s -o %s %s"%(self.getDim(), |
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self.__algo, |
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clcurv, |
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self.__smoothing, |
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opt, |
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self.getElementOrder(), |
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self.getMeshFileName(), |
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self.getScriptFileName()) |
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return exe |
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def getMeshHandler(self): |
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""" |
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returns a handle to a mesh meshing the design. In the current implementation |
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a mesh file name in gmsh format is returned. |
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""" |
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open(self.getScriptFileName(),"w").write(self.getScriptString()) |
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cmd = self.getCommandString() |
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ret = os.system(cmd) / 256 |
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if ret > 0: |
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raise RuntimeError, "Could not build mesh: %s"%cmd |
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else: |
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return self.getMeshFileName() |
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|
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def getScriptString(self): |
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""" |
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returns the gmsh script to generate the mesh |
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""" |
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h=self.getElementSize() |
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out="// generated by esys.pycad\n" |
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for prim in self.getAllPrimitives(): |
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p=prim.getUnderlyingPrimitive() |
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if isinstance(p, Point): |
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c=p.getCoordinates() |
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out+="Point(%s) = {%s , %s, %s , %s };\n"%(p.getID(),c[0],c[1],c[2], p.getLocalScale()*h) |
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|
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elif isinstance(p, Spline): |
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out+="Spline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
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|
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elif isinstance(p, BezierCurve): |
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out+="Bezier(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
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|
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elif isinstance(p, BSpline): |
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out+="BSpline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
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|
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elif isinstance(p, Line): |
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out+="Line(%s) = {%s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getEndPoint().getDirectedID()) |
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|
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elif isinstance(p, Arc): |
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out+="Circle(%s) = {%s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getEndPoint().getDirectedID()) |
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|
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elif isinstance(p, Ellipse): |
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out+="Ellipse(%s) = {%s, %s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getPointOnMainAxis().getDirectedID(), p.getEndPoint().getDirectedID()) |
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|
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elif isinstance(p, CurveLoop): |
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out+="Line Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getCurves())) |
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|
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elif isinstance(p, RuledSurface): |
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out+="Ruled Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID()) |
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|
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elif isinstance(p, PlaneSurface): |
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line=self.__mkArgs(p.getHoles()) |
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if len(line)>0: |
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out+="Plane Surface(%s) = {%s, %s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID(), line) |
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else: |
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out+="Plane Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID()) |
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|
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elif isinstance(p, SurfaceLoop): |
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out+="Surface Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getSurfaces())) |
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|
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elif isinstance(p, Volume): |
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line=self.__mkArgs(p.getHoles()) |
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if len(line)>0: |
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out+="Volume(%s) = {%s, %s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID(), line) |
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else: |
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out+="Volume(%s) = {%s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID()) |
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|
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elif isinstance(p, PropertySet): |
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if p.getNumItems()>0: |
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dim=p.getDim() |
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line="Physical " |
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if dim==0: |
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line+="Point" |
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elif dim==1: |
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line+="Line" |
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elif dim==2: |
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line+="Surface" |
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else: |
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line+="Volume" |
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out+=line+"(" + str(p.getID()) + ") = {"+self.__mkArgs(p.getItems())+"};\n" |
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|
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else: |
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raise TypeError("unable to pass %s object to gmsh."%str(type(p))) |
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return out |
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|
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|
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def __mkArgs(self,args): |
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line="" |
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for i in args: |
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if len(line)>0: |
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line+=", %s"%i.getDirectedID() |
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else: |
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line="%s"%i.getDirectedID() |
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return line |
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