=.= Never mind, I've found the GEdge.h
On Thu, May 10, 2012 at 3:58 PM, Guowei He <[email protected]> wrote: > Dear gmsh users and , > > When the following C++ code is executed to generate a simple rectangle > with a circular hole in it, based on the sample given by > > Takuya OSHIMA, Ph.D. in http://www.geuz.org/pipermail/gmsh/2011/006803.html > > , warning message "Staring subloop x in Line Loop 1 (are you sure about > this?) is prompted during the command "gmsh test.geo", though the geo graph > looks fine, the test.geo generated contains some thing like Line Loop(1) = > {1, 2, 3, 4, -6, -5}; where 1 2 3 4 are external boundaries and 5 6 are > edges of the circle. However a nicer approach in gmsh scripting is do > something like > > // exterior boundary > ll1 = newll; Line Loop(ll1) = { l01, l02, l03, l04 }; > > // interstitial domain > s1 = news; Plane Surface(s1) = { ll1, beadSurfLoops[] }; > > Is there some corresponding "Loops" object in gmsh library or we only use > something like "typedef std::vector<GEdge *> Lineloop; > typedef std::vector<Lineloop> Loops;"? > > Many thanks! > > /////////////////////////////////////////////////////////////////// > test.geo > //////////////////////////////////////////////////////////////////////////////// > cl1 = 0.08; > Point(1) = {9.9, 8, 0, cl1}; > Point(2) = {-9.9, 8, 0, cl1}; > Point(3) = {-9.9, -8, 0, cl1}; > Point(4) = {9.9, -8, 0, cl1}; > Point(5) = {5, 5, 0, cl1}; > Point(6) = {5, 7.5, 0, cl1}; > Point(7) = {5, 2.5, 0, cl1}; > Line(1) = {1, 2}; > Line(2) = {2, 3}; > Line(3) = {3, 4}; > Line(4) = {4, 1}; > Circle(5) = {6, 5, 7}; > Circle(6) = {7, 5, 6}; > Line Loop(1) = {1, 2, 3, 4, -6, -5}; > Plane Surface(1) = {1}; > Line Loop(2) = {5, 6}; > Plane Surface(2) = {2}; > Physical Line("inlet") = {1}; > Physical Line("outlet") = {3}; > Physical Line("wall") = {2, 4}; > Physical Surface("interstitial") = {1}; > Physical Surface("beadface") = {2}; > > > > ////////////////////////////////////////////////////////// rec.cpp > ////////////////////////////////////////////////////////////////////////////////// > // A simple Gmsh API demonstration program. > #include "Gmsh.h" > #include "GModel.h" > #include "MElement.h" > #include "MVertex.h" > #include <iostream> > > typedef std::vector<GEdge *> Lineloop; > typedef std::vector<Lineloop> Loops; > > void *addBead(GModel *m, Loops &l, double const &cx, double const &cy, > double const &radius, double const &lc_bead) { > Lineloop b; > GVertex *gvc1c = m->addVertex(cx, cy, 0, lc_bead); > GVertex *gvc1s = m->addVertex(cx, cy - radius, 0, lc_bead); > GVertex *gvc1e = m->addVertex(cx, cy + radius, 0, lc_bead); > GEdge *gec11 = m->addCircleArcCenter(gvc1s, gvc1c, gvc1e); > GEdge *gec12 = m->addCircleArcCenter(gvc1e, gvc1c, gvc1s); > > b.push_back(gec11); > b.push_back(gec12); > l.push_back(b); > } > > int main(int argc, char **argv) > { > // Initialization. > GmshInitialize(argc, argv); > // Options may be set this way. > // Output information messages generated by the Gmsh library. > GmshSetOption("General", "Terminal", 1.); > // Be verbose (output debug messages). > GmshSetOption("General", "Verbosity", 99.); > // Create GModel (the Gmsh library core) instance. > GModel *m = new GModel; > // Choices are "Gmsh" and "OCC" if the Gmsh library is compiled with > // OpenCASCADE. Usually you want to use the "Gmsh" factory. > m->setFactory("Gmsh"); > > // Add vertices. Equivalent .geo directives are > // cl1 = 0.1; > // Point(1) = {-1, -1, 0, cl1}; > // Point(2) = {1, -1, 0, cl1}; > // Point(3) = {1, 1, 0, cl1}; > // Point(4) = {-1, 1, 0, cl1}; > // Point(5) = {0, 0, 0, cl1}; > const double lc_wall = 0.08, lc_bead = 0.08; > > // generating walls > const double xmin = 10, xmax = -10, ymin = 10, ymax = -10, dx = 0.1, dy > = 2; > > // corner points of rect domain > GVertex *gv1 = m->addVertex(xmin - dx, ymin - dy, 0, lc_wall); > GVertex *gv2 = m->addVertex(xmax + dx, ymin - dy, 0, lc_wall); > GVertex *gv3 = m->addVertex(xmax + dx, ymax + dy, 0, lc_wall); > GVertex *gv4 = m->addVertex(xmin - dx, ymax + dy, 0, lc_wall); > > // lines around the rect domain > GEdge *ge1 = m->addLine(gv1, gv2); > GEdge *ge2 = m->addLine(gv2, gv3); > GEdge *ge3 = m->addLine(gv3, gv4); > GEdge *ge4 = m->addLine(gv4, gv1); > > // // draw circle > > Loops ls; > > // exterior boundary > Lineloop tmp; > > tmp.push_back(ge1); > tmp.push_back(ge2); > tmp.push_back(ge3); > tmp.push_back(ge4); > ls.push_back(tmp); > > // call the bead func > int nBeads = 1; > double radius = ymax / nBeads / 4; > double cx = xmin / 2, cy = ymin / 2; > for (int i = 0; i < nBeads; i++) { > addBead(m, ls, cx, cy, radius, lc_bead); > cx += 3 * radius; > } > > > // interstitial domain > GFace *gf1 = m->addPlanarFace(ls); > > // create faces of beads > Loops::iterator it = ls.begin(); > it++; > std::vector<GRegion *> fbeads; > Loops lst; > int pn_beadface = m->setPhysicalName(nf_bead, dim_face); > for (;it != ls.end(); it++) { > lst.push_back(*it); > GFace *gft = m->addPlanarFace(lst); > gft->addPhysicalEntity(pn_beadface); > lst.pop_back(); > } > > // The geometry constructed by the operations above may be saved this > way. > m->writeGEO("test.geo"); > > // Create surface (2-D) mesh. Pass 3 to mesh() if creating a volume > // (3-D) mesh. > m->mesh(2); > > // // The created mesh may be saved this way. > m->writeMSH("test.msh"); > > > > // Finalization. > delete m; > GmshFinalize(); > } > > > -- > Kind regards, > Guowei He > > -- Kind regards, Guowei He
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