write a 2d rod as an Amira lineset

[[Imported from SVN: r531]]

src/rodwriter.hh

+#ifndef ROD_WRITER_HH
+#define ROD_WRITER_HH
+
+
+void writeRod(const Dune::BlockVector<Dune::FieldVector<double,3> >& rod, 
+              const std::string& filename)
+{
+    int nLines = rod.size() + 1 + 3*rod.size();
+
+    // One point for each center line vertex and two for a little director at each vertex
+    int nPoints = 3*rod.size();
+
+    double directorLength = 1/((double)rod.size());
+
+    // /////////////////////
+    //   Write header
+    // /////////////////////
+
+    std::ofstream outfile(filename.c_str());
+
+    outfile << "# AmiraMesh 3D ASCII 2.0" << std::endl;
+    outfile << std::endl;
+    outfile << "# CreationDate: Mon Jul 18 17:14:27 2005" << std::endl;
+    outfile << std::endl;
+    outfile << std::endl;
+    outfile << "define Lines " << nLines << std::endl;
+    outfile << "nVertices " << nPoints << std::endl;
+    outfile << std::endl;
+    outfile << "Parameters {" << std::endl;
+    outfile << "    ContentType \"HxLineSet\"" << std::endl;
+    outfile << "}" << std::endl;
+    outfile << std::endl;
+    outfile << "Lines { int LineIdx } @1" << std::endl;
+    outfile << "Vertices { float[3] Coordinates } @2" << std::endl;
+    outfile << std::endl;
+    outfile << "# Data section follows" << std::endl;
+    outfile << "@1" << std::endl;
+
+    // ///////////////////////////////////////
+    //   write lines
+    // ///////////////////////////////////////
+
+    // The center axis
+    for (int i=0; i<rod.size(); i++)
+        outfile << i << std::endl;
+
+    outfile << "-1" << std::endl;
+
+    // The directors
+    for (int i=0; i<rod.size(); i++) {
+        outfile << rod.size()+2*i << std::endl;
+        outfile << rod.size()+2*i+1 << std::endl;
+        outfile << "-1" << std::endl;
+    }
+
+    // /////////////////////////////////////// 
+    //   Write the vertices
+    // ///////////////////////////////////////
+
+    outfile << std::endl << "@2" << std::endl;
+
+    // The center axis
+    for (int i=0; i<rod.size(); i++)
+        outfile << rod[i][0] << "  " << rod[i][1] << "  0" << std::endl;
+
+    // The directors
+    for (int i=0; i<rod.size(); i++) {
+
+        Dune::FieldVector<double, 2> director;
+        director[0] = -cos(rod[i][2]);
+        director[1] = sin(rod[i][2]);
+        director *= directorLength;
+
+        outfile << rod[i][0]+director[0] << "  " << rod[i][1]+director[1] << "  0 " << std::endl;
+        outfile << rod[i][0]-director[0] << "  " << rod[i][1]-director[1] << "  0 " << std::endl;
+
+    }
+
+    std::cout << "Result written successfully to: " << filename << std::endl;
+
+}
+
+#endif