tikz_polygons_example.cc

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#include <fstream>
#include <iostream>
#include <string>
 
#include <tikzgeom.H>
 
using namespace Aleph;
 
namespace
{
 
Polygon make_convex_polygon()
{
  Polygon poly;
  poly.add_vertex(Point(-40, -20));
  poly.add_vertex(Point(-12, -26));
  poly.add_vertex(Point(8, -6));
  poly.add_vertex(Point(-4, 20));
  poly.add_vertex(Point(-34, 16));
  poly.close();
  return poly;
}
 
Polygon make_concave_polygon()
{
  Polygon poly;
  poly.add_vertex(Point(18, -20));
  poly.add_vertex(Point(58, -20));
  poly.add_vertex(Point(62, 2));
  poly.add_vertex(Point(41, -4));
  poly.add_vertex(Point(30, 16));
  poly.add_vertex(Point(16, 6));
  poly.close();
  return poly;
}
 
void add_polygon_vertices(Tikz_Plane & plane, const Polygon & poly)
{
  for (Polygon::Vertex_Iterator it(poly); it.has_curr(); it.next_ne())
    put_in_plane(plane, it.get_current_vertex().to_point());
}
 
void add_regular_polygon_vertices(Tikz_Plane & plane, const Regular_Polygon & poly)
{
  for (size_t i = 0; i < poly.size(); ++i)
    put_in_plane(plane, poly.get_vertex(i));
}
 
} // namespace
 
int main(int argc, char * argv[])
{
  const std::string output_path =
      argc > 1 ? argv[1] : "tikz_polygons_example.tex";
 
  std::ofstream out(output_path);
  if (not out)
    {
      std::cerr << "Cannot open output file: " << output_path << '\n';
      return 1;
    }
 
  Tikz_Plane plane(190, 120, 5, 5);
  plane.put_cartesian_axis();
  plane.set_point_radius_mm(0.9);
 
  const Polygon convex = make_convex_polygon();
  const Polygon concave = make_concave_polygon();
  const Regular_Polygon regular(Point(96, 6), 17.0, 7, 0.2);
 
  put_in_plane(plane, convex);
  put_in_plane(plane, concave);
  put_in_plane(plane, regular);
 
  add_polygon_vertices(plane, convex);
  add_polygon_vertices(plane, concave);
  add_regular_polygon_vertices(plane, regular);
 
  put_in_plane(plane, Text(Point(-24, 27), "Convexo"));
  put_in_plane(plane, Text(Point(33, 24), "Concavo"));
  put_in_plane(plane, Text(Point(96, 30), "Regular (7 lados)"));
 
  out << "\\documentclass[tikz,border=8pt]{standalone}\n"
      << "\\usepackage{tikz}\n"
      << "\\begin{document}\n\n";
 
  plane.draw(out, true);
 
  out << "\n\\end{document}\n";
 
  std::cout << "Generated " << output_path << '\n'
            << "Compile with: pdflatex " << output_path << '\n';
 
  return 0;
}