// Last edited on 2000-03-16 17:26:40 by stolfi

class Map {
  // A simple map object

  public static class Node { 
    public double x, y; 
    public double r;       // dot radius (mm)
  }
  public static class Arc { 
    public Node org, dst;
    public double w;        // line width (mm)
  }

  public Node[] node;
  public Arc[] arc;

  public static Map Ring(int n) {
    int i;
    Map m = new Map();
    
    m.node = new Map.Node[n];
    m.arc = new Map.Arc[n];

    for (i = 0; i < n; i++) {
      m.node[i] = new Map.Node(); 
      m.node[i].x = Math.cos(2*Math.PI*i/n);
      m.node[i].y = Math.sin(2*Math.PI*i/n);
      m.node[i].r = 1;
    }

    for (i = 0; i < n; i++) {
      m.arc[i] = new Map.Arc();
      m.arc[i].org = m.node[i];
      m.arc[i].dst = m.node[(i+1)%n];
      m.arc[i].w = 0.5;
    }
    return (m);
  }
}