Union of forms that share an edge

[JoseNavio]

Hi, I was doing some tests with the clipper2 Java port and I have the following doubt, what is the best approach to join polygons that share the same edge?, I mean adjacent forms.

I get some different behaviours:

• Using Long(64)

  
      Paths64 one = new Paths64();
      Paths64 two = new Paths64();
      one.add(Clipper.MakePath(new int[]{
              0, 0, 0, 1, 1, 1, 1, 0}));
      two.add(Clipper.MakePath(new int[]{
              1, 0, 2, 0, 2, 1, 1, 1}));
      Paths64 union = Clipper.Union(one, two, FillRule.NonZero);
      System.out.println("Union: " + union);
  
      //Result: 
      A = (1,0)  (1,1)  (0,1)  (0,0)  
      B = (2,1)  (1,1)  (1,0)  (2,0)  
  
      //It consider they do not intersect, so they cannot be joined as one?

- Using Doubles

    PathsD oneDouble = new PathsD();
    PathsD twoDouble = new PathsD();
    oneDouble.add(Clipper.MakePath(new double[]{
            0d, 1d, 1d, 1d, 1d, 0d, 0d, 0d}));
    twoDouble.add(Clipper.MakePath(new double[]{
            1d, 0d, 2d, 0d, 2d, 1d, 1d, 1d}));
    PathsD unionDouble = Clipper.Union(oneDouble, twoDouble, FillRule.NonZero, 3);
    System.out.println("Union with doubles: " + unionDouble);

    //Result:
    A = 1,000000,0,000000)  (2,000000,0,000000)  (2,000000,1,000000) (1,000000,1,000000)  (0,000000,1,000000)  (0,000000,0,000000)  

    //That would do, but my values are long too...

Thanks.