Union of forms that touch but don't intersect

[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 can't 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.