[Jts-topo-suite-user] SymDifference

[<su...@ti...>]

I have the following situation:

LinearRing linearRing1 = 
geometryFactory.createLinearRing(new Coordinate[]{
			new Coordinate(2, 
2),
			new Coordinate(2, 4),
			new Coordinate(1, 4),
			new Coordinate
(1, 2),
			new Coordinate(2, 2)
		});
Polygon polygon1 = 
geometryFactory.createPolygon(linearRing1, null);

LinearRing 
linearRing2 = geometryFactory.createLinearRing(new Coordinate[]{
				
new Coordinate(4, 1),
				new Coordinate(4, 3),
				new Coordinate(3, 
3),
				new Coordinate(3, 1),
				new Coordinate(4, 1)
		});
Polygon 
polygon2 = geometryFactory.createPolygon(linearRing2, null);

Why does 
polygon1.symDifference(polygon2) return MULTIPOLYGON (((2 2, 1 2, 1 4, 
2 4, 2 2)), ((4 1, 3 1, 3 3, 4 3, 4 1)))? I seem that the valid result 
should be POLYGON((3 2, 1 2, 1 4, 3 4, 3 3, 4 3, ...))! Can you help 
me???


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