使用 NetTopologySuite,这些表达式是错误的:
Point.Empty.Equals(Point.Empty); // false
Polygon.Empty.Equals(Polygon.Empty); // false
调试表明此行为是由
// Geometry
public IntersectionMatrix Relate(IGeometry g)
{
return RelateOp.Relate(this, g); // Point.Empty, Point.Empty
}
// IntersectionMatrix
public bool IsEquals(Dimension dimensionOfGeometryA, Dimension dimensionOfGeometryB)
{
if (dimensionOfGeometryA != dimensionOfGeometryB)
return false;
return IsTrue(_matrix[(int)Location.Interior, (int)Location.Interior]) &&
_matrix[(int)Location.Interior, (int)Location.Exterior] == Dimension.False &&
_matrix[(int)Location.Boundary, (int)Location.Exterior] == Dimension.False &&
_matrix[(int)Location.Exterior, (int)Location.Interior] == Dimension.False &&
_matrix[(int)Location.Exterior, (int)Location.Boundary] == Dimension.False;
}
我想知道这背后的原因是什么。据推测,这种行为也发生在相关库(jts、GEOS)中,我还假设地理代数内部人员知道这是有道理的。有人可以解释吗?