public JTSPointExpression<Point> centroid() {
        if (centroid == null) {
            centroid = JTSGeometryExpressions.pointOperation(SpatialOps.CENTROID, mixin);
        }
        return centroid;
    }
The mathematical centroid for this Surface as a Point. The result is not guaranteed to
be on this Surface.

@return centroid
querydsl-spatial/src/main/java/com/querydsl/spatial/locationtech/jts/JTSSurfaceExpression.java