quick implementation of polygon splitting process

split.js

    // Execute method for js:split process expects polygon and line geometries as input
    run: function(inputs) {
        var merger = new LineMerger();
        merger.add(inputs.poly._geometry);
        merger.add(inputs.line._geometry);
        var collection = merger.getMergedLineStrings();
        var union = new UnaryUnionOp(collection).union();

        var polygonizer = new Polygonizer();
        polygonizer.add(union);
        var parts = polygonizer.getPolygons();

        var candidate, intersection, polys = [];
        for (var i=0, ii=parts.size(); i<ii; ++i) {
            candidate = geom.Geometry.from_(parts.get(i));
            // TODO: ask MD if inputs.poly.overlaps(candidate) is expected to work here
            try {
                intersection = candidate.intersection(inputs.poly);
                // TODO: unhack this
                if (intersection.area / candidate.area > 0.01) {
                    polys.push(candidate);
                }
            } catch (err) {
                // pass
            }
        }
        
        return {result: new geom.MultiPolygon(polys)};
    }