public void execute(PolyTree solution, double delta) {
solution.Clear();
fixOrientations();
doOffset(delta);
// now clean up 'corners' ...
final DefaultClipper clpr = new DefaultClipper(Clipper.REVERSE_SOLUTION);
clpr.addPaths(destPolys, PolyType.SUBJECT, true);
if (delta > 0) {
clpr.execute(ClipType.UNION, solution, PolyFillType.POSITIVE, PolyFillType.POSITIVE);
} else {
final LongRect r = destPolys.getBounds();
final Path outer = new Path(4);
outer.add(new LongPoint(r.left - 10, r.bottom + 10, 0));
outer.add(new LongPoint(r.right + 10, r.bottom + 10, 0));
outer.add(new LongPoint(r.right + 10, r.top - 10, 0));
outer.add(new LongPoint(r.left - 10, r.top - 10, 0));
clpr.addPath(outer, PolyType.SUBJECT, true);
clpr.execute(ClipType.UNION, solution, PolyFillType.NEGATIVE, PolyFillType.NEGATIVE);
// remove the outer PolyNode rectangle ...
if (solution.getChildCount() == 1 && solution.getChilds().get(0).getChildCount() > 0) {
final PolyNode outerNode = solution.getChilds().get(0);
solution.getChilds().set(0, outerNode.getChilds().get(0));
solution.getChilds().get(0).setParent(solution);
for (int i = 1; i < outerNode.getChildCount(); i++) {
solution.addChild(outerNode.getChilds().get(i));
}
} else {
solution.Clear();
}
}
}
