public String toString() { return "<"+x+","+y+","+z+">"; }
}
+ public class BindingGroup {
+ public HashSet<E> es = new HashSet<E>();
+ public BindingGroup() { }
+ public merge(E e) {
+ if (e.bg != null) merge(e.bg);
+ else { es.add(e); e.bg = this; }
+ }
+ public merge(BindingGroup bg) {
+ for(E e : bg.es) {
+ e.bg = this;
+ this.bg.add(e);
+ }
+ }
+ }
+
/** [UNIQUE] an edge */
public final class E {
public final P p1, p2;
E pair; // partner half-edge
- public E bound_to = this;
+ public BindingGroup bg = null;
public void bind(E e) { bind(e, new M()); }
public void bind(E e, M m) {
- E old = this.bound_to;
- this.bound_to = e.bound_to;
- e.bound_to = old;
+ if (e.bg != null) e.bg.merge(this);
+ else if (bg != null) bg.merge(e);
+ else {
+ bg = new BindingGroup();
+ bg.merge(this);
+ bg.merge(e);
+ }
}
public void dobind() {
- for(E ex = bound_to; ex != this; ex = ex.bound_to) {
+ if (bg==null) return;
+ for(E ex : bg.es) {
+ if (ex==this) continue;
p1.bind(ex.p1);
p2.bind(ex.p2);
}