import javax.media.opengl.*;
import java.util.*;
-public class BindingGroup<T extends HasBindingGroup> {
+public class BindingGroup<T extends HasBindingGroup> implements Iterable<T> {
private T master = null;
private HashMap<T,Matrix> matrices = new HashMap<T,Matrix>();
}
public void merge(BindingGroup<T> bg, Matrix m) {
+ if (bg==this) throw new Error();
for(HasBindingGroup hbg : bg.matrices.keySet()) {
matrices.put((T)hbg, bg.matrices.get(hbg).times(m));
hbg.bindingGroup = this;
}
+ for(HasBindingGroup hbg : bg.matrices.keySet())
+ hbg.bindingGroupChanged(this);
bg.matrices.clear();
bg.master = null;
}
public T getMaster() { return master; }
public Matrix getMatrix(T t) { return matrices.get(t); }
- // t1 = getMatrix(t1) * master
- // getMatrix(t2)^-1 * t2 = master
- // t1 = getMatrix(t1) * getMatrix(t2)^-1 * t2
+ public Iterator<T> iterator() { return matrices.keySet().iterator(); }
+
/** t1 = getMatrix(t1, t2) * t2 */
public Matrix getMatrix(T t1, T t2) {
+ // t1 = getMatrix(t1) * master
+ // getMatrix(t2)^-1 * t2 = master
+ // t1 = getMatrix(t1) * getMatrix(t2)^-1 * t2
return getMatrix(t1).times(getMatrix(t2).inverse());
}
+ public void unbind(T trem) {
+ if (trem != master) {
+ matrices.remove(trem);
+ return;
+ }
+ if (matrices.size()==1) {
+ master = null;
+ matrices.remove(trem);
+ return;
+ }
+ Iterator<T> it = iterator();
+ T newmaster = it.next();
+ if (newmaster==trem) newmaster = it.next();
+ if (newmaster==trem) throw new Error();
+ HashMap<T,Matrix> newmatrices = new HashMap<T,Matrix>();
+ for(T t : matrices.keySet()) {
+ if (t==trem) continue;
+ newmatrices.put(t, getMatrix(t, newmaster));
+ }
+ master = newmaster;
+ matrices = newmatrices;
+ }
+
+ public boolean contains(HasBindingGroup t) {
+ return matrices.get((T)t) != null;
+ }
}