1 package edu.berkeley.qfat.geom;
2 import javax.media.opengl.*;
5 public abstract class HasBindingGroup {
7 BindingGroup bindingGroup;
9 // know: self = bindingGroup[self] * master
10 // know: other = other.bindingGroup[other] * other.bindingGroup.master
11 // want: self = bindingMatrix * other
12 // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
13 // therefore: = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
14 public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
15 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
16 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
18 if (other.bindingGroup == this.bindingGroup) {
19 if (getBindingMatrix(other).equals(bindingMatrix))
22 throw new Error("rebind attempt: "+this+" and "+other+" with "
25 + getBindingMatrix(other));
27 System.err.println("WARNING: discarding rebind attempt: "+this+" and "+other+" with "
30 + getBindingMatrix(other));
35 getBindingMatrix().inverse()
37 .times(other.getBindingMatrix());
38 other.bindingGroup.merge(bindingGroup, bindingMatrix);
41 public int bindingGroupSize() {
42 if (bindingGroup == null) return 1;
43 return bindingGroup.size();
47 public Matrix getBindingMatrix() {
48 if (bindingGroup==null) return Matrix.ONE;
49 return bindingGroup.getMatrix(this);
52 public Matrix getBindingMatrix(HasBindingGroup other) {
53 if (other==this) return Matrix.ONE;
54 return bindingGroup.getMatrix(this, other);
57 public HasBindingGroup getMaster() {
58 if (bindingGroup==null) return this;
59 return bindingGroup.getMaster();
62 public void unbind() {
63 if (bindingGroup==null) return;
64 bindingGroup.unbind(this);
66 bindingGroupChanged(bindingGroup);
69 public boolean isBoundTo(HasBindingGroup t) {
70 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
73 public Iterable getBoundPeers() {
74 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
77 public void bindingGroupChanged(BindingGroup newBindingGroup) { }