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))
21 throw new Error("rebind attempt: "+this+" and "+other+" with "
24 + getBindingMatrix(other));
28 getBindingMatrix().inverse()
30 .times(other.getBindingMatrix());
31 other.bindingGroup.merge(bindingGroup, bindingMatrix);
34 public int bindingGroupSize() {
35 if (bindingGroup == null) return 1;
36 return bindingGroup.size();
40 public Matrix getBindingMatrix() {
41 if (bindingGroup==null) return Matrix.ONE;
42 return bindingGroup.getMatrix(this);
45 public Matrix getBindingMatrix(HasBindingGroup other) {
46 if (other==this) return Matrix.ONE;
47 return bindingGroup.getMatrix(this, other);
50 public HasBindingGroup getMaster() {
51 if (bindingGroup==null) return this;
52 return bindingGroup.getMaster();
55 public void unbind() {
56 if (bindingGroup==null) return;
57 bindingGroup.unbind(this);
59 bindingGroupChanged(bindingGroup);
62 public boolean isBoundTo(HasBindingGroup t) {
63 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
66 public Iterable getBoundPeers() {
67 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
70 public void bindingGroupChanged(BindingGroup newBindingGroup) { }