1 package edu.berkeley.qfat.geom;
2 import javax.media.opengl.*;
5 public abstract class HasBindingGroup {
7 public 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 Matrix vom = other.getBindingMatrix(bindingGroup.getMaster());
28 Matrix v2 = bindingMatrix;
29 Matrix v3 = getBindingMatrix(other);
30 Matrix m = vom.inverse().times(v2.inverse()).times(v3).times(vom);
31 bindingGroup.krank = bindingGroup.krank.times(m);
33 System.err.println("WARNING: discarding rebind attempt: "+this+" and "+other+m);
38 //+ getBindingMatrix(other));
44 getBindingMatrix().inverse()
46 .times(other.getBindingMatrix());
47 other.bindingGroup.merge(bindingGroup, bindingMatrix);
50 public int bindingGroupSize() {
51 if (bindingGroup == null) return 1;
52 return bindingGroup.size();
56 public Matrix getBindingMatrix() {
57 if (bindingGroup==null) return Matrix.ONE;
58 return bindingGroup.getMatrix(this);
61 public Matrix getBindingMatrix(HasBindingGroup other) {
62 if (other==this) return Matrix.ONE;
63 return bindingGroup.getMatrix(this, other);
66 public HasBindingGroup getMaster() {
67 if (bindingGroup==null) return this;
68 return bindingGroup.getMaster();
71 public void unbind() {
72 if (bindingGroup==null) return;
73 bindingGroup.unbind(this);
75 bindingGroupChanged(bindingGroup);
78 public boolean isBoundTo(HasBindingGroup t) {
79 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
82 public Iterable getBoundPeers() {
83 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
86 public void bindingGroupChanged(BindingGroup newBindingGroup) { }