1 package edu.berkeley.qfat.geom;
2 import javax.media.opengl.*;
4 import edu.berkeley.qfat.Mesh;
6 public abstract class HasBindingGroup {
8 public BindingGroup bindingGroup;
10 // know: self = bindingGroup[self] * master
11 // know: other = other.bindingGroup[other] * other.bindingGroup.master
12 // want: self = bindingMatrix * other
13 // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
14 // therefore: = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
15 public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
16 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
17 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
19 if (other.bindingGroup == this.bindingGroup) {
20 if (getBindingMatrix(other).equals(bindingMatrix))
23 if (this instanceof Mesh.E)
24 throw new Error("rebind attempt: "+this+" and "+other+" with "
27 + getBindingMatrix(other));
29 setConstraint(bindingMatrix);
31 System.err.println("WARNING: discarding rebind attempt: "+this+" and "+other+m);
36 //+ getBindingMatrix(other));
42 getBindingMatrix().inverse()
44 .times(other.getBindingMatrix());
45 other.bindingGroup.merge(bindingGroup, bindingMatrix);
48 public int bindingGroupSize() {
49 if (bindingGroup == null) return 1;
50 return bindingGroup.size();
54 public Matrix getBindingMatrix() {
55 if (bindingGroup==null) return Matrix.ONE;
56 return bindingGroup.getMatrix(this);
59 public Matrix getBindingMatrix(HasBindingGroup other) {
60 if (other==this) return Matrix.ONE;
61 return bindingGroup.getMatrix(this, other);
64 public HasBindingGroup getMaster() {
65 if (bindingGroup==null) return this;
66 return bindingGroup.getMaster();
69 public Matrix getConstraint() {
70 if (bindingGroup==null) return Matrix.ONE;
71 Matrix v = getBindingMatrix(getMaster());
72 return v.inverse().times(bindingGroup.krank).times(v);
74 public void setConstraint(Matrix m) {
75 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
76 Matrix v = getBindingMatrix(getMaster());
77 bindingGroup.krank = bindingGroup.krank.times(v.inverse().times(m).times(v));
80 public void unbind() {
81 if (bindingGroup==null) return;
82 bindingGroup.unbind(this);
84 bindingGroupChanged(bindingGroup);
87 public boolean isBoundTo(HasBindingGroup t) {
88 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
91 public Iterable getBoundPeers() {
92 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
95 public void bindingGroupChanged(BindingGroup newBindingGroup) { }