1 package edu.berkeley.qfat.bind;
2 import edu.berkeley.qfat.geom.*;
3 import javax.media.opengl.*;
5 import edu.berkeley.qfat.Mesh;
7 public abstract class HasBindingGroup {
9 public BindingGroup bindingGroup;
11 // know: self = bindingGroup[self] * master
12 // know: other = other.bindingGroup[other] * other.bindingGroup.master
13 // want: self = bindingMatrix * other
14 // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
15 // therefore: = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
16 public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
17 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
18 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
21 getBindingMatrix().inverse()
23 .times(other.getBindingMatrix());
24 other.bindingGroup.merge(bindingGroup, bindingMatrix);
27 public int bindingGroupSize() {
28 if (bindingGroup == null) return 1;
29 return bindingGroup.size();
32 public AffineConstraint getBindingConstraint() {
33 if (bindingGroup==null) return new AffineConstraint.All();
34 return bindingGroup.getConstraint(this);
37 public Matrix getBindingMatrix() {
38 if (bindingGroup==null) return Matrix.ONE;
39 return bindingGroup.getMatrix(this);
42 public Matrix getBindingMatrix(HasBindingGroup other) {
43 if (other==this) return Matrix.ONE;
44 return bindingGroup.getMatrix(this, other);
47 public void unbind() {
48 if (bindingGroup==null) return;
49 bindingGroup.unbind(this);
51 bindingGroupChanged(bindingGroup);
54 public boolean isBoundTo(HasBindingGroup t) {
55 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
58 public Iterable getBoundPeers() {
59 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
62 public void bindingGroupChanged(BindingGroup newBindingGroup) { }