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) {
18 bindTo(bindingMatrix, other, 0.001f);
20 public void bindTo(Matrix bindingMatrix, HasBindingGroup other, float epsilon) {
21 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
22 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
25 getBindingMatrix().inverse()
27 .times(other.getBindingMatrix());
28 other.bindingGroup.merge(bindingGroup, bindingMatrix, epsilon);
31 public int bindingGroupSize() {
32 if (bindingGroup == null) return 1;
33 return bindingGroup.size();
36 public AffineConstraint getBindingConstraint() {
37 if (bindingGroup==null) return new AffineConstraint.All();
38 return bindingGroup.getAffineConstraint(this);
41 public Matrix getBindingMatrix() {
42 if (bindingGroup==null) return Matrix.ONE;
43 return bindingGroup.getMatrix(this);
46 public Matrix getBindingMatrix(HasBindingGroup other) {
47 if (other==this) return Matrix.ONE;
48 return bindingGroup.getMatrix(this, other);
51 public void unbind() {
52 if (bindingGroup==null) return;
53 bindingGroup.unbind(this);
55 bindingGroupChanged();
58 public boolean isBoundTo(HasBindingGroup t) {
59 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
62 public Iterable getBoundPeers() {
63 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
66 public void bindingGroupChanged() { }