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 (bindingGroup.getMatrix(other).equals(Matrix.ONE)) return;
20 throw new Error("rebind attempt with " + bindingGroup.getMatrix(other));
26 .times(other.getBindingMatrix());
27 other.bindingGroup.merge(bindingGroup, bindingMatrix);
30 public Matrix getBindingMatrix() {
31 if (bindingGroup==null) return Matrix.ONE;
32 return bindingGroup.getMatrix(this);
35 public HasBindingGroup getMaster() {
36 if (bindingGroup==null) return this;
37 return bindingGroup.getMaster();
40 public void unbind() {
41 if (bindingGroup==null) return;
42 bindingGroup.unbind(this);
46 public boolean isBoundTo(HasBindingGroup t) {
47 return bindingGroup.contains(t);
50 public Iterable getBoundPeers() { return bindingGroup; }