1 package edu.berkeley.qfat.bind;
2 import edu.berkeley.qfat.geom.*;
3 import javax.media.opengl.*;
5 import edu.berkeley.qfat.Mesh;
8 * A member of an equivalence class of geometric objects whose
9 * positions are related by affine transformation matrices and are
10 * constrained by an affine constraint.
12 public abstract class HasBindingGroup {
14 private BindingGroup bindingGroup;
16 // know: self = bindingGroup[self] * master
17 // know: other = other.bindingGroup[other] * other.bindingGroup.master
18 // want: self = bindingMatrix * other
19 // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
20 // therefore: = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
21 public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
23 bindTo(bindingMatrix, other, 0.001f);
25 public void bindTo(Matrix bindingMatrix, HasBindingGroup other, float epsilon) {
26 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
27 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
30 getBindingMatrix().inverse()
32 .times(other.getBindingMatrix());
33 other.bindingGroup.merge(bindingGroup, bindingMatrix, epsilon);
36 public int bindingGroupSize() {
37 if (bindingGroup == null) return 1;
38 return bindingGroup.size();
41 public AffineConstraint getBindingConstraint() {
42 if (bindingGroup==null) return new AffineConstraint.All();
43 return bindingGroup.getAffineConstraint(this);
46 public Matrix getBindingMatrix() {
47 if (bindingGroup==null) return Matrix.ONE;
48 return bindingGroup.getMatrix(this);
51 public Matrix getBindingMatrix(HasBindingGroup other) {
52 if (other==this) return Matrix.ONE;
53 return bindingGroup.getMatrix(this, other);
56 public void unbind() {
57 if (bindingGroup==null) return;
58 bindingGroup.unbind(this);
60 bindingGroupChanged();
63 public boolean isBoundTo(HasBindingGroup t) {
64 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
67 public Iterable getBoundPeers() {
68 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
71 public void bindingGroupChanged() { }