import javax.media.opengl.*;
import java.util.*;
-/** tracks an equivalence class of geometric objects which are related to each other by transformation matrices */
-public class BindingGroup<T extends HasBindingGroup> implements Iterable<T> {
+/**
+ * An equivalence class of geometric objects whose positions are
+ * related by affine transformation matrices and are constrained by
+ * an affine constraint.
+ */
+class BindingGroup<T extends HasBindingGroup> implements Iterable<T> {
private T master = null;
private AffineConstraint constraint = new AffineConstraint.All();
matrices.put(master, Matrix.ONE);
}
- public int size() { return matrices.size(); }
+ int size() { return matrices.size(); }
- public void merge(BindingGroup<T> bg, Matrix m) {
+ /** merge another binding group into this one */
+ void merge(BindingGroup<T> bg, Matrix m, float epsilon) {
if (bg==this) {
- if (m.equalsModuloEpsilon(Matrix.ONE, 0.001f)) return;
- constraint = constraint.intersect(m.getAffineConstraint(0.001f), 0.001f);
+ if (m.equalsModuloEpsilon(Matrix.ONE, epsilon)) return;
+ // FIXME: what if points do not fall on the merged constraint-line?
+ constraint = constraint.intersect(m.getAffineConstraint(epsilon), epsilon);
return;
}
- for(HasBindingGroup hbg : bg.matrices.keySet()) {
- matrices.put((T)hbg, bg.matrices.get(hbg).times(m));
+ for(HasBindingGroup hbg : bg) {
+ matrices.put((T)hbg, bg.getMatrix((T)hbg).times(m));
hbg.bindingGroup = this;
}
// FIXME: what if points do not fall on the merged constraint-line?
AffineConstraint ac = bg.constraint.multiply(getMatrix(master, bg.master));
- constraint = constraint.intersect(ac, 0.001f);
+ constraint = constraint.intersect(ac, epsilon);
- HashSet<HasBindingGroup> stuff = new HashSet<HasBindingGroup>();
- for(HasBindingGroup hbg : bg.matrices.keySet())
- stuff.add(hbg);
- bg.matrices.clear();
bg.master = null;
- for(HasBindingGroup hbg : stuff)
- hbg.bindingGroupChanged(this);
+ for(HasBindingGroup hbg : bg) hbg.bindingGroupChanged();
+ bg.matrices.clear();
+ bg.matrices = null;
}
public Matrix getMatrix(T t) { return matrices.get(t); }
return getMatrix(t1).times(getMatrix(t2).inverse());
}
- public AffineConstraint getConstraint(T t) {
+ public AffineConstraint getAffineConstraint(T t) {
return constraint.multiply(matrices.get(t));
}
- public void unbind(T trem) {
+ void unbind(T trem) {
if (trem != master) {
matrices.remove(trem);
return;
Iterator<T> it = iterator();
T newmaster = it.next();
if (newmaster==trem) newmaster = it.next();
- if (newmaster==trem) throw new Error();
+ if (newmaster==trem) throw new Error("impossible");
+
+ // FIXME: is this correct?
+ constraint = constraint.multiply(getMatrix(newmaster, master));
+
HashMap<T,Matrix> newmatrices = new HashMap<T,Matrix>();
for(T t : matrices.keySet()) {
if (t==trem) continue;