src/edu/berkeley/qfat/geom/HasBindingGroup.java

   1 package edu.berkeley.qfat.geom;
   2 import javax.media.opengl.*;
   3 import java.util.*;
   4 import edu.berkeley.qfat.Mesh;
   5
   6 public abstract class HasBindingGroup {
   7
   8     public BindingGroup bindingGroup;
   9
  10     // know:      self   = bindingGroup[self] * master
  11     // know:      other  = other.bindingGroup[other] * other.bindingGroup.master
  12     // want:      self   = bindingMatrix * other
  13     // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
  14     // therefore:        = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
  15     public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
  16         if (bindingGroup == null) bindingGroup = new BindingGroup(this);
  17         if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
  18
  19         if (other.bindingGroup == this.bindingGroup) {
  20             if (getBindingMatrix(other).equals(bindingMatrix))
  21                 return;
  22             /*
  23             if (this instanceof Mesh.E)
  24                 throw new Error("rebind attempt: "+this+" and "+other+" with "
  25                                 + bindingMatrix
  26                                 + "; expected "
  27                                 + getBindingMatrix(other));
  28             */
  29             Matrix vom = other.getBindingMatrix(bindingGroup.getMaster());
  30             Matrix v2 = bindingMatrix;
  31             Matrix v3 = getBindingMatrix(other);
  32             Matrix m = vom.inverse().times(v2.inverse()).times(v3).times(vom);
  33             bindingGroup.krank = bindingGroup.krank.times(m);
  34             /*
  35               System.err.println("WARNING: discarding rebind attempt: "+this+" and "+other+m);
  36             */
  37             //" with "
  38             //+ bindingMatrix
  39             //+ "; expected "
  40             //+ getBindingMatrix(other));
  41             return;
  42         }
  43
  44
  45         bindingMatrix =
  46             getBindingMatrix().inverse()
  47             .times(bindingMatrix)
  48             .times(other.getBindingMatrix());
  49         other.bindingGroup.merge(bindingGroup, bindingMatrix);
  50     }
  51
  52     public int bindingGroupSize() {
  53         if (bindingGroup == null) return 1;
  54         return bindingGroup.size();
  55     }
  56
  57
  58     public Matrix getBindingMatrix() {
  59         if (bindingGroup==null) return Matrix.ONE;
  60         return bindingGroup.getMatrix(this);
  61     }
  62
  63     public Matrix getBindingMatrix(HasBindingGroup other) {
  64         if (other==this) return Matrix.ONE;
  65         return bindingGroup.getMatrix(this, other);
  66     }
  67
  68     public HasBindingGroup getMaster() {
  69         if (bindingGroup==null) return this;
  70         return bindingGroup.getMaster();
  71     }
  72
  73     public Matrix getConstraint() {
  74         if (bindingGroup==null) return Matrix.ONE;
  75         Matrix v = getBindingMatrix(getMaster());
  76         return v.inverse().times(bindingGroup.krank).times(v);
  77     }
  78     public void setConstraint(Matrix m) {
  79         /*
  80         if (bindingGroup==null) bindingGroup = new BindingGroup(this);
  81         Matrix v = getBindingMatrix(getMaster());
  82         bindingGroup.krank = bindingGroup.krank.times(v.inverse().times(m).times(v));
  83         */
  84     }
  85
  86     public void unbind() {
  87         if (bindingGroup==null) return;
  88         bindingGroup.unbind(this);
  89         bindingGroup = null;
  90         bindingGroupChanged(bindingGroup);
  91     }
  92
  93     public boolean isBoundTo(HasBindingGroup t) {
  94         return t==this || (bindingGroup!=null && bindingGroup.contains(t));
  95     }
  96
  97     public Iterable getBoundPeers() {
  98         if (bindingGroup==null) bindingGroup = new BindingGroup(this);
  99         return bindingGroup;
 100     }
 101     public void bindingGroupChanged(BindingGroup newBindingGroup) { }
 102 }