[Bprocessor-commit] model/src/net/sourceforge/bprocessor/model Vertex.java,1.5,1.6

[Nordholt <nor...@us...>]

Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv7616

Modified Files:
	Vertex.java 
Log Message:
method for calculating derterminants

Index: Vertex.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Vertex.java,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** Vertex.java	16 Aug 2005 11:45:03 -0000	1.5
--- Vertex.java	30 Aug 2005 13:14:55 -0000	1.6
***************
*** 225,228 ****
--- 225,254 ----
      return Math.sqrt(Math.abs(getX() * getX() + getY() * getY() + getZ() * getZ()));
    }
+   
+   /**
+    * Computes the the determinant of this and to other vertecies.
+    * The form is: determinant{this, v, u}.
+    * @param v the second vertex
+    * @param u the third vertex
+    * @return the determinant.
+    */
+   public double determinant(Vertex v, Vertex u) {
+     double tx = this.getX();
+     double ty = this.getY();
+     double tz = this.getZ();
+     
+     double vx = v.getX();
+     double vy = v.getY();
+     double vz = v.getZ();
+     
+     double ux = u.getX();
+     double uy = u.getY();
+     double uz = u.getZ();
+     
+     double result = tx * ((vy * uz) - (vz * uy));
+     result -= vx * ((ty * uz) - (tz * uy));
+     result += ux * ((ty * vz) - (tz * vy));
+     return result;
+   }
  
    /**