[Bprocessor-commit] model/src/net/sourceforge/bprocessor/model Surface.java,1.16,1.17

[Michael L. <he...@us...>]

Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv32143/src/net/sourceforge/bprocessor/model

Modified Files:
	Surface.java 
Log Message:
Implemented Surface.coordinateSystem()

Index: Surface.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Surface.java,v
retrieving revision 1.16
retrieving revision 1.17
diff -C2 -d -r1.16 -r1.17
*** Surface.java	31 Aug 2005 10:30:15 -0000	1.16
--- Surface.java	1 Sep 2005 12:44:01 -0000	1.17
***************
*** 279,282 ****
--- 279,307 ----
  
    /**
+    * Returns a CoordinateSystem where the xy-plane is
+    * co-planar to this Surface
+    * @return The local coordinate system for this Surface
+    */
+   public CoordinateSystem coordinateSystem() {
+     if (edges.size() > 1) {
+       Vertex i, j, n, origin;
+       Edge e0 = (Edge) edges.get(0);
+       Edge e1 = (Edge) edges.get(1);
+       origin = e0.getFrom();
+       Vertex p = e0.getTo();
+       Vertex q = e1.otherVertex(p);
+       i = p.minus(origin);
+       i.scale(1 / i.length());
+       Vertex v = q.minus(p);
+       n = i.cross(v);
+       n.scale(1 / n.length());
+       j = i.cross(n);
+       j.scale(1 / j.length());
+       return new CoordinateSystem(i, j, n, origin);
+     } else {
+       return null;
+     }
+   }
+   /**
     * Returns the projection on the surface normal
     * @param p The point to project on the normal