Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv27439
Modified Files:
Surface.java
Log Message:
Added methods for calculating normals
Index: Surface.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Surface.java,v
retrieving revision 1.7
retrieving revision 1.8
diff -C2 -d -r1.7 -r1.8
*** Surface.java 4 Aug 2005 11:11:49 -0000 1.7
--- Surface.java 5 Aug 2005 10:42:09 -0000 1.8
***************
*** 8,11 ****
--- 8,12 ----
import java.io.Serializable;
+ import java.util.Iterator;
import java.util.List;
***************
*** 130,133 ****
--- 131,190 ----
/**
+ * returns the normal to this
+ * @return A vector normal for this surface, null if the surface consists of only one edge
+ */
+ public Vertex normal() {
+ if (edges.size() > 1) {
+ Iterator it = edges.iterator();
+ EdgeFacade ef = EdgeFacade.getInstance();
+ Edge e1 = ef.findById(((Edge)it.next()).getId());
+ Edge e2 = ef.findById(((Edge)it.next()).getId());
+ Vertex v1 = e1.getFrom();
+ Vertex v2 = e1.getTo();
+ Vertex v3 = e2.getTo();
+
+ if (v3.equals(v2) || v3.equals(v1)) {
+ v3 = e2.getFrom();
+ }
+ Vertex v2v1 = v1.minus(v2);
+ Vertex v2v3 = v3.minus(v2);
+ return v2v1.cross(v2v3);
+ }
+ return null;
+ }
+
+ /**
+ * Retruns the projection on the surface normal
+ * @param p The point to project on the normal
+ * @return the projection
+ */
+ public Vertex projection(double[] p) {
+ if (edges.size() > 0) {
+ Iterator it = edges.iterator();
+ Vertex from = ((Edge)it.next()).getTo();
+ Vertex point = new Vertex();
+ point.setX(p[0] - from.getX());
+ point.setY(p[1] - from.getY());
+ point.setZ(p[2] - from.getZ());
+ Vertex normal = normal();
+ double dot = normal.dot(point);
+ double length = normal.length();
+ double scale = dot / (length * length);
+ normal.scale(scale);
+ return normal;
+ }
+ return null;
+ }
+
+ /**
+ * Checks if e is in the surface
+ * @param e The edge
+ * @return True if e is in this otherwise false
+ */
+ public boolean contains(Edge e) {
+ return edges.contains(e);
+ }
+
+ /**
* Return the hash code of the object
* @return The hash
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