[Bprocessor-commit] model/src/net/sourceforge/bprocessor/model Surface.java, 1.98, 1.99

[Nikolaj B. <nbr...@us...>]

Update of /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv25705/src/net/sourceforge/bprocessor/model

Modified Files:
	Surface.java 
Log Message:
Area of a surface is now calculated and displayed in attribute view.

Index: Surface.java
===================================================================
RCS file: /cvsroot/bprocessor/model/src/net/sourceforge/bprocessor/model/Surface.java,v
retrieving revision 1.98
retrieving revision 1.99
diff -C2 -d -r1.98 -r1.99
*** Surface.java	7 Jun 2006 08:28:13 -0000	1.98
--- Surface.java	9 Jun 2006 09:49:56 -0000	1.99
***************
*** 1062,1065 ****
--- 1062,1119 ----
    }
    
+   
+   /**
+    * Get the area of the surface
+    * @return the area
+    */
+   public double getArea() {
+     double area = 0;
+     int norm = 1;
+     double highest = normal().getX();
+     if (Math.abs(highest) < Math.abs(normal().getY())) {
+       highest = normal().getY();
+       norm = 2;
+     }
+     if (Math.abs(highest) < Math.abs(normal().getZ())) {
+       highest = normal().getZ();
+       norm = 3;
+     }
+     Iterator it = getVertices().iterator();
+     double firstx, firsty, prevx, prevy, thisx, thisy;
+     firstx = 0;
+     firsty = 0;
+     prevx = 0;
+     prevy = 0;
+     thisx = 0;
+     thisy = 0;
+     boolean first = true;
+     while (it.hasNext()) {
+       Vertex v = (Vertex) it.next();
+       if (norm == 1) {
+         thisx = v.getY();
+         thisy = v.getZ();
+       } else if (norm == 2) {  
+         thisx = v.getX();
+         thisy = v.getZ();
+       } else {      
+         thisx = v.getX();
+         thisy = v.getY();
+       }
+       if (first) {
+         firstx = thisx;
+         firsty = thisy;
+         prevx = thisx;
+         prevy = thisy;
+         first = false;
+       } else {
+         area = area + (prevx * thisy - thisx * prevy);
+       }
+       prevx = thisx;
+       prevy = thisy;
+     }
+     area = Math.abs(0.5 * (area + thisx * firsty - firstx * thisy)) / Math.abs(highest);
+     return area;
+   }
+   
    /**
     * Returns the outward pointing normal to this Surface 
***************
*** 1342,1345 ****
--- 1396,1400 ----
        }
      }
+     res.add(new Attribute("Area", new Double(getArea()), false));
      if (isInner()) {
        res.add(new Attribute("Exterior", getExterior(), false));