[OpenMap Users] polygon with holes

From: Tore Halset <halset_at_pvv.ntnu.no>
Date: Thu, 15 Jun 2006 15:16:14 +0200

Hello.

I have had some problems with polygons with holes resulting in
horizontal lines.

http://openmap.bbn.com/mailArchives/openmap-users/2006-03/4724.html

I created a simple OMGraphic that *seem to fix* the problem in my
application. It probably does not work for selection, labeling and
the other stuff that I am not using in my application.

Regards,
  - Tore.

public class OMPolyWithHoles extends OMGraphic {

     private OMPoly exteriour = null;

     private List<OMPoly> holes = null;

     public OMPolyWithHoles() {
     }

     public OMPolyWithHoles(int numberOfHoles) {
         this();
         holes = new ArrayList<OMPoly>(numberOfHoles);
     }

     public void setExteriour(OMPoly exteriour) {
         this.exteriour = exteriour;
     }

     public void addHole(OMPoly hole) {
         if (holes == null) {
             holes = new ArrayList<OMPoly>(2);
         }
         holes.add(hole);
     }

     /**
      * Prepare the poly for rendering.
      *
      * _at_param proj
      * Projection
      * _at_return true if generate was successful
      */
     public boolean generate(Projection proj) {
         boolean r = exteriour.generate(proj);
         if (!r) {
             return false;
         }
         for (OMPoly hole : getHoles()) {
             r = hole.generate(proj);
             if (!r) {
                 return false;
             }
         }
         createShape();
         return r;
     }

     protected List<OMPoly> getHoles() {
         if (holes == null) {
             return Collections.emptyList();
         }
         return holes;
     }

     /**
      * Since OMPoly has the option to not create a Shape, this
method is here to
      * create it if it is asked for. The OMPoly needs to be generated.
      */
     protected void createShape() {

         GeneralPath path = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
         path.append(exteriour.getShape(), false);

         for (OMPoly hole : getHoles()) {
             path.append(hole.getShape(), false);
         }

         setShape(path);
     }

     public void render(Graphics gr) {
         Shape shp = getShape();
         Graphics2D g2 = (Graphics2D) gr;
         setGraphicsForFill(gr);
         g2.fill(shp);
         setGraphicsForEdge(gr);
         g2.draw(shp);
     }

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Received on Thu Jun 15 2006 - 09:47:52 EDT