Application: gvSIG desktop

package com.iver.cit.gvsig.project.documents.table.operators;

import java.awt.geom.Point2D;

import org.apache.bsf.BSFException;

import org.apache.bsf.BSFManager;

import com.iver.cit.gvsig.ExpresionFieldExtension;

import com.iver.cit.gvsig.fmap.MapContext;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.core.FShape;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.drivers.DriverIOException;

import com.iver.cit.gvsig.fmap.layers.ReadableVectorial;

import com.iver.cit.gvsig.project.documents.table.GraphicOperator;

import com.iver.cit.gvsig.project.documents.table.IOperator;

import com.iver.cit.gvsig.project.documents.table.Index;

/**

 * @author Vicente Caballero Navarro

 */

public class Perimeter extends GraphicOperator{

        public String addText(String s) {

                return s.concat(toString()+"()");

        }

        public double process(Index index) throws DriverIOException {

                ReadableVectorial adapter = getLayer().getSource();

                   IGeometry geom=adapter.getShape(index.get());

                   Double[][] xsys=getXY(geom);

            double dist = 0;

        double distAll = 0;

        ViewPort vp = getLayer().getMapContext().getViewPort();

        for (int i = 0; i < (xsys[0].length - 1); i++) {

            dist = 0;

            Point2D p = new Point2D.Double(xsys[0][i].doubleValue(), xsys[1][i].doubleValue());//vp.toMapPoint(new Point(event.getXs()[i].intValue(), event.getYs()[i].intValue()));

            Point2D p2 = new Point2D.Double(xsys[0][i + 1].doubleValue(), xsys[1][i + 1].doubleValue());//vp.toMapPoint(new Point(event.getXs()[i + 1].intValue(), event.getYs()[i + 1].intValue()));

            dist = vp.distanceWorld(p,p2);

            System.out.println("distancia parcial = "+dist);

            distAll += dist;

        }

        int distanceUnits=vp.getDistanceUnits();

                return distAll/MapContext.CHANGEM[distanceUnits];

        }

        public void eval(BSFManager interpreter) throws BSFException {

                interpreter.declareBean("perimeter",this,Perimeter.class);

                interpreter.eval(ExpresionFieldExtension.BEANSHELL,null,-1,-1,"double perimeter(){return perimeter.process(indexRow);};");

        }

        public String toString() {

                return "perimeter";

        }

        public boolean isEnable() {

                if (getLayer()==null)

                        return false;

                ReadableVectorial adapter = getLayer().getSource();

                int type=FShape.POINT;

                try {

                        type=adapter.getShapeType();

                } catch (DriverIOException e) {

                        e.printStackTrace();

                }

                return (getType()==IOperator.NUMBER && (type==FShape.POLYGON || type==FShape.LINE));

        }

}