Application: gvSIG desktop » gvSIG tools: Expression Field

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 *   gvSIG. Desktop Geographic Information System.

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package org.gvsig.expressionfield.project.documents.table.operators;

import java.awt.geom.Point2D;

import java.util.ArrayList;

import org.apache.bsf.BSFException;

import org.apache.bsf.BSFManager;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.messages.NotificationManager;

import org.gvsig.expressionfield.ExpressionFieldExtension;

import org.gvsig.expressionfield.project.documents.table.GraphicOperator;

import org.gvsig.expressionfield.project.documents.table.IOperator;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontext.ViewPort;

/**

 * @author Vicente Caballero Navarro

 */

public class Perimeter extends GraphicOperator{

        public String addText(String s) {

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

        }

        public double process(Feature feature) {

//                ReadableVectorial adapter = getLayer().getSource();

                   org.gvsig.fmap.geom.Geometry geom=null;

                        geom = feature.getDefaultGeometry();//adapter.getShape(index.get());

                ArrayList parts=getXY(geom);

                   double perimeter=0;

                   for (int j=0;j<parts.size();j++){

                   Double[][] xsys=(Double[][])parts.get(j);//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();

                perimeter+= distAll/MapContext.getDistanceTrans2Meter()[distanceUnits];

                   }

                   return perimeter;

        }

        public void eval(BSFManager interpreter) throws BSFException {

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

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

                interpreter.exec(ExpressionFieldExtension.JYTHON,null,-1,-1,"def perimeter():\n" +

                                "  return jperimeter.process(featureContainer.getFeature())");

        }

        public String toString() {

                return "perimeter";

        }

        public boolean isEnable() {

                if (getLayer()==null)

                        return false;

                int geomType=org.gvsig.fmap.geom.Geometry.TYPES.POINT;

                try {

                        FeatureStore store = getLayer().getFeatureStore();

                        geomType = store.getDefaultFeatureType().getAttributeDescriptor(store.getDefaultFeatureType().getDefaultGeometryAttributeIndex()).getGeometryType();

                } catch (DataException e) {

                        NotificationManager.addError(e);

                }

                return (getType()==IOperator.NUMBER &&

                    (geomType==org.gvsig.fmap.geom.Geometry.TYPES.SURFACE

            || geomType==org.gvsig.fmap.geom.Geometry.TYPES.MULTISURFACE

            || geomType==org.gvsig.fmap.geom.Geometry.TYPES.CURVE

            || geomType==org.gvsig.fmap.geom.Geometry.TYPES.MULTICURVE

                    ));

        }

        public String getTooltip(){

                return PluginServices.getText(this,"operator")+":  "+addText("")+"\n"+getDescription();

        }

        public String getDescription() {

        return PluginServices.getText(this, "returns") + ": " +

        PluginServices.getText(this, "numeric_value") + "\n" +

        PluginServices.getText(this, "description") + ": " +

        "Returns the perimeter of polygon or line geometry  of this row.";

    }

}