pehorizonlookup.java

esri的ArcGIS Server超级学习模板程序（for java）

/**
 * 
 */
package com.esri.solutions.jitk.web.projection.horizon;

import com.esri.adf.web.data.geometry.WebExtent;
import com.esri.adf.web.data.geometry.WebSpatialReference;
import com.esri.sde.sdk.pe.PeCoordinateSystem;
import com.esri.sde.sdk.pe.PeGeographicCS;
import com.esri.sde.sdk.pe.PeHorizon;
import com.esri.sde.sdk.pe.PeProjectedCS;
import com.esri.sde.sdk.pe.PeProjectionException;

/**
 * @author vlad2928
 *
 */
public class PEHorizonLookup implements IHorizonLookup {

	/* (non-Javadoc)
	 * @see com.esri.solutions.jitk.web.projection.horizon.IHorizonLookup#lookup(int)
	 */


    //A pcs horizon usually has many many points....KPC
    public WebExtent lookup(int id) {

           WebExtent horizon = null;
           WebSpatialReference wsr = WebSpatialReference.getWebSpatialReference(id);

           if(wsr != null) {
               try {
                   PeCoordinateSystem cs = PeCoordinateSystem.fromString(wsr.getDefinitionString());

                   if(cs != null) {
                       if(cs instanceof PeProjectedCS) {

                           PeHorizon[] peHorizon = ((PeProjectedCS)cs).horizonPcsGenerate();
                           if(peHorizon != null && peHorizon.length > 0) {
                               double[] coords = peHorizon[0].getCoord();
                               double xmin = coords[0];
                               double xmax = xmin;
                               double ymin = coords[1];
                               double ymax = ymin;
                               int cnt = 2;
                               while (cnt < coords.length){
                                   if (coords[cnt]>xmax)
                                       xmax = coords[cnt];
                                   else if (coords[cnt]<xmin)
                                       xmin = coords[cnt];
                                   cnt++;
                                   if (coords[cnt]>ymax)
                                       ymax = coords[cnt];
                                   else if (coords[cnt]<ymin)
                                       ymin = coords[cnt];
                                   cnt++;
                               }
                               horizon = new WebExtent(xmin, ymin, xmax, ymax, wsr);
                               peHorizon[0].delete();
                           }

                       } else if(cs instanceof PeGeographicCS) {
                           //PeGeographicCS gcs = (PeGeographicCS) cs;
                           horizon = new WebExtent(-180, -90, 180, 90, wsr);
                       }
                   }

               } catch(PeProjectionException ex) {}
           }

           return horizon;
       }



    /*
    public WebExtent lookup(int id) {
		
		WebExtent horizon = null;
		WebSpatialReference wsr = WebSpatialReference.getWebSpatialReference(id);
		
		if(wsr != null) {
			try {
				PeCoordinateSystem cs = PeCoordinateSystem.fromString(wsr.getDefinitionString());
				
				if(cs != null) {
					if(cs instanceof PeProjectedCS) {
						
						PeHorizon[] peHorizon = ((PeProjectedCS)cs).horizonPcsGenerate();
						if(peHorizon != null && peHorizon.length > 0) {
							double[] coords = peHorizon[0].getCoord();
							horizon = new WebExtent(coords[0], coords[1], coords[2], coords[3], wsr);
						}
					
					} else if(cs instanceof PeGeographicCS) {
						//PeGeographicCS gcs = (PeGeographicCS) cs;
						horizon = new WebExtent(-180, -90, 180, 90, wsr);
					}
				}
					
			} catch(PeProjectionException ex) {}		
		}
		
		return horizon;
	}
    */

 public static void main(String[] sparams) {
	 //System.out.println(new PEHorizonLookup().lookup(32601));
 }
}