graphicsmaker.java

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package com.esri.webadf.sample;

import java.util.Arrays;

import org.apache.axis.types.UnsignedByte;

import com.esri.adf.web.ags.data.AGSMapFunctionality;
import com.esri.adf.web.ags.data.AGSMapResource;
import com.esri.adf.web.data.WebContext;
import com.esri.adf.web.data.WebMap;
import com.esri.adf.web.data.geometry.WebPoint;
import com.esri.adf.web.faces.event.MapEvent;
import com.esri.arcgisws.EsriSimpleMarkerStyle;
import com.esri.arcgisws.GraphicElement;
import com.esri.arcgisws.MapDescription;
import com.esri.arcgisws.MarkerElement;
import com.esri.arcgisws.PointN;
import com.esri.arcgisws.RgbColor;
import com.esri.arcgisws.SimpleMarkerSymbol;

public class GraphicsMaker {
	
	private WebContext webContext = null;

	public WebContext getWebContext() {
		return webContext;
	}

	public void setWebContext(WebContext webContext) {
		this.webContext = webContext;
	}
	
	
	public String addText(){
		
		return null;
	}
	
	public void addPoint(MapEvent event){
		//get the point the user clicked and convert it from image coordinates to map coordinates
		WebMap webMap = webContext.getWebMap();
		WebPoint point = (WebPoint) event.getWebGeometry().toMapGeometry(webMap);

		//get the mapResource so we can get to the MapDescription
		AGSMapResource mapResource = (AGSMapResource) webContext.getResources().get("ags1");		
		AGSMapFunctionality mapFunctionality = (AGSMapFunctionality) mapResource.getFunctionality("map");
		MapDescription mapDescription = mapFunctionality.getMapDescription();
		
		//Get any existing graphic elements from the map description
		GraphicElement[] existingElements = mapDescription.getCustomGraphics();
		
		GraphicElement[] graphicElements = null;
		if(existingElements == null){
			graphicElements = new GraphicElement[1];
		} else {
			//there were already graphic elements so we need to copy them to our array
			graphicElements = new GraphicElement[existingElements.length + 1];
			System.arraycopy(existingElements, 0, graphicElements, 0, existingElements.length );
		}
		
		//make a marker element and set it's properties
		MarkerElement markerElement = new MarkerElement();
		PointN pointN = new PointN(point.getX(), point.getY(), null, null, null, null);
		markerElement.setPoint(pointN);
		
		//make a marker symbol for the element
		SimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbol();	
		markerSymbol.setSize(15.0);
		markerSymbol.setStyle(EsriSimpleMarkerStyle.esriSMSCircle);
		RgbColor color = new RgbColor();
		color.setAlphaValue(new UnsignedByte(255));
		color.setBlue(new UnsignedByte(0));
		color.setRed(new UnsignedByte(255));
		color.setGreen(new UnsignedByte(0));
		markerSymbol.setColor(color);
		markerSymbol.setOutlineColor(color);
		
		markerElement.setSymbol(markerSymbol);
		
		//add the markerElement to the array of graphicElements
		graphicElements[graphicElements.length-1] = markerElement;
		
		//set the custom graphics, this is a remote call
		mapDescription.setCustomGraphics(graphicElements);
			
		//refresh the context because the Mapdescription has changed and we want to see the changes
		//in the map that is drawn
		webContext.refresh();
		
		
	}

}