regionoverlay.java

一个基于PlaceLab的室内和室外的智能导航系统

package org.placelab.demo.mapview;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import org.placelab.util.swt.Glyph;

/**
 * A region overlay displays {#link RegionBacking} objects on a {#link MapView}.
 * It also allows the regions to be manipulated by the user through the viewport.
 */
public class RegionOverlay extends MapViewOverlay {

	public RegionOverlay(MapView view) {
		super(view);
	}
	
	public void mapChanged(MapBacking newMap) {
		Vector newGlyphs = new Vector();
		Enumeration i = glyphs.elements();
		while(i.hasMoreElements()) {
			RegionGlyph g = (RegionGlyph)i.nextElement();
			RegionBacking rb = g.region;
			g.dispose();
			g = new RegionGlyph(this.view, rb);
			newGlyphs.addElement(g);
		}
		glyphs = newGlyphs;
	}
	
	public void addRegion(RegionBacking region) {
		RegionGlyph rg = new RegionGlyph(this.view, region);
		glyphs.addElement(rg);
	}

	public void addRegions(Hashtable regions) {
		if(regions == null) return;
		Enumeration e = regions.elements();
		while(e.hasMoreElements()) {
			this.addRegion((RegionBacking)e.nextElement());
		}
	}
	
	public Glyph getTopGlyph() {
		return (Glyph)glyphs.elementAt(glyphs.size() - 1);
	}

	public String getName() {
		return "RegionOverlay";
	}

}