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package org.gwtopenmaps.openlayers.client.geometry;

import org.gwtopenmaps.openlayers.client.Projection;
import org.gwtopenmaps.openlayers.client.util.JObjectArray;
import org.gwtopenmaps.openlayers.client.util.JSObject;

/**
 * @author Edwin Commandeur - Atlis EJS
 *
 */
public class Polygon extends Collection {

    protected Polygon(JSObject element){
        super(element);
    }

    public static Polygon narrowToPolygon(JSObject polygon){
        return (polygon == null)?null: new Polygon(polygon);
    }
    
    public Polygon(LinearRing[] rings){
        this(PolygonImpl.create((new JObjectArray(rings)).getJSObject()));
    }
    
    /**
     * Polygons are composed of LinearRing geometries.
     * LinearRing geometries are MultiPoint geometries, whose components are Points.
     * The first and last component of a LinearRing is the same point, 
     * even if a LinearRing is instantiated with an array of Points whose first and last point are not the same. 
     * @return Array of LinearRing Objects
     */
    public LinearRing[] getComponents(){
        int max = getNumberOfComponents();
        LinearRing[] components = new LinearRing[max];
        for(int i = 0; i < max; i++){
            components[i] = LinearRing.narrowToLinearRing(getComponent(i));
        }
        return components;
    }
    
    /**
     * Determine if the input geometry intersects this one.
     * @param geometry  Any type of geometry.
     * @return The input geometry intersects this one.
     */
    public boolean intersects(Geometry geometry) {
		return PolygonImpl.intersects(getJSObject(), geometry.getJSObject());
	}
    
    
    public double getArea() {
		return PolygonImpl.getArea(getJSObject());
	}

	public double getGeodesicArea(Projection projection) {
		return PolygonImpl.getGeodesicArea(getJSObject(),
				projection.getJSObject());
	}
	
}