CmdCentroid.java

package org.geogebra.common.kernel.advanced;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.commands.CommandProcessor;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoPolygon;
import org.geogebra.common.main.MyError;

/**
 * Centroid[ <Polygon> ]
 */
public class CmdCentroid extends CommandProcessor {

	/**
	 * Create new command processor
	 * 
	 * @param kernel
	 *            kernel
	 */
	public CmdCentroid(Kernel kernel) {
		super(kernel);
	}

	@Override
	final public GeoElement[] process(Command c) throws MyError {
		int n = c.getArgumentNumber();
		boolean[] ok = new boolean[n];
		GeoElement[] arg;

		switch (n) {
		case 1:
			arg = resArgs(c);
			ok[0] = arg[0].isGeoPolygon();
			if (ok[0]) {

				AlgoCentroidPolygon algo = new AlgoCentroidPolygon(cons,
						c.getLabel(), (GeoPolygon) arg[0]);

				GeoElement[] ret = { (GeoElement) algo.getPoint() };
				return ret;
			}
			throw argErr(app, c, arg[0]);

		default:
			throw argNumErr(app, c, n);
		}
	}
}