CmdParabola.java

package org.geogebra.common.kernel.commands;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.kernelND.GeoLineND;
import org.geogebra.common.kernel.kernelND.GeoPointND;
import org.geogebra.common.main.MyError;

/**
 * Parabola[ <GeoPoint>, <GeoLine> ]
 */
public class CmdParabola extends CommandProcessor {

	/**
	 * Create new command processor
	 * 
	 * @param kernel
	 *            kernel
	 */
	public CmdParabola(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 2:
			arg = resArgs(c);
			if ((ok[0] = (arg[0].isGeoPoint()))
					&& (ok[1] = (arg[1].isGeoLine()))) {
				GeoElement[] ret = { parabola(c.getLabel(), (GeoPointND) arg[0],
						(GeoLineND) arg[1]) };
				return ret;
			}
			throw argErr(app, c, getBadArg(ok, arg));

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

	/**
	 * 
	 * @param label
	 *            label
	 * @param a
	 *            point
	 * @param d
	 *            line
	 * @return point-line parabola
	 */
	protected GeoElement parabola(String label, GeoPointND a, GeoLineND d) {
		return getAlgoDispatcher().Parabola(label, a, d);
	}
}