/* Copyright (C) 2014 A.Vontobel  
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * The license is in LICENCE-GPL.txt.
 * If not, see http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
 */

package net.sf.drawj2d.cmd.statics;

import org.hecl.*;

/**
 * StatMultiplyCmd implements the "stat.multiply"/"***" command, which 
 * scales a force by multiplication. The application point is not touched.
 */

public class StatMultiplyCmd implements Command {
    boolean debug = false;
    
    public StatMultiplyCmd () {
    }
    
    @Override
    public Thing cmdCode(Interp interp, Thing[] argv) throws HeclException {
        assert argv.length > 0;
        if (debug) System.out.println(argv[0].toString());
        
        if (argv.length != 3) throw new HeclException ("Illegal nb of arguments.");
        
        double factor;
        Thing[] factorargv = ListThing.getArray(argv[1]);
        if (factorargv.length != 1) throw new HeclException ("Illegal argument format. 'nb \"nb nb nb nb\"' expected.");
        factor = NumberThing.asNumber(factorargv[0]).doubleValue();
        
        Thing[] currentargv = ListThing.getArray(argv[2]);
        if (currentargv.length != 4) throw new HeclException ("Illegal argument format. 'nb \"x0 y0 Fx Fy\"' expected.");
        double x0 = NumberThing.asNumber(currentargv[0]).doubleValue();
        double y0 = NumberThing.asNumber(currentargv[1]).doubleValue();
        double Fx = NumberThing.asNumber(currentargv[2]).doubleValue();
        double Fy = NumberThing.asNumber(currentargv[3]).doubleValue();
        
        Fx *= factor;
        Fy *= factor;

        String xstr = StringThing.get(DoubleThing.create(x0));
        String ystr = StringThing.get(DoubleThing.create(y0));
        String Fxstr = StringThing.get(DoubleThing.create(Fx));
        String Fystr = StringThing.get(DoubleThing.create(Fy));
        String answer = xstr + " " + ystr + " " + Fxstr + " " + Fystr;
        
	return new Thing(answer);
    }
}