/* Copyright (C) 2016 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;

import org.hecl.*;

/**
 * OpacityCmd implements the "opacity" command, which sets the transparency.
 */

public class OpacityCmd implements Command {
    API api;
    boolean debug = false;
    
    public OpacityCmd (API api) {
        this.api = api;
    }
    
    @Override
    public Thing cmdCode(Interp interp, Thing[] argv) throws HeclException {
        assert argv.length > 0;
        if (debug) System.out.println(argv[0].toString());
        
        float opacity;
        switch (argv.length - 1) {
            case 0:
                opacity = 1.0f;
                break;
            case 1:
                opacity = NumberThing.asNumber(argv[1]).floatValue();
                break;
            default:
                throw new HeclException("Illegal nb of arguments.");
        }
        api.opacity(opacity);
	return null;
    }
}