001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.img.interpolation;
020
021public class Quadratic implements Interpolation
022{
023    public double f(double x) {
024        if (x < 0.0)
025            x = -x;
026        if (x < 0.5)
027            return 0.75 - x * x;
028        if (x < 1.5) {
029            x -= 1.5;
030            return 0.5 * x * x;
031        }
032        return 0.0;
033    }
034    
035    public double getSupport() {
036        return 1.5;
037    }
038}