FloatArray2D.java

/*
 * This file is part of the LIRE project: http://lire-project.net
 * LIRE 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.
 *
 * LIRE 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 LIRE; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * We kindly ask you to refer the any or one of the following publications in
 * any publication mentioning or employing Lire:
 *
 * Lux Mathias, Savvas A. Chatzichristofis. Lire: Lucene Image Retrieval –
 * An Extensible Java CBIR Library. In proceedings of the 16th ACM International
 * Conference on Multimedia, pp. 1085-1088, Vancouver, Canada, 2008
 * URL: http://doi.acm.org/10.1145/1459359.1459577
 *
 * Lux Mathias. Content Based Image Retrieval with LIRE. In proceedings of the
 * 19th ACM International Conference on Multimedia, pp. 735-738, Scottsdale,
 * Arizona, USA, 2011
 * URL: http://dl.acm.org/citation.cfm?id=2072432
 *
 * Mathias Lux, Oge Marques. Visual Information Retrieval using Java and LIRE
 * Morgan & Claypool, 2013
 * URL: http://www.morganclaypool.com/doi/abs/10.2200/S00468ED1V01Y201301ICR025
 *
 * Copyright statement:
 * --------------------
 * (c) 2002-2013 by Mathias Lux (mathias@juggle.at)
 *     http://www.semanticmetadata.net/lire, http://www.lire-project.net
 */
package net.semanticmetadata.lire.imageanalysis.features.local.sift;

public class FloatArray2D extends FloatArray {
    //    public float data[] = null;
    public int width = 0;
    public int height = 0;


    public FloatArray2D(int width, int height) {
        data = new float[width * height];
        this.width = width;
        this.height = height;
    }

    public FloatArray2D(float[] data, int width, int height) {
        this.data = data;
        this.width = width;
        this.height = height;
    }

    public FloatArray2D clone() {
        FloatArray2D clone = new FloatArray2D(width, height);
        System.arraycopy(this.data, 0, clone.data, 0, this.data.length);
        return clone;
    }

    public int getPos(int x, int y) {
        return x + width * y;
    }

    public float get(int x, int y) {
        return data[getPos(x, y)];
    }

    public float getMirror(int x, int y) {
        if (x >= width)
            x = width - (x - width + 2);

        if (y >= height)
            y = height - (y - height + 2);

        if (x < 0) {
            int tmp = 0;
            int dir = 1;

            while (x < 0) {
                tmp += dir;
                if (tmp == width - 1 || tmp == 0)
                    dir *= -1;
                x++;
            }
            x = tmp;
        }

        if (y < 0) {
            int tmp = 0;
            int dir = 1;

            while (y < 0) {
                tmp += dir;
                if (tmp == height - 1 || tmp == 0)
                    dir *= -1;
                y++;
            }
            y = tmp;
        }

        return data[getPos(x, y)];
    }

    public float getZero(int x, int y) {
        if (x >= width)
            return 0;

        if (y >= height)
            return 0;

        if (x < 0)
            return 0;

        if (y < 0)
            return 0;

        return data[getPos(x, y)];
    }

    public void set(float value, int x, int y) {
        data[getPos(x, y)] = value;
    }
}