/*
 * #%L
 * ImgLib2: a general-purpose, multidimensional image processing library.
 * %%
 * Copyright (C) 2009 - 2013 Stephan Preibisch, Tobias Pietzsch, Barry DeZonia,
 * Stephan Saalfeld, Albert Cardona, Curtis Rueden, Christian Dietz, Jean-Yves
 * Tinevez, Johannes Schindelin, Lee Kamentsky, Larry Lindsey, Grant Harris,
 * Mark Hiner, Aivar Grislis, Martin Horn, Nick Perry, Michael Zinsmaier,
 * Steffen Jaensch, Jan Funke, Mark Longair, and Dimiter Prodanov.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
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 * #L%
 */

package org.knime.knip.tracking.data;

import net.imglib2.Cursor;
import net.imglib2.IterableInterval;
import net.imglib2.ops.operation.UnaryOperation;
import net.imglib2.type.logic.BitType;

/**
 * @author Felix Schoenenberger (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 */
public final class BitMaskCentroid implements
        UnaryOperation<IterableInterval<BitType>, double[]> {

    private final long[] offset;

    public BitMaskCentroid(long[] offset) {
        this.offset = offset;
    }

    @Override
    public final double[] compute(final IterableInterval<BitType> op,
            final double[] r) {

        final Cursor<BitType> c = op.cursor();

        int ctr = 0;
        while (c.hasNext()) {
            if (!c.next().get())
                continue;

            for (int i = 0; i < r.length; i++) {
                r[i] += (c.getDoublePosition(i) + offset[i]);
            }

            ctr++;
        }

        for (int i = 0; i < r.length; i++) {
            r[i] /= ctr;
        }

        return r;
    }

    @Override
    public UnaryOperation<IterableInterval<BitType>, double[]> copy() {
        return new BitMaskCentroid(offset);
    }
}