/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, University of Konstanz and Brian Northan.
 * %%
 * 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
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package net.imagej.ops.geom.geom2d;

import net.imagej.ops.Ops;
import net.imagej.ops.special.chain.RTs;
import net.imagej.ops.special.function.UnaryFunctionOp;
import net.imagej.ops.special.hybrid.AbstractUnaryHybridCF;
import net.imglib2.roi.geometric.Polygon;
import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.plugin.Plugin;

/**
 * Generic implementation of {@code geom.mainElongation}.
 * 
 * @author Daniel Seebacher (University of Konstanz)
 */
@Plugin(type = Ops.Geometric.MainElongation.class, label = "Geometric (2D): Elongation")
public class DefaultElongation extends AbstractUnaryHybridCF<Polygon, DoubleType>
		implements Ops.Geometric.MainElongation {

	private UnaryFunctionOp<Polygon, DoubleType> minorAxisFunc;
	private UnaryFunctionOp<Polygon, DoubleType> majorAxisFunc;

	@Override
	public void initialize() {
		minorAxisFunc = RTs.function(ops(), Ops.Geometric.MinorAxis.class, in());
		majorAxisFunc = RTs.function(ops(), Ops.Geometric.MajorAxis.class, in());
	}

	@Override
	public void compute1(final Polygon input, final DoubleType output) {
		output.set(1d - minorAxisFunc.compute1(input).getRealDouble() / majorAxisFunc.compute1(input).getRealDouble());
	}

	@Override
	public DoubleType createOutput(Polygon input) {
		return new DoubleType();
	}

}

/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, University of Konstanz and Brian Northan.
 * %%
 * 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
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package net.imagej.ops.geom.geom2d;

import java.util.List;

import net.imagej.ops.Ops;
import net.imagej.ops.special.function.Functions;
import net.imagej.ops.special.function.UnaryFunctionOp;
import net.imagej.ops.special.hybrid.AbstractUnaryHybridCF;
import net.imglib2.RealLocalizable;
import net.imglib2.roi.geometric.Polygon;
import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.plugin.Plugin;

/**
 * Generic implementation of {@code geom.mainElongation} based on
 * http://www.math.uci.edu/icamp/summer/research_11/park/
 * shape_descriptors_survey.pdf.
 * 
 * @author Tim-Oliver Buchholz, University of Konstanz
 */
@Plugin(type = Ops.Geometric.MainElongation.class, label = "Geometric (2D): Elongation")
public class DefaultElongation extends AbstractUnaryHybridCF<Polygon, DoubleType>
		implements Ops.Geometric.MainElongation {

	private UnaryFunctionOp<Polygon, Polygon> minimumBoundingBoxFunc;

	@Override
	public void initialize() {
		minimumBoundingBoxFunc = Functions.unary(ops(), Ops.Geometric.SmallestEnclosingBoundingBox.class, Polygon.class,
				in());
	}

	@Override
	public void compute1(final Polygon input, final DoubleType output) {
		final List<? extends RealLocalizable> minBB = minimumBoundingBoxFunc.compute1(input).getVertices();

		final RealLocalizable p1 = minBB.get(0);
		final RealLocalizable p2 = minBB.get(1);
		final RealLocalizable p3 = minBB.get(2);

		double width = Math.sqrt(Math.pow(p1.getDoublePosition(0) - p2.getDoublePosition(0), 2)
				+ Math.pow(p1.getDoublePosition(1) - p2.getDoublePosition(1), 2));
		double length = Math.sqrt(Math.pow(p2.getDoublePosition(0) - p3.getDoublePosition(0), 2)
				+ Math.pow(p2.getDoublePosition(1) - p3.getDoublePosition(1), 2));

		if (width > length) {
			double tmp = width;
			width = length;
			length = tmp;
		}
		output.set(1d - (width / length));
	}

	@Override
	public DoubleType createOutput(Polygon input) {
		return new DoubleType();
	}

}

Fix elongation implementation.