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/*
 * #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
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package org.scijava.ops.image.geom.geom2d;

import java.util.function.Function;

import net.imglib2.roi.geom.real.Polygon2D;
import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.function.Computers;
import org.scijava.ops.spi.OpDependency;

/**
 * Generic implementation of {@code geom.eccentricity}. The eccentricity formula
 * is based on "The Eccentricity of a Conic Section" by Ayoub B. Ayoub.
 *
 * @author Tim-Oliver Buchholz, University of Konstanz
 * @implNote op names='geom.eccentricity', label='Geometric (2D): Eccentricity'
 */
public class DefaultEccentricity implements
	Computers.Arity1
{

	@OpDependency(name = "geom.minorAxis")
	private Function minorAxisFunc;
	@OpDependency(name = "geom.majorAxis")
	private Function majorAxisFunc;

	/**
	 * TODO
	 *
	 * @param input
	 * @param eccentricity
	 */
	@Override
	public void compute(final Polygon2D input, final DoubleType eccentricity) {

		final double a = majorAxisFunc.apply(input).get() / 2.0;
		final double b = minorAxisFunc.apply(input).get() / 2.0;

		eccentricity.set(Math.sqrt(1 - Math.pow(b / a, 2)));
	}

}