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/*
 * #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *    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
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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.roundness}. Based on
 * https://imagej.nih.gov/ij/plugins/descriptors.html.
 *
 * @author Daniel Seebacher (University of Konstanz)
 * @implNote op names='geom.roundness', label='Geometric (2D): Roundness'
 */
public class DefaultRoundness implements
	Computers.Arity1
{

	@OpDependency(name = "geom.size")
	private Function areaFunc;
	@OpDependency(name = "geom.majorAxis")
	private Function majorAxisFunc;

	/**
	 * TODO
	 *
	 * @param input
	 * @param roundness
	 */
	@Override
	public void compute(final Polygon2D input, final DoubleType roundness) {
		roundness.set(4 * (areaFunc.apply(input).getRealDouble() / (Math.PI * Math
			.pow(majorAxisFunc.apply(input).getRealDouble(), 2))));
	}

}