/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2015 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.awt.geom.Area;

import net.imagej.ops.AbstractFunctionOp;
import net.imagej.ops.Ops;
import net.imglib2.RealLocalizable;
import net.imglib2.roi.geometric.Polygon;
import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.Priority;
import org.scijava.plugin.Plugin;

/**
 * Specific implementation of {@link Area} for a Polygon.
 * 
 * @author Daniel Seebacher, University of Konstanz.
 */
@Plugin(type = Ops.Geometric.Size.class, label = "Geometric (2D): Size",
	priority = Priority.VERY_HIGH_PRIORITY)
public class DefaultSizePolygon extends AbstractFunctionOp<Polygon, DoubleType>
	implements Ops.Geometric.Size
{

	@Override
	public DoubleType compute(final Polygon input) {
		double sum = 0;
		for (int i = 0; i < input.getVertices().size(); i++) {

			RealLocalizable p0 = input.getVertices().get(i % input.getVertices()
				.size());
			RealLocalizable p1 = input.getVertices().get((i + 1) % input.getVertices()
				.size());

			double p0_x = p0.getDoublePosition(0);
			double p0_y = p0.getDoublePosition(1);
			double p1_x = p1.getDoublePosition(0);
			double p1_y = p1.getDoublePosition(1);

			sum += p0_x * p1_y - p0_y * p1_x;
		}
		return new DoubleType(Math.abs(sum) / 2d);
	}

}

/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2015 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.awt.geom.Area;

import net.imagej.ops.AbstractFunctionOp;
import net.imagej.ops.Ops;
import net.imglib2.RealLocalizable;
import net.imglib2.roi.geometric.Polygon;
import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.Priority;
import org.scijava.plugin.Plugin;

/**
 * Specific implementation of {@link Area} for a Polygon.
 * 
 * @author Daniel Seebacher, University of Konstanz.
 */
@Plugin(type = Ops.Geometric.Size.class, label = "Geometric (2D): Size",
	priority = Priority.VERY_HIGH_PRIORITY + 1)
public class DefaultSizePolygon extends AbstractFunctionOp<Polygon, DoubleType>
	implements Ops.Geometric.Size
{

	@Override
	public DoubleType compute(final Polygon input) {
		double sum = 0;
		for (int i = 0; i < input.getVertices().size(); i++) {

			RealLocalizable p0 = input.getVertices().get(i % input.getVertices()
				.size());
			RealLocalizable p1 = input.getVertices().get((i + 1) % input.getVertices()
				.size());

			double p0_x = p0.getDoublePosition(0);
			double p0_y = p0.getDoublePosition(1);
			double p1_x = p1.getDoublePosition(0);
			double p1_y = p1.getDoublePosition(1);

			sum += p0_x * p1_y - p0_y * p1_x;
		}
		return new DoubleType(Math.abs(sum) / 2d);
	}

}

Increase priority