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 * Image processing operations for SciJava Ops.
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package org.scijava.ops.image.transform.offsetView;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.function.BiFunction;

import org.scijava.ops.image.AbstractOpTest;
import net.imglib2.FinalInterval;
import net.imglib2.Interval;
import net.imglib2.RandomAccessible;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.img.Img;
import net.imglib2.img.array.ArrayImgFactory;
import net.imglib2.type.numeric.real.DoubleType;
import net.imglib2.view.IntervalView;
import net.imglib2.view.MixedTransformView;
import net.imglib2.view.Views;

import org.junit.jupiter.api.Test;
import org.scijava.function.Functions;
import org.scijava.ops.api.OpBuilder;
import org.scijava.types.Nil;

/**
 * Tests {@link org.scijava.ops.image.Ops.Transform.OffsetView} ops.
 * <p>
 * This test only checks if the op call works with all parameters and that the
 * result is equal to that of the {@link Views} method call. It is not a
 * correctness test of {@link Views} itself.
 * </p>
 *
 * @author Tim-Oliver Buchholz (University of Konstanz)
 */
public class OffsetViewTest extends AbstractOpTest {

	@Test
	public void testDefaultOffset() {
		BiFunction<RandomAccessible<DoubleType>, long[], MixedTransformView<DoubleType>> offsetFunc =
			OpBuilder.matchFunction(ops, "transform.offsetView",
				new Nil<RandomAccessible<DoubleType>>()
				{}, new Nil<long[]>() {}, new Nil<MixedTransformView<DoubleType>>() {});

		Img<DoubleType> img = new ArrayImgFactory<>(new DoubleType()).create(
			new int[] { 10, 10 });

		MixedTransformView<DoubleType> il2 = Views.offset(
			(RandomAccessible<DoubleType>) img, new long[] { 2, 2 });
		MixedTransformView<DoubleType> opr = offsetFunc.apply(img, new long[] { 2,
			2 });

		for (int i = 0; i < il2.getTransformToSource().getMatrix().length; i++) {
			for (int j = 0; j < il2.getTransformToSource()
				.getMatrix()[i].length; j++)
			{
				assertEquals(il2.getTransformToSource().getMatrix()[i][j], opr
					.getTransformToSource().getMatrix()[i][j], 1e-10);
			}
		}
	}

	@Test
	public void testDefaultOffsetInterval() {
		BiFunction<RandomAccessibleInterval<DoubleType>, Interval, IntervalView<DoubleType>> offsetFunc =
			OpBuilder.matchFunction(ops, "transform.offsetView",
				new Nil<RandomAccessibleInterval<DoubleType>>()
				{}, new Nil<Interval>() {}, new Nil<IntervalView<DoubleType>>() {});

		Img<DoubleType> img = new ArrayImgFactory<>(new DoubleType()).create(
			new int[] { 10, 10 });

		IntervalView<DoubleType> il2 = Views.offsetInterval(img, new FinalInterval(
			new long[] { 2, 2 }, new long[] { 9, 9 }));
		IntervalView<DoubleType> opr = offsetFunc.apply(img, new FinalInterval(
			new long[] { 2, 2 }, new long[] { 9, 9 }));

		assertEquals(il2.realMax(0), opr.realMax(0), 1e-10);
		assertEquals(il2.realMin(0), opr.realMin(0), 1e-10);
		assertEquals(il2.realMax(1), opr.realMax(1), 1e-10);
		assertEquals(il2.realMin(1), opr.realMin(1), 1e-10);
	}

	@Test
	public void testDefaultOffsetStartEnd() {
		Functions.Arity3<RandomAccessibleInterval<DoubleType>, long[], long[], IntervalView<DoubleType>> offsetFunc =
			OpBuilder.matchFunction(ops, "transform.offsetView",
				new Nil<RandomAccessibleInterval<DoubleType>>()
				{}, new Nil<long[]>() {}, new Nil<long[]>() {},
				new Nil<IntervalView<DoubleType>>()
				{});

		Img<DoubleType> img = new ArrayImgFactory<>(new DoubleType()).create(
			new int[] { 10, 10 });

		IntervalView<DoubleType> il2 = Views.offsetInterval(img, new long[] { 2,
			2 }, new long[] { 9, 9 });
		IntervalView<DoubleType> opr = offsetFunc.apply(img, new long[] { 2, 2 },
			new long[] { 9, 9 });

		assertEquals(il2.realMax(0), opr.realMax(0), 1e-10);
		assertEquals(il2.realMin(0), opr.realMin(0), 1e-10);
		assertEquals(il2.realMax(1), opr.realMax(1), 1e-10);
		assertEquals(il2.realMin(1), opr.realMin(1), 1e-10);
	}
}
