Add transform test

Author: bnorthan

src/test/java/net/imagej/ops/transform/realTransform/RealTransformTest.java

@@ -0,0 +1,52 @@
+
+package net.imagej.ops.transform.realTransform;
+
+import static org.junit.Assert.assertEquals;
+
+import net.imagej.ops.AbstractOpTest;
+import net.imglib2.Cursor;
+import net.imglib2.RandomAccess;
+import net.imglib2.RandomAccessibleInterval;
+import net.imglib2.img.Img;
+import net.imglib2.interpolation.randomaccess.LanczosInterpolatorFactory;
+import net.imglib2.realtransform.AffineTransform2D;
+import net.imglib2.type.numeric.integer.UnsignedByteType;
+import net.imglib2.view.Views;
+
+import org.junit.Test;
+
+public class RealTransformTest extends AbstractOpTest {
+
+	@Test
+	public void regressionTest() throws Exception {
+
+		Img<UnsignedByteType> image = (Img<UnsignedByteType>) this
+			.openUnsignedByteType(getClass(), "lowresbridge.tif");
+		Img<UnsignedByteType> expectedOutput = (Img<UnsignedByteType>) this
+			.openUnsignedByteType(getClass(), "rotatedscaledcenter.tif");
+
+		AffineTransform2D transform = new AffineTransform2D();
+
+		transform.translate(-image.dimension(0)/2,-image.dimension(0)/2);
+		transform.rotate(1);
+		transform.scale(0.5);
+		transform.translate(image.dimension(0)/2,image.dimension(0)/2);
+
+		RandomAccessibleInterval<UnsignedByteType> actualOutput=ops.transform().realTransform(image, transform);
+		
+		// compare the output image data to that stored in the file.
+		Cursor<UnsignedByteType> cursor = Views.iterable(actualOutput)
+			.localizingCursor();
+		RandomAccess<UnsignedByteType> actualRA = actualOutput.randomAccess();
+		RandomAccess<UnsignedByteType> expectedRA = expectedOutput.randomAccess();
+
+		while (cursor.hasNext()) {
+			cursor.fwd();
+			actualRA.setPosition(cursor);
+			expectedRA.setPosition(cursor);
+			assertEquals(expectedRA.get().get(), actualRA.get().get(), 0);
+		}
+
+	}
+
+}