A virtual image of ImgLib2 with a filled ROI

gistfile1.java

// Goal: a virtual image (a function, if you want)
// with dimensions 512, 512
// and a background of value 0
// and a ROI of dimensions 200, 200 at position 100, 100
// filled with a value 127.

// ERROR: the ROI has the right dimensions
// but its top-left is positioned with negative coordinates.

		// A virtual image with a ROI filled with value 127
		RandomAccessibleInterval<FloatType> img1 =
			// The 'image'
			Views.interval(
				// The outside, with value 0
				Views.extendValue(
					// The ROI filled with value 127
					Views.interval(
						new ConstantRandomAccessible<FloatType>(new FloatType(127), 2),
						// The domain of the ROI
						new long[]{100, 100},
						new long[]{199, 199}),
					new FloatType(0)),
				// The domain of the image
				new long[]{0, 0},
				new long[]{511, 511});