private static Unit tryCreateNormalized()

in commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/twod/Vector2D.java [708:745]

• 28 lines of code
• 5 McCabe index (conditional complexity)

        private static Unit tryCreateNormalized(final double x, final double y, final boolean throwOnFailure) {

            // Compute the inverse norm directly. If the result is a non-zero real number,
            // then we can go ahead and construct the unit vector immediately. If not,
            // we'll do some extra work for edge cases.
            final double norm = Vectors.norm(x, y);
            final double normInv = 1.0 / norm;
            if (Vectors.isRealNonZero(normInv)) {
                return new Unit(
                        x * normInv,
                        y * normInv);
            }

            // Direct computation did not work. Try scaled versions of the coordinates
            // to handle overflow and underflow.
            final double scaledX;
            final double scaledY;

            final double maxCoord = Math.max(Math.abs(x), Math.abs(y));
            if (maxCoord > UNSCALED_MAX) {
                scaledX = x * SCALE_DOWN_FACTOR;
                scaledY = y * SCALE_DOWN_FACTOR;
            } else {
                scaledX = x * SCALE_UP_FACTOR;
                scaledY = y * SCALE_UP_FACTOR;
            }

            final double scaledNormInv = 1.0 / Vectors.norm(scaledX, scaledY);

            if (Vectors.isRealNonZero(scaledNormInv)) {
                return new Unit(
                        scaledX * scaledNormInv,
                        scaledY * scaledNormInv);
            } else if (throwOnFailure) {
                throw Vectors.illegalNorm(norm);
            }
            return null;
        }