How to use

isTranslation

method

in

org.apache.sis.referencing.datum.BursaWolfParameters

/**
 * Returns {@code true} if a transformation built from this set of parameters would perform no operation.
 * This is true when the value of all parameters is zero.
 *
 * @return {@code true} if the parameters describe no operation.
 */
public boolean isIdentity() {
  return tX == 0 && tY == 0 && tZ == 0 && isTranslation();
}

/**
 * Returns {@code true} if a transformation built from this set of parameters would perform no operation.
 * This is true when the value of all parameters is zero.
 *
 * @return {@code true} if the parameters describe no operation.
 */
public boolean isIdentity() {
  return tX == 0 && tY == 0 && tZ == 0 && isTranslation();
}

/**
 * {@inheritDoc}
 *
 * @return {@code true} if the parameters describe a translation only.
 */
@Override
public boolean isTranslation() {
  return super.isTranslation() && drX == 0 && drY == 0 && drZ == 0;
}

/**
 * {@inheritDoc}
 *
 * @return {@code true} if the parameters describe a translation only.
 */
@Override
public boolean isTranslation() {
  return super.isTranslation() && drX == 0 && drY == 0 && drZ == 0;
}

  continue;
final boolean isTranslation = parameters.isTranslation();
final Parameters values = createParameters(isTranslation ? GeocentricTranslation.PARAMETERS
            : PositionVector7Param.PARAMETERS, parameters, isTranslation);

  continue;
final boolean isTranslation = parameters.isTranslation();
final Parameters values = createParameters(isTranslation ? GeocentricTranslation.PARAMETERS
            : PositionVector7Param.PARAMETERS, parameters, isTranslation);

if (Utilities.equalsIgnoreMetadata(CommonCRS.WGS84.datum(), bwp.getTargetDatum())) {
  definition.append(" +towgs84=").append(bwp.tX).append(',').append(bwp.tY).append(',').append(bwp.tZ);
  if (!bwp.isTranslation()) {
    definition.append(',').append(bwp.rX).append(',').append(bwp.rY).append(',').append(bwp.rZ).append(',').append(bwp.dS);

if (Utilities.equalsIgnoreMetadata(CommonCRS.WGS84.datum(), bwp.getTargetDatum())) {
  definition.append(" +towgs84=").append(bwp.tX).append(',').append(bwp.tY).append(',').append(bwp.tZ);
  if (!bwp.isTranslation()) {
    definition.append(',').append(bwp.rX).append(',').append(bwp.rY).append(',').append(bwp.rZ).append(',').append(bwp.dS);

/**
 * Invokes {@link BursaWolfParameters#getPositionVectorTransformation(Date)}
 * and compares with our own matrix calculated using double arithmetic.
 */
private static MatrixSIS getPositionVectorTransformation(final BursaWolfParameters p) {
  final double   S = 1 + p.dS / BursaWolfParameters.PPM;
  final double  RS = TO_RADIANS * S;
  final Matrix4 expected = new Matrix4(
        S,  -p.rZ*RS,  +p.rY*RS,  p.tX,
    +p.rZ*RS,         S,  -p.rX*RS,  p.tY,
    -p.rY*RS,  +p.rX*RS,         S,  p.tZ,
        0,         0,         0,  1);
  final MatrixSIS matrix = MatrixSIS.castOrCopy(p.getPositionVectorTransformation(null));
  assertMatrixEquals("getPositionVectorTransformation", expected, matrix, p.isTranslation() ? 0 : 1E-14);
  return matrix;
}

/**
 * Returns the parameters for the <cite>WGS 72 to WGS 84 (2)</cite> transformation (EPSG:1238).
 * Area of validity is the World.
 */
static BursaWolfParameters createWGS72_to_WGS84() {
  final BursaWolfParameters bursaWolf = new BursaWolfParameters(GeodeticDatumMock.WGS84, Extents.WORLD);
  bursaWolf.tZ = 4.5;
  bursaWolf.rZ = 0.554;
  bursaWolf.dS = 0.219;
  bursaWolf.verify(PrimeMeridianMock.GREENWICH);
  assertFalse("isIdentity",    bursaWolf.isIdentity());
  assertFalse("isTranslation", bursaWolf.isTranslation());
  return bursaWolf;
}

/**
 * Returns the parameters for the <cite>NTF to WGS 84 (1)</cite> transformation (EPSG:1193).
 * Area of validity is France - onshore - mainland and Corsica.
 * This transformation uses only translation parameters.
 */
static BursaWolfParameters createNTF_to_WGS84() {
  final BursaWolfParameters bursaWolf = new BursaWolfParameters(GeodeticDatumMock.WGS84, Extents.WORLD);
  bursaWolf.tX = -168;
  bursaWolf.tY =  -60;
  bursaWolf.tZ =  320;
  bursaWolf.verify(PrimeMeridianMock.GREENWICH);
  assertFalse("isIdentity",    bursaWolf.isIdentity());
  assertTrue ("isTranslation", bursaWolf.isTranslation());
  return bursaWolf;
}

final boolean isTranslation = parameters.isTranslation();
final ParameterDescriptorGroup descriptor;

final boolean isTranslation = parameters.isTranslation();
final ParameterDescriptorGroup descriptor;

/**
 * Returns the parameters for the <cite>ED87 to WGS 84 (1)</cite> transformation (EPSG:1146).
 * Area of validity is the North Sea: 5.05°W to 11.13°E in longitude and 51.04°N to 62.0°N in latitude.
 */
static BursaWolfParameters createED87_to_WGS84() {
  final BursaWolfParameters bursaWolf = new BursaWolfParameters(GeodeticDatumMock.WGS84, new DefaultExtent("Europe - North Sea",
      new DefaultGeographicBoundingBox(-5.05, 11.13, 51.04, 62.0), null, null));
  bursaWolf.tX =  -82.981;
  bursaWolf.tY =  -99.719;
  bursaWolf.tZ = -110.709;
  bursaWolf.rX =   -0.5076;
  bursaWolf.rY =    0.1503;
  bursaWolf.rZ =    0.3898;
  bursaWolf.dS =   -0.3143;
  bursaWolf.verify(PrimeMeridianMock.GREENWICH);
  assertFalse("isIdentity",    bursaWolf.isIdentity());
  assertFalse("isTranslation", bursaWolf.isTranslation());
  return bursaWolf;
}

if (period == null && isTranslation()) {
  final Matrix4 matrix = new Matrix4();
  matrix.m03 = tX;

if (period == null && isTranslation()) {
  final Matrix4 matrix = new Matrix4();
  matrix.m03 = tX;