Examples of org.geotools.geometry.GeneralDirectPosition

org.geotools.geometry.GeneralDirectPosition
Holds the coordinates for a position within some coordinate reference system. Since {@code DirectPosition}s, as data types, will often be included in larger objects (such as {@linkplain org.geotools.geometry.Geometry geometries}) that have references to {@link CoordinateReferenceSystem}, the {@link #getCoordinateReferenceSystem} methodmay returns {@code null} if this particular {@code DirectPosition} is includedin a larger object with such a reference to a {@linkplain CoordinateReferenceSystem coordinate reference system}. In this case, the cordinate reference system is implicitly assumed to take on the value of the containing object's {@link CoordinateReferenceSystem}.
This particular implementation of {@code DirectPosition} is said "General" because ituses an {@linkplain #ordinates array of ordinates} of an arbitrary length. If the directposition is know to be always two-dimensional, then {@link DirectPosition2D} may providesa more efficient implementation.
Most methods in this implementation are final for performance reason. @since 2.0 @source $URL$ @version $Id$ @author Martin Desruisseaux (IRD) @see DirectPosition1D @see DirectPosition2D @see java.awt.geom.Point2D

    /**
     * Transforms the specified {@code ptSrc} and stores the result in {@code ptDst}.
     */
    public DirectPosition transform(final DirectPosition ptSrc, DirectPosition ptDst) {
        if (ptDst == null) {
            ptDst = new GeneralDirectPosition(2);
        } else {
            final int dimension = ptDst.getDimension();
            if (dimension != 2) {
                throw new MismatchedDimensionException(Errors.format(
                          ErrorKeys.MISMATCHED_DIMENSION_$3, "ptDst", dimension, 2));

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     * @return The derivative at the specified point as a 2&times;2 matrix.
     * @throws TransformException if the derivative can't be evaluated at the specified point.
     */
    @Override
    public Matrix derivative(final Point2D point) throws TransformException {
        return derivative(new GeneralDirectPosition(point));
    }

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     * @throws FactoryException If the math transform can't be created or used.
     */
    public Statistics getErrorStatistics() throws FactoryException {
        final MathTransform  mt     = getMathTransform();
        final Statistics     stats  = new Statistics();
        final DirectPosition buffer = new GeneralDirectPosition(getDimension());
        for (final Iterator <MappedPosition> it=getMappedPositions().iterator(); it.hasNext();) {
            final MappedPosition mp = (MappedPosition) it.next();
            /*
             * Transforms the source point using the math transform calculated by this class.
             * If the transform can't be applied, then we consider this failure as if it was

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                 * example because the affine transform swap axis or because there is an area of
                 * interest.
                 */
                // Clones the coordinate point in order to allow multi-thread
                // invocation.
                final GeneralDirectPosition coordinate = new GeneralDirectPosition(this.coordinate);
                final TiledImage tiled = new TiledImage(gridBounds.x, gridBounds.y,
                        gridBounds.width, gridBounds.height, 0, 0, sampleModel, colorModel);
                final Point2D.Double point2D = new Point2D.Double();
                final int numBands = tiled.getNumBands();
                final double[] samples = new double[numBands];

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                                final float[] real, final float[] imag)
        {
            int index = 0;
            float[] buffer = null;
            // Clones the coordinate point in order to allow multi-thread invocation.
            final GeneralDirectPosition coordinate = new GeneralDirectPosition(this.coordinate);
            coordinate.ordinates[1] = startY;
            for (int j=0; j<countY; j++) {
                coordinate.ordinates[0] = startX;
                for (int i=0; i<countX; i++) {
                    buffer = evaluate(coordinate, buffer);

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                                final double[] real, final double[] imag)
        {
            int index = 0;
            double[] buffer = null;
            // Clones the coordinate point in order to allow multi-thread invocation.
            final GeneralDirectPosition coordinate = new GeneralDirectPosition(this.coordinate);
            coordinate.ordinates[1] = startY;
            for (int j=0; j<countY; j++) {
                coordinate.ordinates[0] = startX;
                for (int i=0; i<countX; i++) {
                    buffer = evaluate(coordinate, buffer);

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    public MappedPosition(final int dimension) {
        if (dimension == 2) {
            source = new DirectPosition2D();
            target = new DirectPosition2D();
        } else {
            source = new GeneralDirectPosition(dimension);
            target = new GeneralDirectPosition(dimension);
        }
    }

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     */
    @Override
    public DirectPosition transform(final DirectPosition ptSrc, final DirectPosition ptDst) {
        if (ptSrc.getDimension() == dimension) {
            if (ptDst == null) {
                return new GeneralDirectPosition(ptSrc);
            }
            if (ptDst.getDimension() == dimension) {
                for (int i=0; i<dimension; i++) {
                    ptDst.setOrdinate(i, ptSrc.getOrdinate(i));
                }

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            return Math.abs(x1-x2) * getSemiMajorAxis(); // Points are on the equator.
        }
        // Other cases: no solution for this algorithm.
        final CoordinateFormat format = new CoordinateFormat();
        throw new ArithmeticException(Errors.format(ErrorKeys.NO_CONVERGENCE_$2,
                  format.format(new GeneralDirectPosition(Math.toDegrees(x1),Math.toDegrees(y1))),
                  format.format(new GeneralDirectPosition(Math.toDegrees(x2),Math.toDegrees(y2)))));
    }

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    public final DirectPosition transform(final DirectPosition ptSrc, DirectPosition ptDst)
            throws TransformException
    {
        checkDimension(ptSrc);
        if (ptDst==null) {
            ptDst = new GeneralDirectPosition(1);
        } else {
            checkDimension(ptDst);
        }
        ptDst.setOrdinate(0, transform(ptSrc.getOrdinate(0)));
        return ptDst;

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