Examples of DirectPosition2D

org.apache.sis.geometry.DirectPosition2D
Holds the coordinates for a two-dimensional position on top of {@link Point2D}. This implementation is provided for inter-operability between Java2D and GeoAPI.
This class inherits {@linkplain #x x} and {@linkplain #y y} fields.But despite their names, they don't need to be oriented toward {@linkplain AxisDirection#EAST East} and{@linkplain AxisDirection#NORTH North} respectively. The (x,y) axis can have anydirection and should be understood as ordinate 0 and ordinate 1 values instead. This is not specific to this implementation; in Java2D too, the visual axis orientation depend on the {@linkplain java.awt.Graphics2D#getTransform() affine transform in the graphics context}.
{@note The rational for avoiding axis orientation restriction is that other DirectPositionimplementations do not have such restriction, and it would be hard to generalize. For example there is no clear "x" or "y" classification for North-East direction.}{@section Caution when used in collections}Do not mix instances of this class with ordinary {@link Point2D} instancesin a {@code HashSet} or as {@code HashMap} keys.It is not possible to meet both {@link Point2D#hashCode()} and {@link DirectPosition#hashCode()}contracts, and this class chooses to implements the later. Consequently, the {@link #hashCode()}method of this class is inconsistent with {@link Point2D#equals(Object)} but is consistent with{@link DirectPosition#equals(Object)}.
In other words, it is safe to add instances of {@code DirectPosition2D} in a{@code HashSet}, but it is unsafe to add them in a {@code HashSet}. Collections that do not rely on hash codes, like {@code ArrayList}, are safe in all cases.
@author Martin Desruisseaux (IRD, Geomatys) @since 0.3 (derived from geotk-2.0) @version 0.3 @module @see DirectPosition1D @see GeneralDirectPosition @see Point2D
org.geotools.geometry.DirectPosition2D
Holds the coordinates for a two-dimensional position within some coordinate reference system.
Note 1:
This class inherits {@linkplain #x x} and {@linkplain #y y} fields. But despite their names,they don't need to be oriented toward {@linkplain org.opengis.referencing.cs.AxisDirection#EAST East} and {@linkplain org.opengis.referencing.cs.AxisDirection#NORTH North}. The (x,y) axis can have any orientation and should be understood as "ordinate 0" and "ordinate 1" values instead. This is not specific to this implementation; in Java2D too, the visual axis orientation depend on the {@linkplain java.awt.Graphics2D#getTransform affine transform in the graphics context}.
The rational for avoiding axis orientation restriction is that other {@link DirectPosition}implementation do not have such restriction, and it would be hard to generalize (what to do with {@linkplain org.opengis.referencing.cs.AxisDirection#NORTH_EAST North-East} direction?).

Note 2:
Do not mix instances of this class with ordinary {@link Point2D} instances in a{@link java.util.HashSet} or as {@link java.util.HashMap} keys. It is not possible tomeet both {@link Point2D#hashCode} and {@link DirectPosition#hashCode} contract, and this classchoose to implements the later. Concequently, {@link #hashCode} is inconsistent with{@link Point2D#equals} (but is consistent with {@link DirectPosition#equals}).
In other words, it is safe to add instances of {@code DirectPosition2D} in a{@code HashSet}, but it is unsafe to add them in a {@code HashSet}. Collections that do not rely on {@link Object#hashCode}, like {@link java.util.ArrayList}, are safe in all cases.
@since 2.0 @source $URL$ @version $Id$ @author Martin Desruisseaux (IRD) @see DirectPosition1D @see GeneralDirectPosition @see java.awt.geom.Point2D

Examples of org.geotools.geometry.DirectPosition2D

        params.parameter("false_northing")  .setValue( 900000.0  );
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(120.0, -3.0),
                    new DirectPosition2D(5009726.58, 569150.82), transform);


        //spherical test (Snyder p. 266)
        params.parameter("semi_major")      .setValue(   1.0);
        params.parameter("semi_minor")      .setValue(   1.0);
        params.parameter("central_meridian").setValue(-180.0);
        params.parameter("scale_factor")    .setValue(   1.0);
        params.parameter("false_easting")   .setValue(   0.0);
        params.parameter("false_northing")  .setValue(   0.0);
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(-75.0, 35.0),
                    new DirectPosition2D(1.8325957, 0.6528366), transform);


        //spherical test 2 (original units for target were feet)
        params.parameter("semi_major")      .setValue(6370997.0);
        params.parameter("semi_minor")      .setValue(6370997.0);
        params.parameter("central_meridian").setValue(      0.0);
        params.parameter("scale_factor")    .setValue(      1.0);
        params.parameter("false_easting")   .setValue(      0.0);
        params.parameter("false_northing")  .setValue(      0.0);
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(-123.1, 49.2166666666),
                    new DirectPosition2D(-13688089.02443480, 6304639.84599441), transform);


        //ellipsoidal with latitude of origin not zero, (simone)
        params.parameter("semi_major")        .setValue(6378137.0);
        params.parameter("semi_minor")        .setValue(6356752.314245);
        params.parameter("latitude_of_origin").setValue(     38.0);
        params.parameter("central_meridian")  .setValue(     3.03);
        params.parameter("scale_factor")      .setValue(      1.0);
        params.parameter("false_easting")     .setValue(      0.0);
        params.parameter("false_northing")    .setValue(      0.0);
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(4.999999999999999,26.996561536844165),
                    new DirectPosition2D(173029.94823812644, 2448819.342941506), transform);




        ///////////////////////////////////////
        // Mercator_2SP tests                //
        ///////////////////////////////////////
        if (VERBOSE) {
            printParameters("Mercator_2SP");
        }
        //epsg p25. Note FE and FN are wrong in guide 7. Correct in epsg database v6.3.
        params = mtFactory.getDefaultParameters("Mercator_2SP");
        params.parameter("semi_major")         .setValue(6378245.000);
        params.parameter("semi_minor")         .setValue(6356863.019);
        params.parameter("central_meridian")   .setValue(     51.0);
        params.parameter("standard_parallel_1").setValue(     42.0);
        params.parameter("false_easting")      .setValue(      0.0);
        params.parameter("false_northing")     .setValue(      0.0);
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(53.0, 53.0),
                    new DirectPosition2D(165704.29, 5171848.07), transform);


        //a spherical case (me)
        params = mtFactory.getDefaultParameters("Mercator_2SP");
        params.parameter("semi_major")         .setValue( 6370997.0);
        params.parameter("semi_minor")         .setValue( 6370997.0);
        params.parameter("central_meridian")   .setValue(     180.0);
        params.parameter("standard_parallel_1").setValue(      60.0);
        params.parameter("false_easting")      .setValue( -500000.0);
        params.parameter("false_northing")     .setValue(-1000000.0);
        transform = mtFactory.createParameterizedTransform(params);
        if (VERBOSE) {
            System.out.println(transform);
        }
        doTransform(new DirectPosition2D(-123.1, 49.2166666666),
                    new DirectPosition2D(2663494.1734, 2152319.9230), transform);


    }

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