Examples of com.vividsolutions.jts.geom.PrecisionModel

com.vividsolutions.jts.geom.PrecisionModel
Specifies the precision model of the {@link Coordinate}s in a {@link Geometry}. In other words, specifies the grid of allowable points for all Geometrys.
The {@link makePrecise} method allows rounding a coordinate toa "precise" value; that is, one whose precision is known exactly.
Coordinates are assumed to be precise in geometries. That is, the coordinates are assumed to be rounded to the precision model given for the geometry. JTS input routines automatically round coordinates to the precision model before creating Geometries. All internal operations assume that coordinates are rounded to the precision model. Constructive methods (such as boolean operations) always round computed coordinates to the appropriate precision model.
Currently three types of precision model are supported:
- FLOATING - represents full double precision floating point. This is the default precision model used in JTS
- FLOATING_SINGLE - represents single precision floating point.
- FIXED - represents a model with a fixed number of decimal places. A Fixed Precision Model is specified by a scale factor. The scale factor specifies the size of the grid which numbers are rounded to. Input coordinates are mapped to fixed coordinates according to the following equations:
  - jtsPt.x = round( (inputPt.x * scale ) / scale
  - jtsPt.y = round( (inputPt.y * scale ) / scale
For example, to specify 3 decimal places of precision, use a scale factor of 1000. To specify -3 decimal places of precision (i.e. rounding to the nearest 1000), use a scale factor of 0.001.
Coordinates are represented internally as Java double-precision values. Since Java uses the IEEE-394 floating point standard, this provides 53 bits of precision. (Thus the maximum precisely representable integer is 9,007,199,254,740,992).
JTS methods currently do not handle inputs with different precision models. @version 1.7

            Coordinate firstArray[] = new Coordinate[5];
            for (int j = 0; j < 4; j++) {
                firstArray[j] = new Coordinate(j + numFeatures, j + numFeatures);
            }
            firstArray[4] = new Coordinate(0 + numFeatures, 0 + numFeatures);
            LinearRing shell = new LinearRing(firstArray, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            firstArrayGeometry[numFeatures] = gf.createPolygon(shell, null);
            features.add(b.buildFeature(numFeatures + ""));


        }
        for (int numFeatures = 0; numFeatures < 5; numFeatures++) {
            Coordinate array[] = new Coordinate[5];
            for (int j = 0; j < 4; j++) {
                array[j] = new Coordinate(j + numFeatures + 50, j + numFeatures + 50);
            }
            array[4] = new Coordinate(0 + numFeatures + 50, 0 + numFeatures + 50);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            secondArrayGeometry[numFeatures] = gf.createPolygon(shell, null);
            secondFeatures.add(b.buildFeature(numFeatures + ""));

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            for (int i = 0 + numFeatures; i < 3 + numFeatures; i++) {
                array[j] = new Coordinate(i, i);
                j++;
            }
            array[3] = new Coordinate(numFeatures, numFeatures);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            features.add(b.buildFeature(numFeatures + ""));
        }
        Double distance = new Double(500);
        BufferFeatureCollection process = new BufferFeatureCollection();
        SimpleFeatureCollection output = process.execute(features, distance, null);
        assertEquals(5, output.size());
        SimpleFeatureIterator iterator = output.features();
        for (int numFeatures = 0; numFeatures < 5; numFeatures++) {
            Coordinate[] array = new Coordinate[4];
            int j = 0;
            for (int i = 0 + numFeatures; i < 3 + numFeatures; i++) {
                array[j] = new Coordinate(i, i);
                j++;
            }
            array[3] = new Coordinate(numFeatures, numFeatures);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            Geometry expected = gf.createPolygon(shell, null).buffer(distance);


            SimpleFeature sf = iterator.next();
            assertTrue(expected.equals((Geometry) sf.getDefaultGeometry()));
        }

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            for (int i = 0 + numFeatures; i < 3 + numFeatures; i++) {
                array[j] = new Coordinate(i, i);
                j++;
            }
            array[3] = new Coordinate(numFeatures, numFeatures);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            b.add(numFeatures + 1);
            features.add(b.buildFeature(numFeatures + ""));
        }


        BufferFeatureCollection process = new BufferFeatureCollection();
        SimpleFeatureCollection output = process.execute(features, null, "buffer");
        assertEquals(5, output.size());
        SimpleFeatureIterator iterator = output.features();
        ReferencedEnvelope expectedBounds = new ReferencedEnvelope(output.getSchema().getCoordinateReferenceSystem());
        for (int numFeatures = 0; numFeatures < 5; numFeatures++) {
            Coordinate[] array = new Coordinate[4];
            int j = 0;
            for (int i = 0 + numFeatures; i < 3 + numFeatures; i++) {
                array[j] = new Coordinate(i, i);
                j++;
            }
            array[3] = new Coordinate(numFeatures, numFeatures);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            Geometry expected = gf.createPolygon(shell, null).buffer(numFeatures + 1);
            expectedBounds.expandToInclude(expected.getEnvelopeInternal());


            SimpleFeature sf = iterator.next();
            assertTrue(expected.equals((Geometry) sf.getDefaultGeometry()));

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            array[0] = new Coordinate(0, 0);
            array[1] = new Coordinate(1, 0);
            array[2] = new Coordinate(1, 1);
            array[3] = new Coordinate(0, 1);
            array[4] = new Coordinate(0, 0);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            firstArrayGeometry[0] = gf.createPolygon(shell, null);
            features.add(b.buildFeature(numFeatures + ""));
        }
        for (int numFeatures = 0; numFeatures < 1; numFeatures++) {
            Coordinate array[] = new Coordinate[5];
            Coordinate centre = ((Polygon) features.features().next().getDefaultGeometry())
                    .getCentroid().getCoordinate();
            array[0] = new Coordinate(centre.x, centre.y);
            array[1] = new Coordinate(centre.x + 1, centre.y);
            array[2] = new Coordinate(centre.x + 1, centre.y + 1);
            array[3] = new Coordinate(centre.x, centre.y + 1);
            array[4] = new Coordinate(centre.x, centre.y);
            LinearRing shell = new LinearRing(array, new PrecisionModel(), 0);
            b.add(gf.createPolygon(shell, null));
            b.add(0);
            secondArrayGeometry[0] = gf.createPolygon(shell, null);
            secondFeatures.add(b.buildFeature(numFeatures + ""));
        }

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        coords[1] = new Coordinate(3, 4);
        coords[2] = new Coordinate(5, 6);


        // Test Equals
        PropertyName att = fac.property("testGeometry");
        GeometryFactory gf = new GeometryFactory(new PrecisionModel());
        Literal geom = fac.literal(gf.createLineString(coords));
        
        Equals filter = fac.equal(att, geom);
        assertAttributeName(filter, "testGeometry");

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        coords2[1] = new Coordinate(15, 10);
        coords2[2] = new Coordinate(15, 15);
        coords2[3] = new Coordinate(10, 15);
        coords2[4] = new Coordinate(10, 10);


        GeometryFactory gf = new GeometryFactory(new PrecisionModel());
        Literal right = fac.literal(gf.createPolygon(
                    gf.createLinearRing(coords2), null));
        DWithin filter = fac.dwithin(fac.property("testGeometry"), right, 10, "m");


        assertAttributeName(filter, "testGeometry");

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    public void testValidConstruction() throws Exception {
        Literal a = new LiteralExpressionImpl(new Double(10));
        Literal b = new LiteralExpressionImpl("Label");
        Literal c = new LiteralExpressionImpl(new Integer(10));
        GeometryFactory gf = new GeometryFactory(new PrecisionModel());
        Literal d = new LiteralExpressionImpl(gf.createGeometryCollection(null));
    }

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        // create a feature collection ----------------------------------------
        final MemoryFeatureCollection fc = new MemoryFeatureCollection(schema);


        // populate the collection --------------------------------------------
        final PrecisionModel pm = new PrecisionModel(PrecisionModel.FLOATING);
        final GeometryFactory jtsFactory = new GeometryFactory(pm, SRID);


        // create 1st point
        final Point g1 = jtsFactory.createPoint(new Coordinate(X_1, Y_1));
        fc.add(SimpleFeatureBuilder.build(schema, new Object[] { new Integer(1), g1, LABEL_1 }, ID_1));

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    }
    
    @Test
    public void testGeometries_Any() {
        Filter filter;
        GeometryFactory gf = new GeometryFactory(new PrecisionModel());
       
        Coordinate[] coords1 = {
                new Coordinate(0, 0),
                new Coordinate(6, 0),
                new Coordinate(6, 7),

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    }
    
    @Test
    public void testGeometries_One() {
        Filter filter;
        GeometryFactory gf = new GeometryFactory(new PrecisionModel());
       
        Coordinate[] coords1 = {
                new Coordinate(0, 0),
                new Coordinate(6, 0),
                new Coordinate(6, 7),

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