Examples of 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
org.geotools.geometry.iso.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 to a "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 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
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. @source $URL$ @version 1.7.2

Examples of com.vividsolutions.jts.geom.PrecisionModel

    assertEquals("[12,34.23,12,54.56,7,8,12,34.23]", shell.get("coordinates").toString());
  }


  public void testMultiPolygon() throws MarshallException {
    GeometrySerializer ser = new GeometrySerializer();
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(100.0), 31300);
    CoordinateArraySequence coords = new CoordinateArraySequence(new Coordinate[] {
        new Coordinate(12.0, 34.23), new Coordinate(12.000, 54.555), new Coordinate(7, 8),
        new Coordinate(12.0, 34.23)});
    LinearRing ring = new LinearRing(coords, factory);
    Polygon p = new Polygon(ring, new LinearRing[] {}, factory);

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Examples of com.vividsolutions.jts.geom.PrecisionModel

    assertEquals("[12,34.23,12,54.56,7,8,12,34.23]", shell.get("coordinates").toString());
  }


  public void testMultiLineString() throws MarshallException {
    GeometrySerializer ser = new GeometrySerializer();
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(100.0), 31300);
    CoordinateArraySequence coords = new CoordinateArraySequence(new Coordinate[] {
        new Coordinate(12.0, 34.23), new Coordinate(12.000, 54.555), new Coordinate(-0.01, -0.0)});
    LineString l = new LineString(coords, factory);
    MultiLineString m = new MultiLineString(new LineString[] {l}, factory);
    JSONObject jo = (JSONObject) ser.marshall(null, m);

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Examples of com.vividsolutions.jts.geom.PrecisionModel

    authentications.add(auth1);
    securityContext.setAuthentications("token", authentications);
    Assert.assertTrue(securityContext.isLayerVisible(LAYER_ID));
    Geometry geometry = securityContext.getVisibleArea(LAYER_ID);
    Assert.assertNotNull(geometry);
    PrecisionModel precisionModel  = new PrecisionModel(PrecisionModel.FLOATING);
    GeometryFactory geometryFactory = new GeometryFactory(precisionModel, LAYER_SRID);
    Coordinate coordinate = new Coordinate();


    coordinate.x = coordinate.y = -86;
    Assert.assertFalse(geometry.contains(geometryFactory.createPoint(coordinate)));

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Examples of com.vividsolutions.jts.geom.PrecisionModel

    authentications.add(auth2);
    securityContext.setAuthentications("token", authentications);


    Geometry geometry = securityContext.getVisibleArea(LAYER_ID);
    Assert.assertNotNull(geometry);
    PrecisionModel precisionModel  = new PrecisionModel(PrecisionModel.FLOATING);
    GeometryFactory geometryFactory = new GeometryFactory(precisionModel, LAYER_SRID);
    Coordinate coordinate = new Coordinate();
    coordinate.x = coordinate.y = 0.5;
    Assert.assertFalse(geometry.contains(geometryFactory.createPoint(coordinate)));
    coordinate.x = coordinate.y = 1.5;

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Examples of com.vividsolutions.jts.geom.PrecisionModel

    authentications.add(auth2);
    securityContext.setAuthentications("token", authentications);


    Geometry geometry = securityContext.getVisibleArea(LAYER_ID);
    Assert.assertNotNull(geometry);
    PrecisionModel precisionModel  = new PrecisionModel(PrecisionModel.FLOATING);
    GeometryFactory geometryFactory = new GeometryFactory(precisionModel, LAYER_SRID);
    Coordinate coordinate = new Coordinate();
    coordinate.x = coordinate.y = 0.5;
    Assert.assertFalse(geometry.contains(geometryFactory.createPoint(coordinate)));
    coordinate.x = coordinate.y = 1.5;

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Examples of com.vividsolutions.jts.geom.PrecisionModel

         envelope = new Envelope(1, 3, 1, 3);
      } else {
        partly = true;
         envelope = new Envelope(2, 4, 2, 4);
      }
      PrecisionModel precisionModel  = new PrecisionModel(PrecisionModel.FLOATING);
      GeometryFactory geometryFactory = new GeometryFactory(precisionModel, LAYER_SRID);
      geometry = geometryFactory.toGeometry(envelope);
    }

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Examples of com.vividsolutions.jts.geom.PrecisionModel

  protected Geometry getAuthorizedArea(String layerId) {
    if (null == biggestGeometry) {
      // build Geometry which covers biggest possible area
      Envelope maxBounds = new Envelope(-Double.MAX_VALUE, Double.MAX_VALUE,
          -Double.MAX_VALUE, Double.MAX_VALUE);
      PrecisionModel precisionModel = new PrecisionModel(PrecisionModel.FLOATING);
      GeometryFactory geometryFactory = new GeometryFactory(precisionModel, 0);
      biggestGeometry = geometryFactory.toGeometry(maxBounds);
    }
    return biggestGeometry;
  }

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Examples of com.vividsolutions.jts.geom.PrecisionModel

      if (null == layer) {
        return null;
      }
      String area = layer.getVisibleArea();
      try {
        WKTReader wktReader = new WKTReader(new GeometryFactory(new PrecisionModel(), 0));
        return wktReader.read(area);
      } catch (ParseException pe) {
        throw new IllegalStateException("Could not parse geometry " + area, pe);
      }
    }

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Examples of com.vividsolutions.jts.geom.PrecisionModel

      if (null == layer) {
        return null;
      }
      String area = layer.getUpdateAuthorizedArea();
      try {
        WKTReader wktReader = new WKTReader(new GeometryFactory(new PrecisionModel(), 0));
        return wktReader.read(area);
      } catch (ParseException pe) {
        throw new IllegalStateException("Could not parse geometry " + area, pe);
      }
    }

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Examples of com.vividsolutions.jts.geom.PrecisionModel

      if (null == layer) {
        return null;
      }
      String area = layer.getCreateAuthorizedArea();
      try {
        WKTReader wktReader = new WKTReader(new GeometryFactory(new PrecisionModel(), 0));
        return wktReader.read(area);
      } catch (ParseException pe) {
        throw new IllegalStateException("Could not parse geometry " + area, pe);
      }
    }

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