Examples of com.spatial4j.core.shape.Shape

com.spatial4j.core.shape.Shape
The base interface defining a geometric shape. Shape instances should be instantiated via one of the create* methods on a {@link SpatialContext} orby reading WKT which calls those methods; they should not be created directly.
Shapes are generally immutable and thread-safe. If a particular shape has a reset(...) method then its use means the shape is actually mutable. Mutating shape state is considered expert and should be done with care.

  public ConstantScoreQuery makeQuery(SpatialArgs args) {
    if(! SpatialOperation.is( args.getOperation(),
        SpatialOperation.Intersects,
        SpatialOperation.IsWithin ))
      throw new UnsupportedSpatialOperation(args.getOperation());
    Shape shape = args.getShape();
    if (shape instanceof Rectangle) {
      Rectangle bbox = (Rectangle) shape;
      return new ConstantScoreQuery(makeWithin(bbox));
    } else if (shape instanceof Circle) {
      Circle circle = (Circle)shape;
      Rectangle bbox = circle.getBoundingBox();
      ValueSourceFilter vsf = new ValueSourceFilter(
          new QueryWrapperFilter(makeWithin(bbox)),
          makeDistanceValueSource(circle.getCenter()),
          0,
          circle.getRadius() );
      return new ConstantScoreQuery(vsf);
    } else {
      throw new UnsupportedOperationException("Only Rectangles and Circles are currently supported, " +
          "found [" + shape.getClass() + "]");//TODO
    }
  }

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  }


  //TODO this is basically old code that hasn't been verified well and should probably be removed
  public Query makeQueryDistanceScore(SpatialArgs args) {
    // For starters, just limit the bbox
    Shape shape = args.getShape();
    if (!(shape instanceof Rectangle || shape instanceof Circle)) {
      throw new UnsupportedOperationException("Only Rectangles and Circles are currently supported, " +
          "found [" + shape.getClass() + "]");//TODO
    }


    Rectangle bbox = shape.getBoundingBox();


    if (bbox.getCrossesDateLine()) {
      throw new UnsupportedOperationException( "Crossing dateline not yet supported" );
    }


    ValueSource valueSource = null;


    Query spatial = null;
    SpatialOperation op = args.getOperation();


    if( SpatialOperation.is( op,
        SpatialOperation.BBoxWithin,
        SpatialOperation.BBoxIntersects ) ) {
        spatial = makeWithin(bbox);
    }
    else if( SpatialOperation.is( op,
      SpatialOperation.Intersects,
      SpatialOperation.IsWithin ) ) {
      spatial = makeWithin(bbox);
      if( args.getShape() instanceof Circle) {
        Circle circle = (Circle)args.getShape();


        // Make the ValueSource
        valueSource = makeDistanceValueSource(shape.getCenter());


        ValueSourceFilter vsf = new ValueSourceFilter(
            new QueryWrapperFilter( spatial ), valueSource, 0, circle.getRadius() );


        spatial = new FilteredQuery( new MatchAllDocsQuery(), vsf );
      }
    }
    else if( op == SpatialOperation.IsDisjointTo ) {
      spatial =  makeDisjoint(bbox);
    }


    if( spatial == null ) {
      throw new UnsupportedSpatialOperation(args.getOperation());
    }


    if( valueSource != null ) {
      valueSource = new CachingDoubleValueSource(valueSource);
    }
    else {
      valueSource = makeDistanceValueSource(shape.getCenter());
    }
    Query spatialRankingQuery = new FunctionQuery(valueSource);
    BooleanQuery bq = new BooleanQuery();
    bq.add(spatial,BooleanClause.Occur.MUST);
    bq.add(spatialRankingQuery,BooleanClause.Occur.MUST);

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    ctx = factory.newSpatialContext();
  }


  @Test
  public void wktGeoPt() throws IOException {
    Shape s = ctx.readShape("Point(-160 30)");
    assertEquals(ctx.makePoint(-160,30),s);
  }

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    // JtsSpatialContext will give the wrong result for a rectangle crossing the dateline.


    // In these two tests, we give the same set of points, one that does not cross the dateline, and the 2nd does. The
    // order is counter-clockwise in both cases as it should be.


    Shape sNoDL = ctx.readShape("Polygon((-170 30, -170 15,  160 15,  160 30, -170 30))");
    Rectangle expectedNoDL = ctx.makeRectangle(-170, 160, 15, 30);
    assertTrue(!expectedNoDL.getCrossesDateLine());
    assertEquals(expectedNoDL,sNoDL);


    Shape sYesDL = ctx.readShape("Polygon(( 160 30,  160 15, -170 15, -170 30,  160 30))");
    Rectangle expectedYesDL = ctx.makeRectangle(160, -170, 15, 30);
    assertTrue(expectedYesDL.getCrossesDateLine());
    assertEquals(expectedYesDL,sYesDL);


  }

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    this.ctx = (JtsSpatialContext) super.ctx;
  }


  @Test
  public void testParsePolygon() throws ParseException {
    Shape polygonNoHoles = new PolygonBuilder(ctx)
        .point(100, 0)
        .point(101, 0)
        .point(101, 1)
        .point(100, 2)
        .point(100, 0)
        .build();
    String polygonNoHolesSTR = "POLYGON ((100 0, 101 0, 101 1, 100 2, 100 0))";
    assertParses(polygonNoHolesSTR, polygonNoHoles);
    assertParses("POLYGON((100 0,101 0,101 1,100 2,100 0))", polygonNoHoles);


    assertParses("GEOMETRYCOLLECTION ( "+polygonNoHolesSTR+")",
        ctx.makeCollection(Arrays.asList(polygonNoHoles)));


    Shape polygonWithHoles = new PolygonBuilder(ctx)
        .point(100, 0)
        .point(101, 0)
        .point(101, 1)
        .point(100, 1)
        .point(100, 0)

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        ctx.makeRectangle(-170, 160, 0, 10));
  }


  @Test
  public void testParseMultiPolygon() throws ParseException {
    Shape p1 = new PolygonBuilder(ctx)
        .point(100, 0)
        .point(101, 0)//101
        .point(101, 2)//101
        .point(100, 1)
        .point(100, 0)
        .build();
    Shape p2 = new PolygonBuilder(ctx)
        .point(100, 0)
        .point(102, 0)//102
        .point(102, 2)//102
        .point(100, 1)
        .point(100, 0)
        .build();
    Shape s = ctx.makeCollection(
        Arrays.asList(p1, p2)
    );
    assertParses("MULTIPOLYGON(" +
        "((100 0, 101 0, 101 2, 100 1, 100 0))" + ',' +
        "((100 0, 102 0, 102 2, 100 1, 100 0))" +

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  }


  @Test
  public void testLineStringDateline() throws ParseException {
    //works because we use JTS (JtsGeometry); BufferedLineString doesn't yet do DL wrap.
    Shape s = ctx.readShapeFromWkt("LINESTRING(160 10, -170 15)");
    assertEquals(30, s.getBoundingBox().getWidth(), 0.0 );
  }

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    String wkt = "POLYGON((0 0, 10 0, 10 20, 5 -5, 0 20, 0 0))";//Topology self-intersect


    JtsSpatialContextFactory factory = new JtsSpatialContextFactory();
    factory.validationRule = JtsWktShapeParser.ValidationRule.repairBuffer0;
    JtsSpatialContext ctx = factory.newSpatialContext();
    Shape buffer0 = ctx.readShapeFromWkt(wkt);
    assertTrue(buffer0.getArea(ctx) > 0);


    factory = new JtsSpatialContextFactory();
    factory.validationRule = JtsWktShapeParser.ValidationRule.repairConvexHull;
    ctx = factory.newSpatialContext();
    Shape cvxHull = ctx.readShapeFromWkt(wkt);
    assertTrue(cvxHull.getArea(ctx) > 0);


    assertEquals(SpatialRelation.CONTAINS, cvxHull.relate(buffer0));


    factory = new JtsSpatialContextFactory();
    factory.validationRule = JtsWktShapeParser.ValidationRule.none;
    ctx = factory.newSpatialContext();
    ctx.readShapeFromWkt(wkt);//doesn't throw

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      return new State(wkt);
    }


    @Override
    public Shape parseShapeByType(State state, String shapeType) throws ParseException {
      Shape result = super.parseShapeByType(state, shapeType);
      if (result == null && shapeType.contains("custom")) {
        state.nextExpect('(');
        state.nextExpect(')');
        return new CustomShape(shapeType, ctx);
      }

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    assertFails("POINT ZM EMPTY 1");
  }


  @Test
  public void testParseMultiPoint() throws ParseException {
    Shape s1 = ctx.makeCollection(Collections.singletonList(ctx.makePoint(10, 40)));
    assertParses("MULTIPOINT (10 40)", s1);


    Shape s4 = ctx.makeCollection(Arrays.asList(
        ctx.makePoint(10, 40), ctx.makePoint(40, 30),
        ctx.makePoint(20, 20), ctx.makePoint(30, 10)));
    assertParses("MULTIPOINT ((10 40), (40 30), (20 20), (30 10))", s4);
    assertParses("MULTIPOINT (10 40, 40 30, 20 20, 30 10)", s4);

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