org.locationtech.jts.geom.Geometry.union()方法的使用及代码示例

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中org.locationtech.jts.geom.Geometry.union()方法的一些代码示例，展示了Geometry.union()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Geometry.union()方法的具体详情如下：
包路径：org.locationtech.jts.geom.Geometry
类名称：Geometry
方法名：union

Geometry.union介绍

[英]Computes the union of all the elements of this geometry.

This method supports GeometryCollections (which the other overlay operations currently do not).

The result obeys the following contract:

  • Unioning a set of LineStrings has the effect of fully noding and dissolving the linework.
  • Unioning a set of Polygons always returns a Polygonal geometry (unlike #union(Geometry), which may return geometries of lower dimension if a topology collapse occurred).
    [中]计算此几何图形的所有元素的并集。
    此方法支持GeometryCollection（其他覆盖操作当前不支持）。
    结果符合以下合同：
    *合并一组线串具有完全点头和溶解线条的效果。
    *合并一组多边形始终会返回多边形几何体（与#union（geometry）不同，如果发生拓扑崩溃，则#union（geometry）可能会返回低维几何体）。

代码示例

代码示例来源：origin: geotools/geotools

  1. public static Geometry union(Geometry arg0, Geometry arg1) {
  2.   if (arg0 == null || arg1 == null) return null;
  3.   Geometry _this = arg0;
  4.   return _this.union(arg1);
  5. }

代码示例来源：origin: locationtech/spatial4j

  1. private static Geometry unionGeometryCollection(Geometry geom) {
  2.  if (geom instanceof GeometryCollection) {
  3.   return geom.union();
  4.  }
  5.  return geom;
  6. }

代码示例来源：origin: geotools/geotools

  1. public Geometry union() {
  2.   return geometry.union();
  3. }

代码示例来源：origin: geotools/geotools

  1. public Geometry union(Geometry other) {
  2.   return geometry.union(other);
  3. }

代码示例来源：origin: geotools/geotools

  1. /**
  2.  * Returns true if the geometry covers the entire world
  3.  *
  4.  * @param geometry
  5.  * @return
  6.  */
  7. private boolean isWorld(Literal geometry) {
  8.   if (geometry != null) {
  9.     Geometry g = geometry.evaluate(null, Geometry.class);
  10.     if (g != null) {
  11.       return JTS.toGeometry(WORLD).equalsTopo(g.union());
  12.     }
  13.   }
  14.   return false;
  15. }

代码示例来源：origin: geotools/geotools

  1. @DescribeProcess(
  2.   title = "Union",
  3.   description =
  4.       "Returns a geometry representing all points contained in any of the geometries in a geometry collection."
  5. )
  6. @DescribeResult(description = "Union of input geometries")
  7. public static Geometry union(
  8.     @DescribeParameter(name = "geom", description = "Input geometries (minimum 2)", min = 2)
  9.         Geometry... geoms) {
  10.   Geometry result = null;
  11.   for (Geometry g : geoms) {
  12.     if (result == null) {
  13.       result = g;
  14.     } else {
  15.       result = result.union(g);
  16.     }
  17.   }
  18.   return result;
  19. }

代码示例来源：origin: geotools/geotools

  1. @DescribeProcess(title = "Split Polygon", description = "Splits a polygon by a linestring")
  2. @DescribeResult(description = "The collection of split polygons")
  3. public static Geometry splitPolygon(
  4.     @DescribeParameter(name = "polygon", description = "Polygon to split") Geometry polygon,
  5.     @DescribeParameter(name = "line", description = "Linestring to split by")
  6.         LineString line) {
  7.   Geometry nodedLinework = polygon.getBoundary().union(line);
  8.   Geometry polys = polygonize(nodedLinework);
  9.   // Only keep polygons which are inside the input
  10.   List<Polygon> output = new ArrayList<Polygon>();
  11.   for (int i = 0; i < polys.getNumGeometries(); i++) {
  12.     Polygon candpoly = (Polygon) polys.getGeometryN(i);
  13.     // use interior point to test for inclusion in parent
  14.     if (polygon.contains(candpoly.getInteriorPoint())) {
  15.       output.add(candpoly);
  16.     }
  17.   }
  18.   return polygon.getFactory()
  19.       .createGeometryCollection(GeometryFactory.toGeometryArray(output));
  20. }

代码示例来源：origin: org.n52.sensorweb.sos/hibernate-common

  1. private Geometry mergeGeometries(Geometry geom, List<Object> list) {
  2.   for (Object extent : list) {
  3.     if (extent != null) {
  4.       if (geom == null) {
  5.         geom =  (Geometry) extent;
  6.       } else {
  7.         geom.union((Geometry) extent);
  8.       }
  9.     }
  10.   }
  11.   return geom;
  12. }

代码示例来源：origin: locationtech/jts

  1. private Geometry repeatedUnion(List geoms)
  2. {
  3.   Geometry union = null;
  4.   for (Iterator i = geoms.iterator(); i.hasNext(); ) {
  5.     Geometry g = (Geometry) i.next();
  6.     if (union == null)
  7.       union = g.copy();
  8.     else
  9.       union = union.union(g);
  10.   }
  11.   return union;
  12. }

代码示例来源：origin: locationtech/jts

  1. public static Geometry bufferByComponents(Geometry g, double distance)	
  2. {
  3.   return componentBuffers(g, distance).union();
  4. }

代码示例来源：origin: locationtech/jts

  1. (new FailureChecker() { void operation() {
  2.   b.union(a);
  3.  }  }).check(IllegalArgumentException.class);
  4. }

代码示例来源：origin: locationtech/jts

  1. (new FailureChecker() { void operation() {
  2.   a.union(b);
  3.  }  }).check(IllegalArgumentException.class);

代码示例来源：origin: org.opengeo/geodb

  1. @Override
  2. protected void add(Geometry geometry) {
  3.   if (result == null) {
  4.     result = geometry;
  5.   } else {
  6.     if (geometry != null) {
  7.       result = result.union(geometry.getEnvelope());
  8.     }
  9.   }
  10. }

代码示例来源：origin: locationtech/jts

  1. public static Geometry logoLines(Geometry g)
  2. {
  3.  return create_J(g)
  4.  .union(create_T(g))
  5.  .union(create_S(g));
  6. }

代码示例来源：origin: locationtech/jts

  1. public static Geometry unionUsingGeometryCollection(Geometry a, Geometry b)                 
  2. {   
  3.  Geometry gc = a.getFactory().createGeometryCollection(
  4.    new Geometry[] { a, b});
  5.  return gc.union(); 
  6. }

代码示例来源：origin: locationtech/jts

  1. /**
  2.  * Computes the set-theoretic union of two {@link Geometry}s, using enhanced precision.
  3.  * @param geom0 the first Geometry
  4.  * @param geom1 the second Geometry
  5.  * @return the Geometry representing the set-theoretic union of the input Geometries.
  6.  */
  7. public Geometry union(Geometry geom0, Geometry geom1)
  8. {
  9.  Geometry[] geom = removeCommonBits(geom0, geom1);
  10.  return computeResultPrecision(geom[0].union(geom[1]));
  11. }

代码示例来源：origin: locationtech/jts

  1. public static Geometry invokeGeometryOverlayMethod(int opCode, Geometry g0, Geometry g1)
  2. {
  3.  switch (opCode) {
  4.   case OverlayOp.INTERSECTION: return g0.intersection(g1);
  5.   case OverlayOp.UNION: return g0.union(g1);
  6.   case OverlayOp.DIFFERENCE: return g0.difference(g1);
  7.   case OverlayOp.SYMDIFFERENCE: return g0.symDifference(g1);
  8.  }
  9.  throw new IllegalArgumentException("Unknown overlay op code");
  10. }

代码示例来源：origin: locationtech/jts

  1. public double measure(Geometry g1, Geometry g2)
  2. {        
  3.   double areaInt = g1.intersection(g2).getArea();
  4.   double areaUnion = g1.union(g2).getArea();
  5.   return areaInt / areaUnion;
  6. }

代码示例来源：origin: locationtech/jts

  1. public void testNoding() throws Exception {
  2.  Geometry a = reader.read("LINESTRING(0 0, 100 100)");
  3.  Geometry b = reader.read("LINESTRING(0 100, 100 0)");
  4.  List lineStrings = Arrays.asList(new Object[] {a, b});
  5.  Geometry nodedLineStrings = (LineString) lineStrings.get(0);
  6.  for (int i = 1; i < lineStrings.size(); i++) {
  7.   nodedLineStrings = nodedLineStrings.union((LineString)lineStrings.get(i));
  8.  }
  9.  assertEquals("MULTILINESTRING ((0 0, 50 50), (50 50, 100 100), (0 100, 50 50), (50 50, 100 0))", nodedLineStrings.toString());
  10. }

代码示例来源：origin: locationtech/jts

  1. private Geometry dissolveLines(Geometry lines) {
  2.  Geometry dissolved = lines.union();
  3.  LineMerger merger = new LineMerger();
  4.  merger.add(dissolved);
  5.  Collection mergedColl = merger.getMergedLineStrings();
  6.  Geometry merged = lines.getFactory().buildGeometry(mergedColl);
  7.  return merged;
  8. }

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