Java GeometryEngine.buffer方法代码示例

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private com.esri.ges.spatial.Geometry constructBuffer(double x, double y, double radius, String units, int wkidin, int wkidbuffer, int wkidout) throws GeometryException
{
	Point center = new Point();
	center.setX(x);
	center.setY(y);
	SpatialReference srIn = SpatialReference.create(wkidin);
	SpatialReference srBuffer = SpatialReference.create(wkidbuffer);
	SpatialReference srOut = SpatialReference.create(wkidout);
	UnitConverter uc = new UnitConverter();
	String c_name = uc.findConnonicalName(units);
	int unitout = uc.findWkid(c_name);
	Unit  u = new LinearUnit(unitout);
	Point centerProj = (Point) GeometryEngine.project(center, srIn, srBuffer);
	Geometry buffer = GeometryEngine.buffer(centerProj, srBuffer, radius, u);
	Geometry bufferout = GeometryEngine.project(buffer, srBuffer, srOut);
	String json = GeometryEngine.geometryToJson(srOut, bufferout);
	return spatial.fromJson(json);
	
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private Geometry constructBuffer(double x, double y,
		double radius, String units, int wkidin, int wkidbuffer, int wkidout)
		 {
	Point center = new Point();
	center.setX(x);
	center.setY(y);
	SpatialReference srIn = SpatialReference.create(wkidin);
	SpatialReference srBuffer = SpatialReference.create(wkidbuffer);
	SpatialReference srOut = SpatialReference.create(wkidout);
	UnitConverter uc = new UnitConverter();
	String c_name = uc.findConnonicalName(units);
	int unitout = uc.findWkid(c_name);
	Unit u = LinearUnit.create(unitout);
	Point centerProj = (Point) GeometryEngine.project(center, srIn,
			srBuffer);
	Geometry buffer = GeometryEngine
			.buffer(centerProj, srBuffer, radius, u);
	Geometry bufferout = GeometryEngine.project(buffer, srBuffer, srOut);
	//String json = GeometryEngine.geometryToJson(srOut, bufferout);
	return bufferout;

}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
/**
 * Create a buffer for a line.
 * @param lineJsonString A JSON string defining the line.
 * @param distance The buffer distance.
 * @return A JSON string with the buffer polygon.
 */
public static String bufferLine(String lineJsonString, double distance){
	String geoJson = null;
	try{
		Polyline polyline = new Polyline();
		JSONObject lineJson = new JSONObject(lineJsonString);
		JSONArray paths = lineJson.getJSONArray("paths");
		JSONArray line = paths.getJSONArray(0);
		for(int k = 0; k < line.length(); k++){
			JSONArray point = line.getJSONArray(k);
			double x = point.getDouble(0);
			double y = point.getDouble(1);
			if(k == 0){
				polyline.startPath(x, y);
			}else{
				polyline.lineTo(x, y);
			}
		}
		SpatialReference srsWGS84 = SpatialReference.create(SpatialReference.WKID_WGS84);
		SpatialReference srsWebMercator = SpatialReference.create(SpatialReference.WKID_WGS84_WEB_MERCATOR);
		Geometry mercatorPolyline = GeometryEngine.project(polyline, srsWGS84, srsWebMercator);
		Polygon mercatorPolygon = GeometryEngine.buffer(mercatorPolyline, srsWebMercator, distance, srsWebMercator.getUnit());
		Polygon polygon = (Polygon) GeometryEngine.project(mercatorPolygon, srsWebMercator, srsWGS84);
		geoJson = GeometryEngine.geometryToJson(srsWGS84, polygon);			
	}catch(Exception e){
		log.error("Error creating line buffer: "+e.getMessage());
	}
	return geoJson;
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private void highlightGeometry(Point point) {
  if (point == null) {
    return;
  }

  graphicsLayer.removeAll();
  graphicsLayer.addGraphic(
    new Graphic(point, new SimpleMarkerSymbol(Color.CYAN, 20, SimpleMarkerSymbol.Style.CIRCLE)));
  
  // -----------------------------------------------------------------------------------------
  // Zoom to the highlighted graphic
  // -----------------------------------------------------------------------------------------
  Geometry geometryForZoom = GeometryEngine.buffer(
    point, 
    map.getSpatialReference(), 
    map.getFullExtent().getWidth() * 0.10, 
    map.getSpatialReference().getUnit());
  map.zoomTo(geometryForZoom);
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private com.esri.ges.spatial.Geometry constructBuffer(Geometry geo, double radius, Unit u) throws GeometryException, JsonParseException, IOException
{
	
	com.esri.core.geometry.Geometry buffer = GeometryEngine.buffer(inGeometry, srBuffer, radius, u);
	com.esri.core.geometry.Geometry bufferout = GeometryEngine.project(buffer, srBuffer, srOut);
	String json = GeometryEngine.geometryToJson(srOut, bufferout);
	return spatial.fromJson(json);
	
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private MapGeometry constructBuffer(Geometry geo, double radius, Unit u) throws JsonParseException, IOException
{
	
	Polygon buffer = GeometryEngine.buffer(inGeometry, srBuffer, radius, u);
	Geometry bufferout = GeometryEngine.project(buffer, srBuffer, srOut);
	MapGeometry mapGeo = new MapGeometry(bufferout, srOut);
	return mapGeo;
	//String json = GeometryEngine.geometryToJson(srOut, bufferout);
	//return spatial.fromJson(json);
	
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
private MapGeometry constructBuffer(Geometry geo, double radius, Unit u)
		throws JsonParseException, IOException {
	Polygon buffer = GeometryEngine.buffer(inGeometry, srBuffer, radius, u);
	Geometry bufferout = GeometryEngine.project(buffer, srBuffer, srOut);
	MapGeometry mapGeo = new MapGeometry(bufferout, srOut);
	return mapGeo;
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
/**
 * Displays a temporary graphic on the map representing the bounds of the viewshed
 * that will be calculated if the given points are used.
 * @param viewshedCenter the center of the proposed viewshed (i.e. the observer).
 * @param radius the radius of the proposed viewshed.
 * @see #showViewshedBoundsGraphic(com.esri.core.geometry.Point, com.esri.core.geometry.Point)
 * @see #removeViewshedBoundsGraphic()
 */
public void showViewshedBoundsGraphic(Point viewshedCenter, double radius) {
    Polygon buffer = GeometryEngine.buffer(
            viewshedCenter,
            mapController.getSpatialReference(),
            radius,
            mapController.getSpatialReference().getUnit());
    if (0 > viewshedBoundsGraphicId) {
        viewshedBoundsGraphicId = addGraphic(
                new Graphic(buffer, VIEWSHED_BOUNDS_SYMBOL));
    } else {
        updateGraphic(viewshedBoundsGraphicId, buffer);
    }
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
@Override
public void onMouseClicked(MouseEvent event) {
  graphicsLayer.removeAll();

  // add buffer as a graphic
  Point mapPoint = map.toMapPoint(event.getX(), event.getY());
  final Geometry buffer = GeometryEngine.buffer(
      mapPoint, map.getSpatialReference(), 200000, map.getSpatialReference().getUnit());
  graphicsLayer.addGraphic(new Graphic(buffer, new SimpleFillSymbol(new Color(255, 0, 0, 255))));

  // get states at the buffered area
  QueryTask queryTask = new QueryTask(featureLayer.getUrl());
  QueryParameters queryParams = new QueryParameters();
  queryParams.setInSpatialReference(map.getSpatialReference());
  queryParams.setOutSpatialReference(map.getSpatialReference());
  queryParams.setGeometry(buffer);
  queryParams.setReturnGeometry(true);
  queryParams.setOutFields(new String[] {"STATE_NAME"});

  queryTask.execute(queryParams, new CallbackListener<FeatureResult>() {

    @Override
    public void onError(Throwable arg0) {
      // deal with any exception
    }

    @Override
    public void onCallback(FeatureResult result) {
      for (Object objFeature : result) {
        Feature feature = (Feature) objFeature;
        graphicsLayer.addGraphic(new Graphic(feature.getGeometry(), stateSymbol));
        graphicsLayer.addGraphic(new Graphic(buffer, new SimpleFillSymbol(new Color(255, 0, 0, 255))));


      }
    }
  });
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
@Override
public void onMouseClicked(MouseEvent e) {
  Point pt = map.toMapPoint(e.getX(), e.getY());

  Geometry buffer = GeometryEngine.buffer(pt, map.getSpatialReference(), 200000, map.getSpatialReference().getUnit());

  Graphic g = new Graphic(buffer, bufferSymbol);
  graphicsLayer.addGraphic(g);
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
@Override
public void onMouseClicked(MouseEvent event) {
  graphicsLayer.removeAll();

  // add buffer as a graphic
  Point mapPoint = map.toMapPoint(event.getX(), event.getY());
  Geometry buffer = GeometryEngine.buffer(
      mapPoint, map.getSpatialReference(), 200000, map.getSpatialReference().getUnit());
  graphicsLayer.addGraphic(new Graphic(buffer, new SimpleFillSymbol(new Color(100, 0, 0, 80))));

  // get states at the buffered area
  QueryTask queryTask = new QueryTask(featureLayer.getUrl());
  QueryParameters queryParams = new QueryParameters();
  queryParams.setInSpatialReference(map.getSpatialReference());
  queryParams.setOutSpatialReference(map.getSpatialReference());
  queryParams.setGeometry(buffer);
  queryParams.setReturnGeometry(true);
  queryParams.setOutFields(new String[] {"STATE_NAME"});

  queryTask.executeAsync(queryParams, new CallbackListener<FeatureResult>() {

    @Override
    public void onError(Throwable arg0) {
      // deal with any exception
    }

    @Override
    public void onCallback(FeatureResult result) {
      for (Object objFeature : result) {
        Feature feature = (Feature) objFeature;
        graphicsLayer.addGraphic(new Graphic(feature.getGeometry(), stateSymbol));
      }
    }
  });
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
/** Computes a buffer around {@code geom}. */
public static Geom ST_Buffer(Geom geom, double distance) {
  final Polygon g = GeometryEngine.buffer(geom.g(), geom.sr(), distance);
  return geom.wrap(g);
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
/**
 * Handle mouse-clicks.
 * On left-click - draws either a polyline or a point.
 * On right-click - computes and draws the buffer of the polyline or point.
 */
@Override
public void onMouseMoved(MouseEvent event) {
  super.onMouseMoved(event);

  gLayer.removeAll();

  Point currPoint = jMap.toMapPoint(event.getX(), event.getY());
  // point
  bufferedArea = GeometryEngine.buffer(
      currPoint,
      jMap.getSpatialReference(),
      BUFFER_DISTANCE,
      jMap.getSpatialReference().getUnit());
  Graphic currPointGraphic = new Graphic(currPoint, GeometryOfflineApp.SYM_POINT);
  gLayer.addGraphic(currPointGraphic);

  // add the buffered area to the graphics layer
  Graphic bufferedGraphic = new Graphic(bufferedArea, GeometryOfflineApp.SYM_BUFFER);
  gLayer.addGraphic(bufferedGraphic);

  if (queryInProgress.get() == false) {
    // query
    QueryParameters query = new QueryParameters();
    query.setReturnGeometry(true);
    query.setGeometry(bufferedArea);
    query.setOutFields(new String[] {"STATE_NAME"});

    // execute the query.
    table.queryFeatures(query, new CallbackListener<FeatureResult>() {

      
      @Override
      public void onError(Throwable e) {
        e.printStackTrace();
      }

      @Override
      public void onCallback(FeatureResult result) {
        gLayerResults.removeAll();
        for (Object objFeature : result) {
          Feature feature = (Feature) objFeature;
          gLayerResults.addGraphic(new Graphic(feature.getGeometry(), SYM_BUFFER));
        }
        queryInProgress.set(false);
      }
    });
    queryInProgress.set(true);
  }

  prevPoint = null;
  polyLine.setEmpty();

  return;
}
 

import com.esri.core.geometry.GeometryEngine; //导入方法依赖的package包/类
/**
 * Handle mouse-clicks.
 * On left-click - draws either a polyline or a point.
 * On right-click - computes and draws the buffer of the polyline or point.
 */
@Override
public void onMouseMoved(MouseEvent event) {
  super.onMouseMoved(event);

  gLayer.removeAll();

  Point currPoint = jMap.toMapPoint(event.getX(), event.getY());
  // point
  bufferedArea = GeometryEngine.buffer(
      currPoint,
      jMap.getSpatialReference(),
      BUFFER_DISTANCE,
      jMap.getSpatialReference().getUnit());
  Graphic currPointGraphic = new Graphic(currPoint, GeometryApp.SYM_POINT);
  gLayer.addGraphic(currPointGraphic);

  // add the buffered area to the graphics layer
  Graphic bufferedGraphic = new Graphic(bufferedArea, GeometryApp.SYM_BUFFER);
  gLayer.addGraphic(bufferedGraphic);

  if (queryInProgress.get() == false) {
    // query
    QueryParameters query = new QueryParameters();
    query.setReturnGeometry(true);
    query.setGeometry(bufferedArea);
    query.setOutFields(new String[] {"STATE_NAME"});

    // execute the query.
    table.queryFeatures(query, new CallbackListener<FeatureResult>() {

      
      @Override
      public void onError(Throwable e) {
        e.printStackTrace();
      }

      @Override
      public void onCallback(FeatureResult result) {
        gLayerResults.removeAll();
        for (Object objFeature : result) {
          Feature feature = (Feature) objFeature;
          gLayerResults.addGraphic(new Graphic(feature.getGeometry(), SYM_BUFFER));
        }
        queryInProgress.set(false);
      }
    });
    queryInProgress.set(true);
  }

  prevPoint = null;
  polyLine.setEmpty();

  return;
}