Display common symbols for all graphics in a graphics overlay with a renderer.
Use case
Graphics are often used to display data that changes location regularly because they are held in memory instead of being persisted to the map. When a number of graphics are required to share the same style, a simple renderer can be applied to the graphics overlay containing the graphics. For example, the location of mobile taxis from a same company could be plotted on a map with each taxi marked by a relevant symbol.
How to use the sample
The sample loads with a predefined simple renderer, which displays a red cross simple marker symbol for the graphics in the graphics overlay.
How it works
Create a GraphicsOverlay.
Create a number of Point objects with x, y and spatial reference parameters.
Create a SimpleMarkerSymbol passing in a SimpleMarkerSymbol.Style, color and size as parameters.
Create a simple renderer with SimpleRenderer(simpleMarkerSymbol).
Set the simple renderer to the graphics overlay using graphicsOverlay.setRenderer(simpleRenderer).
Create a number of Graphic objects with the points initiated in step 2.
Add the graphics to the graphics overlay with graphicsOverlay.getGraphics().add(graphic).
Relevant API
Graphic
GraphicsOverlay
Point
SimpleMarkerSymbol
SimpleRenderer
Additional information
Renderers are used to display graphics that don't already have a symbol set. A renderer will not override a graphic's symbol if one has been set.
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/*
* Copyright 2017 Esri.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/package com.esri.samples.simple_renderer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;
publicclassSimpleRendererSampleextendsApplication{
private MapView mapView;
@Overridepublicvoidstart(Stage stage){
try {
// create stack pane and application scene StackPane stackPane = new StackPane();
Scene scene = new Scene(stackPane);
// size the stage, add a title, and set scene to stage stage.setTitle("Simple Renderer Sample");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(scene);
stage.show();
// authentication with an API key or named user is required to access basemaps and other location services String yourAPIKey = System.getProperty("apiKey");
ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);
// create a map with the imagery basemap stylefinal ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY);
// create a map view and set the map to it mapView = new MapView();
mapView.setMap(map);
// create a spatial reference for the pointsfinal SpatialReference spatialReference = SpatialReferences.getWgs84();
// create points for displaying graphics Point oldFaithfulPoint = new Point(-110.828140, 44.460458, spatialReference);
Point cascadeGeyserPoint = new Point(-110.829004, 44.462438, spatialReference);
Point plumeGeyserPoint = new Point(-110.829381, 44.462735, spatialReference);
// create initial viewpoint using an envelope Envelope envelope = new Envelope(oldFaithfulPoint, plumeGeyserPoint);
// set viewpoint on map view with padding mapView.setViewpointGeometryAsync(envelope, 100.0);
// create a graphics overlay and add it to the map view GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
mapView.getGraphicsOverlays().add(graphicsOverlay);
// create a red simple symbol for use in a simple renderer SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CROSS, Color.RED, 12);
SimpleRenderer renderer = new SimpleRenderer(symbol);
// apply the renderer to the graphics overlay graphicsOverlay.setRenderer(renderer);
// create graphics from the location points. Graphic oldFaithfulGraphic = new Graphic(oldFaithfulPoint);
Graphic cascadeGeyserGraphic = new Graphic(cascadeGeyserPoint);
Graphic plumeGeyserGraphic = new Graphic(plumeGeyserPoint);
graphicsOverlay.getGraphics().add(oldFaithfulGraphic);
graphicsOverlay.getGraphics().add(cascadeGeyserGraphic);
graphicsOverlay.getGraphics().add(plumeGeyserGraphic);
// add the map view and control box to stack pane stackPane.getChildren().add(mapView);
} catch (Exception e) {
// on any error, display stack trace e.printStackTrace();
}
}
/**
* Stops and releases all resources used in application.
*/@Overridepublicvoidstop(){
// release resources when the application closesif (mapView != null) {
mapView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}