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
Pointobjects with x, y and spatial reference parameters. - Create a
SimpleMarkerSymbolpassing in aSimpleMarkerSymbol.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
Graphicobjects 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.
Tags
graphics, marker, renderer, symbol, symbolize, symbology
Sample Code
SimpleRendererSample.java
/* * 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; public class SimpleRendererSample extends Application { private MapView mapView; @Override public void start(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 style final 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 points final 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. */ @Override public void stop() { // release resources when the application closes if (mapView != null) { mapView.dispose(); } } /** * Opens and runs application. * * @param args arguments passed to this application */ public static void main(String[] args) { Application.launch(args); } }