Simple renderer

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Sample viewer app

Display common symbols for all graphics in a graphics overlay with a renderer.

Image of simple 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

  1. Create a GraphicsOverlay.
  2. Create a number of Point objects with x, y and spatial reference parameters.
  3. Create a SimpleMarkerSymbol passing in a SimpleMarkerSymbol.Style, color and size as parameters.
  4. Create a simple renderer with SimpleRenderer(simpleMarkerSymbol).
  5. Set the simple renderer to the graphics overlay using graphicsOverlay.setRenderer(simpleRenderer).
  6. Create a number of Graphic objects with the points initiated in step 2.
  7. 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
                                                                                                                                  
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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.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 (0xFFFF0000) simple symbol for use in a simple renderer
      SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CROSS, 0xFFFF0000, 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);
  }
}

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