Simple renderer

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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

MainActivity.java
                                                                                                                  
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/* Copyright 2016 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.arcgisruntime.sample.simplerenderer;

import android.graphics.Color;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
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 MainActivity extends AppCompatActivity {

  MapView mMapView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    //Create points to add graphics to the map to allow a renderer to style them
    //These are in WGS84 coordinates (Long, Lat)
    Point oldFaithfullPoint = new Point(-110.828140, 44.460458, SpatialReferences.getWgs84());
    Point cascadeGeyserPoint = new Point(-110.829004, 44.462438, SpatialReferences.getWgs84());
    Point plumeGeyserPoint = new Point(-110.829381, 44.462735, SpatialReferences.getWgs84());
    //Use the farthest points to create an envelope to use for the map views visible area
    Envelope initialEnvelope = new Envelope(oldFaithfullPoint, plumeGeyserPoint);

    // inflate MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a map with the imagery basemap. This will set the map to have a WebMercator spatial reference
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY);
    // set the map to be displayed in the mapview
    mMapView.setMap(map);

    //set initial envelope on the map view sith some padding so all points will be visible
    //This envelope is using the WGS84 points above, but is reprojected by the mapview into the maps spatial
      // reference, so its works fine
    mMapView.setViewpointGeometryAsync(initialEnvelope, 100);

    // create a new graphics overlay and add it to the mapview
    GraphicsOverlay graphicOverlay = new GraphicsOverlay();
    mMapView.getGraphicsOverlays().add(graphicOverlay);

    //[DocRef: Name=Simple Renderer, Category=Fundamentals, Topic=Symbols and Renderers]
    //create a simple symbol for use in a simple renderer
    SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CROSS, Color.RED,
        12); //size 12, style of cross
    SimpleRenderer renderer = new SimpleRenderer(symbol);

    //apply the renderer to the graphics overlay (so all graphics will use the same symbol from the renderer)
    graphicOverlay.setRenderer(renderer);
    //[DocRef: END]

    //create graphics from the geyser location points. NOTE: no need to set the symbol on the graphic because the
      // renderer takes care of it
    //The points are in WGS84, but graphics get reprojected automatically, so they work fine in a map with a spatial
      // reference of web mercator
    Graphic oldFaithfullGraphic = new Graphic(oldFaithfullPoint);
    Graphic cascadeGeyserGraphic = new Graphic(cascadeGeyserPoint);
    Graphic plumeGeyserGraphic = new Graphic(plumeGeyserPoint);
    graphicOverlay.getGraphics().add(oldFaithfullGraphic);
    graphicOverlay.getGraphics().add(cascadeGeyserGraphic);
    graphicOverlay.getGraphics().add(plumeGeyserGraphic);

  }

  @Override
  protected void onPause() {
    super.onPause();
    // pause MapView
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    // resume MapView
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }
}

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