Add graphics with renderer

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Sample viewer app

A renderer allows you to change the style of all graphics in a graphics overlay by referencing a single symbol style. A renderer will only effect graphics that do not specify their own symbol style.

Image of adding graphics with renderer

Use case

A renderer allows you to change the style of all graphics in an overlay by only changing one copy of the symbol. For example, a user may wish to display a number of graphics on a map of parkland which represent trees, all sharing a common symbol.

How to use the sample

Run the sample and view graphics for points, lines, and polygons, which are stylized using renderers.

How it works

  • Create a GraphicsOverlay and add it to the MapView.
  • Create a Graphic, specifying only a Geometry.
  • Create a single Symbol such as a SimpleMarkerSymbol.
  • Create a renderer with the Symbol such as a SimpleRenderer(symbol).
  • Set the renderer on the GraphicsOverlay with graphicsOverlay.setRenderer(renderer).

Relevant API

  • CubicBezierSegment
  • EllipticArcSegment
  • Geometry
  • Graphic
  • GraphicsOverlay
  • MutablePart
  • PolygonBuilder
  • PolylineBuilder
  • SimpleFillSymbol
  • SimpleLineSymbol
  • SimpleMarkerSymbol
  • SimpleRenderer

Additional information

To set unique symbols across a number of graphics (e.g. showing graphics of individual landmarks) see the "Add graphics with symbols" sample.

Tags

arc, bezier, curve, display, graphics, marker, overlay, renderer, segment, symbol, true curve

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.addgraphicsrenderer;

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

import androidx.appcompat.app.AppCompatActivity;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.CubicBezierSegment;
import com.esri.arcgisruntime.geometry.EllipticArcSegment;
import com.esri.arcgisruntime.geometry.Geometry;
import com.esri.arcgisruntime.geometry.Part;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.Polygon;
import com.esri.arcgisruntime.geometry.PolygonBuilder;
import com.esri.arcgisruntime.geometry.PolylineBuilder;
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.Viewpoint;
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.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

public class MainActivity extends AppCompatActivity {

  private 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 MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a map with the Basemap Type topographic
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    // add graphics overlay
    addGraphicsOverlay();
    // set the map to be displayed in this view
    mMapView.setMap(map);
    mMapView.setViewpoint(new Viewpoint(15.169193, 16.333479, 100000000.0));
  }

  private void addGraphicsOverlay() {
    // point graphic
    Point pointGeometry = new Point(40e5, 40e5, SpatialReferences.getWebMercator());
    // red diamond point symbol
    SimpleMarkerSymbol pointSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.DIAMOND,
        Color.RED, 10);
    // create graphic for point
    Graphic pointGraphic = new Graphic(pointGeometry);
    // create a graphic overlay for the point
    GraphicsOverlay pointGraphicOverlay = new GraphicsOverlay();
    // create simple renderer
    SimpleRenderer pointRenderer = new SimpleRenderer(pointSymbol);
    pointGraphicOverlay.setRenderer(pointRenderer);
    // add graphic to overlay
    pointGraphicOverlay.getGraphics().add(pointGraphic);
    // add graphics overlay to the MapView
    mMapView.getGraphicsOverlays().add(pointGraphicOverlay);

    // line graphic
    PolylineBuilder lineGeometry = new PolylineBuilder(SpatialReferences.getWebMercator());
    lineGeometry.addPoint(-10e5, 40e5);
    lineGeometry.addPoint(20e5, 50e5);
    // solid blue line symbol
    SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 5);
    // create graphic for polyline
    Graphic lineGraphic = new Graphic(lineGeometry.toGeometry());
    // create graphic overlay for polyline
    GraphicsOverlay lineGraphicOverlay = new GraphicsOverlay();
    // create simple renderer
    SimpleRenderer lineRenderer = new SimpleRenderer(lineSymbol);
    // add graphic to overlay
    lineGraphicOverlay.setRenderer(lineRenderer);
    // add graphic to overlay
    lineGraphicOverlay.getGraphics().add(lineGraphic);
    // add graphics overlay to the MapView
    mMapView.getGraphicsOverlays().add(lineGraphicOverlay);

    // polygon graphic
    PolygonBuilder polygonGeometry = new PolygonBuilder(SpatialReferences.getWebMercator());
    polygonGeometry.addPoint(-20e5, 20e5);
    polygonGeometry.addPoint(20e5, 20e5);
    polygonGeometry.addPoint(20e5, -20e5);
    polygonGeometry.addPoint(-20e5, -20e5);
    // solid yellow polygon symbol
    SimpleFillSymbol polygonSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID,
        Color.YELLOW, null);
    // create graphic for polygon
    Graphic polygonGraphic = new Graphic(polygonGeometry.toGeometry());
    // create graphic overlay for polygon
    GraphicsOverlay polygonGraphicOverlay = new GraphicsOverlay();
    // create simple renderer
    SimpleRenderer polygonRenderer = new SimpleRenderer(polygonSymbol);
    // add graphic to overlay
    polygonGraphicOverlay.setRenderer(polygonRenderer);
    // add graphic to overlay
    polygonGraphicOverlay.getGraphics().add(polygonGraphic);
    // add graphics overlay to MapView
    mMapView.getGraphicsOverlays().add(polygonGraphicOverlay);

    // curved polygon graphic
    // create a point for the center of the geometry
    Point originPoint = new Point(40e5, 5e5, SpatialReferences.getWebMercator());
    // create polygon
    Geometry curvedPolygonGeometry = makeHeartGeometry(originPoint, 10e5);
    // create graphic for polygon
    Graphic curvedPolygonGraphic = new Graphic(curvedPolygonGeometry);
    // create a simple fill symbol with outline
    SimpleLineSymbol curvedLineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID,
        Color.BLACK, 1f);
    SimpleFillSymbol curvedFillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID,
        Color.RED, curvedLineSymbol);
    // create simple renderer
    SimpleRenderer curvedPolygonRenderer = new SimpleRenderer(curvedFillSymbol);

    // create graphic overlay for polygon and add it to the map view
    GraphicsOverlay curvedPolygonGraphicsOverlay = new GraphicsOverlay();
    // add graphic to overlay
    curvedPolygonGraphicsOverlay.getGraphics().add(curvedPolygonGraphic);
    // set the renderer on the graphics overlay to the new renderer
    curvedPolygonGraphicsOverlay.setRenderer(curvedPolygonRenderer);
    // add graphics overlay to MapView
    mMapView.getGraphicsOverlays().add(curvedPolygonGraphicsOverlay);
  }

  /**
   * Create a heart-shape geometry with Bezier and elliptic arc segments from a given point and
   * side length.
   *
   * @param center of the heart shape
   * @param sideLength of the heart shape
   *
   * @return a heart shaped {@link Geometry}
   */
  private static Geometry makeHeartGeometry(Point center, double sideLength) {
    SpatialReference spatialReference = center.getSpatialReference();
    // the x and y coordinates to simplify the calculation
    double minX = center.getX() - 0.5 * sideLength;
    double minY = center.getY() - 0.5 * sideLength;
    // the radius of the arcs
    double arcRadius = sideLength * 0.25;

    // bottom left curve
    Point leftCurveStart = new Point(center.getX(), minY, spatialReference);
    Point leftCurveEnd = new Point(minX, minY + 0.75 * sideLength, spatialReference);
    Point leftControlPoint1 = new Point(center.getX(), minY + 0.25 * sideLength, spatialReference);
    Point leftControlPoint2 = new Point(minX, center.getY(), spatialReference);
    CubicBezierSegment leftCurve = new CubicBezierSegment(
        leftCurveStart,
        leftControlPoint1,
        leftControlPoint2,
        leftCurveEnd,
        spatialReference
    );

    // top left arc
    Point leftArcCenter =
        new Point(minX + 0.25 * sideLength, minY + 0.75 * sideLength, spatialReference);
    EllipticArcSegment leftArc = EllipticArcSegment.createCircularEllipticArc(
        leftArcCenter,
        arcRadius,
        Math.PI,
        -Math.PI,
        spatialReference
    );

    // top right arc
    Point rightArcCenter =
        new Point(minX + 0.75 * sideLength, minY + 0.75 * sideLength, spatialReference);
    EllipticArcSegment rightArc = EllipticArcSegment.createCircularEllipticArc(
        rightArcCenter,
        arcRadius,
        Math.PI,
        -Math.PI,
        spatialReference
    );

    // bottom right curve
    Point rightCurveStart = new Point(minX + sideLength, minY + 0.75 * sideLength,
        spatialReference);
    Point rightCurveEnd = leftCurveStart;
    Point rightControlPoint1 = new Point(minX + sideLength, center.getY(), spatialReference);
    Point rightControlPoint2 = leftControlPoint1;
    CubicBezierSegment rightCurve = new CubicBezierSegment(
        rightCurveStart,
        rightControlPoint1,
        rightControlPoint2,
        rightCurveEnd,
        spatialReference
    );

    Part heart = new Part(spatialReference);
    heart.add(leftCurve);
    heart.add(leftArc);
    heart.add(rightArc);
    heart.add(rightCurve);

    return new Polygon(heart, spatialReference);
  }

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

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

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

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