Add graphics with renderer

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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 affect graphics that do not specify their own symbol style.

Image of add 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

Pan and zoom on the map to view graphics for points, lines, and polygons (including polygons with curve segments) which are stylized using renderers.

How it works

  1. Create a GraphicsOverlay and add it to the MapView.
  2. Create a Graphic, specifying only a Geometry.
  3. Create a single Symbol such as a SimpleMarkerSymbol.
  4. Create a renderer with the Symbol such as new SimpleRenderer(symbol).
  5. Set the renderer on the GraphicsOverlay with graphicsOverlay.Renderer(renderer).

Relevant API

  • CubicBezierSegment
  • EllipticArcSegment
  • Geometry
  • Graphic
  • GraphicsOverlay
  • Part
  • 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 "Add graphics with symbols" sample.

Tags

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

Sample Code

AddGraphicsRenderer.cs
                                                                                                                                                                                                                       
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// Copyright 2021 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.

using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Drawing;
using UIKit;

namespace ArcGISRuntime.Samples.AddGraphicsRenderer
{
    [Register("AddGraphicsRenderer")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Add graphics with renderer",
        category: "GraphicsOverlay",
        description: "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 affect graphics that do not specify their own symbol style.",
        instructions: "Pan and zoom on the map to view graphics for points, lines, and polygons (including polygons with curve segments) which are stylized using renderers.",
        tags: new[] { "arc", "bezier", "curve", "display", "graphics", "marker", "overlay", "renderer", "segment", "symbol", "true curve", "Featured" })]
    public class AddGraphicsRenderer : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public AddGraphicsRenderer()
        {
            Title = "Add graphics with renderer";
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        private void Initialize()
        {
            // Create a map for the map view.
            _myMapView.Map = new Map(BasemapStyle.ArcGISTopographic);

            // Add graphics overlays to the map view.
            _myMapView.GraphicsOverlays.AddRange(new[]
            {
                MakePointGraphicsOverlay(),
                MakeLineGraphicsOverlay(),
                MakeSquareGraphicsOverlay(),
                MakeCurvedGraphicsOverlay(),
            });
        }

        private GraphicsOverlay MakePointGraphicsOverlay()
        {
            // Create a simple marker symbol.
            SimpleMarkerSymbol pointSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.Green, 10);

            // Create a graphics overlay for the points.
            GraphicsOverlay pointGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            pointGraphicsOverlay.Renderer = new SimpleRenderer(pointSymbol);

            // Create a graphic with the map point geometry.
            MapPoint pointGeometry = new MapPoint(x: 40e5, y: 40e5, SpatialReferences.WebMercator);
            Graphic pointGraphic = new Graphic(pointGeometry);

            // Add the graphic to the overlay.
            pointGraphicsOverlay.Graphics.Add(pointGraphic);
            return pointGraphicsOverlay;
        }

        private GraphicsOverlay MakeLineGraphicsOverlay()
        {
            // Create a simple line symbol.
            SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 5);

            // Create a graphics overlay for the polylines.
            GraphicsOverlay lineGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            lineGraphicsOverlay.Renderer = new SimpleRenderer(lineSymbol);

            // Create a line graphic with new Polyline geometry.
            PolylineBuilder lineBuilder = new PolylineBuilder(SpatialReferences.WebMercator);
            lineBuilder.AddPoint(x: -10e5, y: 40e5);
            lineBuilder.AddPoint(x: 20e5, y: 50e5);
            Graphic lineGraphic = new Graphic(lineBuilder.ToGeometry());

            // Add the graphic to the overlay.
            lineGraphicsOverlay.Graphics.Add(lineGraphic);
            return lineGraphicsOverlay;
        }

        private GraphicsOverlay MakeSquareGraphicsOverlay()
        {
            // Create a simple fill symbol.
            SimpleFillSymbol squareSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Yellow, null);

            // Create a graphics overlay for the square polygons.
            GraphicsOverlay squareGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            squareGraphicsOverlay.Renderer = new SimpleRenderer(squareSymbol);

            // Create a polygon graphic with `new Polygon` geometry.
            PolygonBuilder polygonBuilder = new PolygonBuilder(SpatialReferences.WebMercator);
            polygonBuilder.AddPoint(x: -20e5, y: 20e5);
            polygonBuilder.AddPoint(x: 20e5, y: 20e5);
            polygonBuilder.AddPoint(x: 20e5, y: -20e5);
            polygonBuilder.AddPoint(x: -20e5, y: -20e5);
            Graphic polygonGraphic = new Graphic(polygonBuilder.ToGeometry());

            // Add the graphic to the overlay.
            squareGraphicsOverlay.Graphics.Add(polygonGraphic);
            return squareGraphicsOverlay;
        }

        private GraphicsOverlay MakeCurvedGraphicsOverlay()
        {
            // Create a simple fill symbol with outline.
            SimpleLineSymbol curvedLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Black, 1);
            SimpleFillSymbol curvedFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Red, curvedLineSymbol);

            // Create a graphics overlay for the polygons with curve segments.
            GraphicsOverlay curvedGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            curvedGraphicsOverlay.Renderer = new SimpleRenderer(curvedFillSymbol);

            // Create a heart-shaped graphic.
            MapPoint origin = new MapPoint(x: 40e5, y: 5e5, SpatialReferences.WebMercator);
            Geometry heartGeometry = MakeHeartGeometry(origin, 10e5);
            Graphic heartGraphic = new Graphic(heartGeometry);
            curvedGraphicsOverlay.Graphics.Add(heartGraphic);
            return curvedGraphicsOverlay;
        }

        private Geometry MakeHeartGeometry(MapPoint center, double sideLength)
        {
            if (sideLength <= 0) return null;

            SpatialReference spatialReference = center.SpatialReference;

            // The x and y coordinates to simplify the calculation.
            double minX = center.X - 0.5 * sideLength;
            double minY = center.Y - 0.5 * sideLength;

            // The radius of the arcs.
            double arcRadius = sideLength * 0.25;

            // Bottom left curve.
            MapPoint leftCurveStart = new MapPoint(center.X, minY, spatialReference);
            MapPoint leftCurveEnd = new MapPoint(minX, minY + 0.75 * sideLength, spatialReference);
            MapPoint leftControlMapPoint1 = new MapPoint(center.X, minY + 0.25 * sideLength, spatialReference);
            MapPoint leftControlMapPoint2 = new MapPoint(minX, center.Y, spatialReference: spatialReference);
            CubicBezierSegment leftCurve = new CubicBezierSegment(leftCurveStart, leftControlMapPoint1, leftControlMapPoint2, leftCurveEnd, spatialReference);

            // Top left arc.
            MapPoint leftArcCenter = new MapPoint(minX + 0.25 * sideLength, minY + 0.75 * sideLength, spatialReference);
            EllipticArcSegment leftArc = EllipticArcSegment.CreateCircularEllipticArc(leftArcCenter, arcRadius, Math.PI, centralAngle: -Math.PI, spatialReference);

            // Top right arc.
            MapPoint rightArcCenter = new MapPoint(minX + 0.75 * sideLength, minY + 0.75 * sideLength, spatialReference);
            EllipticArcSegment rightArc = EllipticArcSegment.CreateCircularEllipticArc(rightArcCenter, arcRadius, Math.PI, centralAngle: -Math.PI, spatialReference);

            // Bottom right curve.
            MapPoint rightCurveStart = new MapPoint(minX + sideLength, minY + 0.75 * sideLength, spatialReference);
            MapPoint rightCurveEnd = leftCurveStart;
            MapPoint rightControlMapPoint1 = new MapPoint(minX + sideLength, center.Y, spatialReference);
            MapPoint rightControlMapPoint2 = leftControlMapPoint1;
            CubicBezierSegment rightCurve = new CubicBezierSegment(rightCurveStart, rightControlMapPoint1, rightControlMapPoint2, rightCurveEnd, spatialReference);

            // Create the heart polygon.
            Part newPart = new Part(new Segment[]
            {
                leftCurve,
                leftArc,
                rightArc,
                rightCurve
            }, spatialReference);
            PolygonBuilder builder = new PolygonBuilder(spatialReference);
            builder.AddPart(newPart);
            return builder.ToGeometry();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubviews(_myMapView);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }
    }
}

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