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.Graphics.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
// 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. using Esri.ArcGISRuntime.Geometry; using Esri.ArcGISRuntime.Mapping; using Esri.ArcGISRuntime.Symbology; using Esri.ArcGISRuntime.UI; using System.Drawing; namespace ArcGIS.WPF.Samples.SimpleRenderers { [ArcGIS.Samples.Shared.Attributes.Sample( name: "Simple renderer", category: "Symbology", description: "Display common symbols for all graphics in a graphics overlay with a renderer.", instructions: "The sample loads with a predefined simple renderer, which displays a red cross simple marker symbol for the graphics in the graphics overlay.", tags: new[] { "graphics", "marker", "renderer", "symbol", "symbolize", "symbology" })] public partial class SimpleRenderers { public SimpleRenderers() { InitializeComponent(); // Create the UI, setup the control references and execute initialization. Initialize(); } private void Initialize() { // Create new map with basemap layer. Map myMap = new Map(BasemapStyle.ArcGISImagery); // Create several map points using the WGS84 coordinates (latitude and longitude). MapPoint oldFaithfulPoint = new MapPoint(-110.828140, 44.460458, SpatialReferences.Wgs84); MapPoint cascadeGeyserPoint = new MapPoint(-110.829004, 44.462438, SpatialReferences.Wgs84); MapPoint plumeGeyserPoint = new MapPoint(-110.829381, 44.462735, SpatialReferences.Wgs84); // Use the two points farthest apart to create an envelope. Envelope initialEnvelope = new Envelope(oldFaithfulPoint, plumeGeyserPoint); // Set the map initial viewpoint myMap.InitialViewpoint = new Viewpoint(initialEnvelope); // Add the map to the map view MyMapView.Map = myMap; // Set the viewpoint to the envelope with padding. MyMapView.SetViewpointGeometryAsync(initialEnvelope, 50); // Create a graphics overlay. GraphicsOverlay myGraphicOverlay = new GraphicsOverlay(); // Create graphics based upon the map points. Graphic oldFaithfulGraphic = new Graphic(oldFaithfulPoint); Graphic cascadeGeyserGraphic = new Graphic(cascadeGeyserPoint); Graphic plumeGeyserGraphic = new Graphic(plumeGeyserPoint); // Add the graphics to the graphics overlay. myGraphicOverlay.Graphics.Add(oldFaithfulGraphic); myGraphicOverlay.Graphics.Add(cascadeGeyserGraphic); myGraphicOverlay.Graphics.Add(plumeGeyserGraphic); // Create a simple marker symbol - red, cross, size 12. SimpleMarkerSymbol mySymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Cross, Color.Red, 12); // Create a simple renderer based on the simple marker symbol. SimpleRenderer myRenderer = new SimpleRenderer(mySymbol); // Apply the renderer to the graphics overlay (all graphics use the same symbol). myGraphicOverlay.Renderer = myRenderer; // Add the graphics overlay to the map view. MyMapView.GraphicsOverlays.Add(myGraphicOverlay); } } }