Simple renderer

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// Copyright 2022 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 Colors = System.Drawing.Color;

namespace ArcGIS.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 : ContentPage
    {
        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);

            // Use the envelope to define the map views visible area (include some padding around the extent).
            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, Colors.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);
        }
    }
}