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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.using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Drawing;
using System.Windows;
namespaceArcGIS.WPF.Samples.IdentifyGraphics{
[ArcGIS.Samples.Shared.Attributes.Sample(
name: "Identify graphics",
category: "GraphicsOverlay",
description: "Display an alert message when a graphic is clicked.",
instructions: "Select a graphic to identify it. You will see an alert message displayed.",
tags: new[] { "graphics", "identify" })]
publicpartialclassIdentifyGraphics {
// Graphics overlay to host graphicsprivate GraphicsOverlay _polygonOverlay;
publicIdentifyGraphics() {
InitializeComponent();
// Create the UI, setup the control references and execute initialization Initialize();
}
privatevoidInitialize() {
// Create a map with 'Imagery with Labels' basemap and an initial location Map myMap = new Map(BasemapStyle.ArcGISTopographic);
// Create graphics overlay with graphics CreateOverlay();
// Hook into tapped event MyMapView.GeoViewTapped += OnMapViewTapped;
// Assign the map to the MapView MyMapView.Map = myMap;
}
privatevoidCreateOverlay() {
// Create polygon builder and add polygon corners into it PolygonBuilder builder = new PolygonBuilder(SpatialReferences.WebMercator);
builder.AddPoint(new MapPoint(-20e5, 20e5));
builder.AddPoint(new MapPoint(20e5, 20e5));
builder.AddPoint(new MapPoint(20e5, -20e5));
builder.AddPoint(new MapPoint(-20e5, -20e5));
// Get geometry from the builder Polygon polygonGeometry = builder.ToGeometry();
// Create symbol for the polygon SimpleFillSymbol polygonSymbol = new SimpleFillSymbol(
SimpleFillSymbolStyle.Solid,
Color.Yellow,
null);
// Create new graphic Graphic polygonGraphic = new Graphic(polygonGeometry, polygonSymbol);
// Create overlay to where graphics are shown _polygonOverlay = new GraphicsOverlay();
_polygonOverlay.Graphics.Add(polygonGraphic);
// Add created overlay to the MapView MyMapView.GraphicsOverlays.Add(_polygonOverlay);
}
privateasyncvoidOnMapViewTapped(object sender, GeoViewInputEventArgs e) {
double tolerance = 10d; // Use larger tolerance for touchint maximumResults = 1; // Only return one graphicbool onlyReturnPopups = false; // Return more than popupstry {
// Use the following method to identify graphics in a specific graphics overlay IdentifyGraphicsOverlayResult identifyResults = await MyMapView.IdentifyGraphicsOverlayAsync(
_polygonOverlay,
e.Position,
tolerance,
onlyReturnPopups,
maximumResults);
// Check if we got resultsif (identifyResults.Graphics.Count > 0)
{
// Display to the user the identify worked. MessageBox.Show("Tapped on graphic", "");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error");
}
}
}
}