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ArcGIS Runtime SDK for .NET

Map initial extent

This code sample is available for these platforms:
View Sample on GitHub

Display the map at an initial viewpoint representing a bounding geometry.

Image of map initial extent

Use case

Setting the initial viewpoint is useful when a user wishes to first load the map at a particular area of interest.

How to use the sample

When the sample loads, note that the map view opens at the initial viewpoint defined on the map.

How it works

  1. Instantiate a Map object.
  2. Instantiate a Viewpoint object using an Envelope object.
  3. Set the starting location of the map with map.InitialViewpoint.
  4. Set the map in the MapView.

Relevant API

  • Envelope
  • Map
  • MapView
  • Point
  • Viewpoint

Tags

extent, envelope, initial, viewpoint, zoom

Sample Code

<UserControl 
    x:Class="ArcGISRuntime.UWP.Samples.SetInitialMapArea.SetInitialMapArea"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls"
    mc:Ignorable="d" 
    d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <esriUI:MapView x:Name="MyMapView"/>
    </Grid>
</UserControl>
// 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.Geometry;
using Esri.ArcGISRuntime.Mapping;

namespace ArcGISRuntime.UWP.Samples.SetInitialMapArea
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Map initial extent",
        category: "Map",
        description: "Display the map at an initial viewpoint representing a bounding geometry.",
        instructions: "When the sample loads, note that the map view opens at the initial viewpoint defined on the map.",
        tags: new[] { "envelope", "extent", "initial", "viewpoint", "zoom" })]
    public partial class SetInitialMapArea
    {
        public SetInitialMapArea()
        {
            InitializeComponent();

            // Create the UI, setup the control references and execute initialization 
            Initialize();
        }

        private void Initialize()
        {
            // Create new Map with basemap
            Map myMap = new Map(Basemap.CreateImagery());

            // Create and set initial map area
            Envelope initialLocation = new Envelope(
                -12211308.778729, 4645116.003309, -12208257.879667, 4650542.535773,
                SpatialReferences.WebMercator);
            myMap.InitialViewpoint = new Viewpoint(initialLocation);

            // Assign the map to the MapView
            MyMapView.Map = myMap;
        }
    }
}