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ArcGIS Runtime SDK for .NET

Set min & max scale

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

Restrict zooming between specific scale ranges.

screenshot

Use case

Data may only appear at a certain scale on a map, and may be visually lost if zooming too far in or out. Setting the minimum and maximum scales ensures the zoom extents are appropriately limited for the purposes of the map.

How to use the sample

Zoom in and out of the map. The zoom extents of the map are limited between the given minimum and maximum scales.

How it works

  1. Instantiate an Map object.
  2. Set min and max scales of map with the MinScale and MaxScale properties.
  3. Display the map in a map view.

Relevant API

  • Map
  • Basemap
  • MapView
  • ViewPoint

Tags

MaxScale, MinScale, Viewpoint, area of interest, level of detail

Sample Code

<UserControl 
    x:Class="ArcGISRuntime.UWP.Samples.SetMinMaxScale.SetMinMaxScale"
    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.SetMinMaxScale
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Set min & max scale",
        "Map",
        "This sample demonstrates how to set the minimum and maximum scale of a Map. Setting the minimum and maximum scale for the Map can be useful in keeping the user focused at a certain level of detail.",
        "")]
    public partial class SetMinMaxScale
    {
        public SetMinMaxScale()
        {
            InitializeComponent();

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

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

                // Set the scale at which this layer can be viewed
                // MinScale defines how far 'out' you can zoom where
                // MaxScale defines how far 'in' you can zoom.
                MinScale = 8000,
                MaxScale = 2000
            };

            // Create central point where map is centered
            MapPoint centralPoint = new MapPoint(-355453, 7548720, SpatialReferences.WebMercator);

            // Create starting viewpoint
            Viewpoint startingViewpoint = new Viewpoint(
                centralPoint,
                3000);
            // Set starting viewpoint
            myMap.InitialViewpoint = startingViewpoint;

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