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Restrict zooming between specific scale ranges.

Image of set min and max scale

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 ArcGISMap object.
  2. Set min and max scales of map with setMaxScale() and setMinScale().
  3. Set the map to a MapView object.

Relevant API

  • ArcGISMap
  • Basemap
  • MapView
  • ViewPoint

Tags

area of interest, level of detail, maximum, minimum, scale, viewpoint

Sample Code

SetMinAndMaxScaleViewModel.ktSetMinAndMaxScaleViewModel.ktMainActivity.ktSetMinAndMaxScaleScreen.kt
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/* Copyright 2025 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.
 *
 */

package com.esri.arcgismaps.sample.setminandmaxscale.components

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.launch

/**
 * ViewModel for the SetMinAndMaxScale sample.
 */
class SetMinAndMaxScaleViewModel(application: Application) : AndroidViewModel(application) {

    // Expose the map as a mutable state so the Compose UI can observe changes.
    var arcGISMap = ArcGISMap(BasemapStyle.ArcGISStreets).apply {
            // Set an initial viewpoint.
            initialViewpoint = Viewpoint(39.8, -98.6, 10e7)
            // Set sample min and max scales to demonstrate enforcing zoom limits.
            // Note: minScale represents the most zoomed-out denominator and
            // maxScale the most zoomed-in denominator.
            minScale = 8000.0
            maxScale = 2000.0
     }


    // Message dialog VM to show any errors during load.
    val messageDialogVM = MessageDialogViewModel()

    init {
        // Load the map and surface any load failures via the message dialog VM.
        viewModelScope.launch {
            arcGISMap.load().onFailure { throwable ->
                messageDialogVM.showMessageDialog(throwable)
            }
        }
    }
}

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