Min-Max scale

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Sample viewer app

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. Create a Map object.
  2. Set min and max scales of map with the maxScale and minScale properties.
  3. Set the map to a MapView object.

Relevant API

  • Basemap
  • Map
  • MapView
  • ViewPoint

Tags

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

Sample Code

MinMaxScale.qml
                                                
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// [WriteFile Name=MinMaxScale, Category=Maps]
// [Legal]
// Copyright 2018 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.
// [Legal]

import QtQuick 2.6
import Esri.ArcGISRuntime 100.12

Rectangle {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    MapView {
        id: mapView
        anchors.fill: parent

        Map {
            Basemap {
                initStyle: Enums.BasemapStyleArcGISStreets
            }
            minScale: 8000
            maxScale: 2000
            initialViewpoint: ViewpointCenter {
                center: Point {
                    x: -3.1927
                    y: 55.9515
                    spatialReference: SpatialReference {
                        wkid: 4326
                    }
                }
                targetScale: 8000
            }
        }
    }
}

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