Change basemap

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Sample viewer app

Change a map's basemap. A basemap is beneath all layers on a Map and is used to provide visual reference for the operational layers.

screenshot

Use case

Basemaps should selected contextually, for example, in maritime applications, it would be more appropriate to use a basemap of the world's oceans as opposed to a basemap of the world's streets.

How to use the sample

Use the drop down menu to select the active basemap from the list of available basemaps.

How it works

  1. Create a Map object.
  2. Set the map to the MapView object.
  3. Choose a new BasemapStyle to create a Basemap with.
  4. Set the basemap on the map.

Relevant API

  • BasemapStyle
  • Map
  • MapView

Tags

basemap, map

Sample Code

ChangeBasemap.qmlChangeBasemap.cppChangeBasemap.h
                                                                            
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// [WriteFile Name=ChangeBasemap, Category=Maps]
// [Legal]
// 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.
// [Legal]

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.Samples 1.0

ChangeBasemapSample {
    id: changeBasemapSample
    width: 800
    height: 600

    // add a mapView component
    MapView {
        id: mapView
        anchors.fill: parent
        objectName: "mapView"
    }

    ComboBox {
        id: comboBoxBasemap
        anchors {
            left: parent.left
            top: parent.top
            margins: 15
        }

        property int bestWidth: implicitWidth

        width: bestWidth + indicator.width + leftPadding + rightPadding

        model: ["Topographic","Streets",
            "Streets - Relief",
            "Streets - Night",
            "Imagery",
            "Imagery with Labels",
            "Labels without Imagery",
            "Dark Gray Canvas",
            "Light Gray Canvas",
            "Navigation",
            "OpenStreetMap",
            "Oceans"]

        onCurrentTextChanged: {
            // Call C++ invokable function to switch the basemaps
            changeBasemapSample.changeBasemap(currentText);
        }

        onModelChanged: {
            let w = bestWidth;
            for (let i = 0; i < comboBoxBasemap.model.length; ++i) {
                metrics.text = comboBoxBasemap.model[i];
                w = Math.max(w, metrics.width);
            }
            bestWidth = w;
        }

        TextMetrics {
            id: metrics
            font: comboBoxBasemap.font
        }
    }
}

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