Change the style of a Web Map Service (WMS) layer.
Use case
Layers hosted on WMS may have different pre-set styles available to apply to them. Swapping between these styles can help during visual examination of the data. For example, increasing the contrast of satellite images can help in identifying urban and agricultural areas within forested areas.
How to use the sample
Select one of the styles and the map will update the display with the selected style.
How it works
Create a WmsLayer specifying the URL of the service and the layer names you want.
When the layer is done loading, get its list of style strings using wmsLayer.sublayers[0].sublayerInfo.styles.
Set one of the styles using wmsLayer.sublayers[0].currentStyle = styleString.
Relevant API
WmsLayer
WmsSublayer
WmsSublayerInfo
About the data
This sample uses a public service managed by the State of Minnesota and provides composite imagery for the state and the surrounding areas.
Tags
imagery, styles, visualization, WMS
Sample Code
StyleWmsLayer.qml
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// [WriteFile Name=StyleWmsLayer, Category=Layers]// [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
import QtQuick.Controls
import Esri.ArcGISRuntime
Rectangle {
id: rootRectangleclip: truewidth: 800height: 600property var sublayer: nullproperty var stylesMapView {
id: mapViewanchors.fill: parentComponent.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation forceActiveFocus();
}
Map {
// create a map with spatial reference appropriate for the WMS service (North American Datum 83)spatialReference: SpatialReference {wkid: 26915}
minScale: 7000000WmsLayer {
id: wmsLayerurl: "https://imageserver.gisdata.mn.gov/cgi-bin/mncomp?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetCapabilities"layerNames: ["mncomp"]
onLoadStatusChanged: {
if (loadStatus !== Enums.LoadStatusLoaded)
return;
// zoom to the layer mapView.setViewpointGeometry(fullExtent);
// get the subLayer sublayer = sublayers[0];
// get the styles styles = sublayer.sublayerInfo.styles;
}
}
}
}
Rectangle {
anchors {
fill: controlColumn
margins: -5 }
color: "lightgray"radius: 5opacity: 0.75 }
ButtonGroup {
buttons: controlColumn.children
}
Column {
id: controlColumnanchors {
left: parent.left
top: parent.top
margins: 10 }
spacing: 5RadioButton {
text: "Default"checked: trueonCheckedChanged: {
if (checked) {
if (!sublayer)
return;
// set the style string on the sublayer sublayer.currentStyle = styles[0];
}
}
}
RadioButton {
text: "Contrast Stretch"onCheckedChanged: {
if (checked) {
if (!sublayer)
return;
// set the style string on the sublayer sublayer.currentStyle = styles[1];
}
}
}
}
}