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 new WmsLayer(url, names).
When the layer is done loading, get it's list of style strings using wmsLayer::sublayers()::at(0)::sublayerInfo()::styles().
Set one of the styles using wmsLayer::sublayers()::at(0)::setCurrentStyle(styleString).
Relevant API
WmsLayer
WmsSublayer
WmsSublayer::currentStyle
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.
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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]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"StyleWmsLayer.h"#include"Map.h"#include"MapQuickView.h"#include"SpatialReference.h"#include"WmsLayer.h"#include"WmsSublayer.h"#include"WmsLayerInfo.h"#include"Error.h"#include"TaskWatcher.h"#include"LayerListModel.h"#include"Envelope.h"usingnamespace Esri::ArcGISRuntime;
StyleWmsLayer::StyleWmsLayer(QQuickItem* parent /* = nullptr */):
QQuickItem(parent)
{
}
voidStyleWmsLayer::init(){
// Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<StyleWmsLayer>("Esri.Samples", 1, 0, "StyleWmsLayerSample");
}
voidStyleWmsLayer::componentComplete(){
QQuickItem::componentComplete();
// find QML MapView component m_mapView = findChild<MapQuickView*>("mapView");
// Create a map with spatial reference appropriate for the WMS service (North American Datum 83) m_map = newMap(SpatialReference(26915), this);
m_map->setMinScale(7'000'000);
// Add a WMS Layer WmsLayer* wmsLayer = newWmsLayer(QUrl("https://imageserver.gisdata.mn.gov/cgi-bin/mncomp?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetCapabilities"), QStringList{"mncomp"}, this);
m_map->operationalLayers()->append(wmsLayer);
// connect to the doneLoading signal of the WMS Layerconnect(wmsLayer, &WmsLayer::doneLoading, this, [this, wmsLayer](const Error& e)
{
if (!e.isEmpty())
return;
// zoom to the layer m_mapView->setViewpointGeometry(wmsLayer->fullExtent());
// get the subLayerif (!wmsLayer->sublayers().empty())
m_wmsSublayer = wmsLayer->sublayers().at(0);
});
// Set map to map view m_mapView->setMap(m_map);
}
voidStyleWmsLayer::setCurrentStyle(int index){
if (!m_wmsSublayer)
return;
// get the stylesconst QStringList styles = m_wmsSublayer->sublayerInfo().styles();
if (styles.length() < index + 1)
return;
// get the styleconst QString style = styles.at(index);
// set the style on the WMS Sublayer m_wmsSublayer->setCurrentStyle(style);
}
