A layer showing animal populations contains sublayers for different species. A renderer could be applied which gives each sublayer a different color, so that populations of each species can be compared visually.
How to use the sample
Wait for the map image layer to load. Press the Apply Renderer button to apply a unique value renderer to see different population ranges in the counties sub-layer data. Press the Reset button to go back to the original renderer.
How it works
Create an ArcGISMapImageLayer from its URL.
After it is done loading, get its SublayerList with imageLayer.mapImageSublayers.
Create a ClassBreaksRenderer with a collection of ClassBreaks for different population ranges.
Set the renderer of the sublayer with sublayer.renderer.
Relevant API
ArcGISMapImageLayer
ArcGISMapImageSubLayer
ClassBreaksRenderer
ClassBreaksRenderer.classBreak
About the data
This application displays census data from an ArcGIS Server map service. It contains various population statistics, including total population for each county in 2007.
Additional information
The service hosting the layer must support dynamic layers to be able to change the rendering of sublayers.
Tags
class breaks, dynamic layer, dynamic rendering, renderer, sublayer, symbology, visualization
Sample Code
ChangeSublayerRenderer.qml
Use dark colors for code blocksCopy
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// [WriteFile Name=ChangeSublayerRenderer, 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 originalRenderer: nullMapView {
id: mapViewanchors.fill: parentComponent.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation forceActiveFocus();
}
Map {
Basemap {
initStyle: Enums.BasemapStyleArcGISStreets
}
ArcGISMapImageLayer {
url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer"onLoadStatusChanged: {
if (loadStatus !== Enums.LoadStatusLoaded)
return;
// get the counties sublayer sublayer = mapImageSublayers.get(2);
// get the original renderer once loaded sublayer.loadStatusChanged.connect(()=> {
if (sublayer.loadStatus !== Enums.LoadStatusLoaded)
return;
originalRenderer = sublayer.renderer;
});
// load the sublayer sublayer.load();
}
}
ViewpointExtent {
Envelope {
xMin: -13834661.666904yMin: 331181.323482xMax: -8255704.998713yMax: 9118038.075882spatialReference: SpatialReference { wkid: 3857 }
}
}
}
}
// create class breaks renderer for the sublayerClassBreaksRenderer {
id: classBreaksRendererfieldName: "POP2007"// declare the class breaks that make up the renderer, along with// a symbol for each class breakClassBreak {
minValue: -99maxValue: 8560description: "-99 to 8560"label: description
SimpleFillSymbol {
color: Qt.rgba(0.89, 0.92, 0.81, 1)
outline: SimpleLineSymbol {
id: outlineSymbolcolor: Qt.rgba(0.6, 0.6, 0.6, 1)
width: 1 }
style: Enums.SimpleFillSymbolStyleSolid
}
}
ClassBreak {
minValue: 8560maxValue: 18109description: "> 8,560 to 18,109"label: description
SimpleFillSymbol {
color: Qt.rgba(0.59, 0.76, 0.75, 1)
outline: outlineSymbol
style: Enums.SimpleFillSymbolStyleSolid
}
}
ClassBreak {
minValue: 18109maxValue: 35501description: "> 18,109 to 35,501"label: description
SimpleFillSymbol {
color: Qt.rgba(0.38, 0.65, 0.71, 1)
outline: outlineSymbol
style: Enums.SimpleFillSymbolStyleSolid
}
}
ClassBreak {
minValue: 35501maxValue: 86100description: "> 35,501 to 86,100"label: description
SimpleFillSymbol {
color: Qt.rgba(0.27, 0.49, 0.59, 1)
outline: outlineSymbol
style: Enums.SimpleFillSymbolStyleSolid
}
}
ClassBreak {
minValue: 86100maxValue: 10110975description: "> 86,100 to 10,110,975"label: description
SimpleFillSymbol {
color: Qt.rgba(0.16, 0.33, 0.47, 1)
outline: outlineSymbol
style: Enums.SimpleFillSymbolStyleSolid
}
}
}
Column {
anchors {
left: parent.left
top: parent.top
margins: 5 }
spacing: 5Button {
width: 200text: "Apply Renderer"enabled: sublayer ? sublayer.loadStatus === Enums.LoadStatusLoaded : falseonClicked: sublayer.renderer = classBreaksRenderer;
}
Button {
width: 200text: "Reset"enabled: sublayer ? sublayer.loadStatus === Enums.LoadStatusLoaded : falseonClicked: sublayer.renderer = originalRenderer;
}
}
}