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This sample demonstrates applying a dictionary renderer to graphics, in order to display military symbology without the need for a feature table.
Use case
Use a dictionary renderer on a graphics overlay to display more transient data, such as military messages coming through a local tactical network.
How to use the sample
Run the sample and view the military symbols on the map.
How it works
Create a new GraphicsOverlay
.
Create a new DictionaryRenderer
and set it to the graphics overlay.
Create a new DictionarySymbolStyle
.
Parse through the XML and create a Graphic
for each element:
i. Use the _wkid
key to get the geometry's spatial reference.
ii. Use the _control_points
key to get the geometry's shape.
iii. Create a geometry using the shape and spatial reference from above.
iv. Create a Graphic
for each attribute, utilizing its defined geometry.
v. Add the graphic to the graphics overlay.
Relevant API
DictionaryRenderer
DictionarySymbolStyle
GraphicsOverlay
Offline data
To set up the sample's offline data, see the Use offline data in the samples section of the Qt Samples repository overview.
About the data
The sample opens to a view of the county Wiltshire, United Kingdom. It displays military symbols illustrating a simulated combat situation in the area.
defense, military, situational awareness, tactical, visualization
Sample CodeGODictionaryRenderer.qml GODictionaryRenderer.qml XmlParser.cpp XmlParser.h
Use dark colors for code blocks Copy
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// [WriteFile Name=GODictionaryRenderer, Category=DisplayInformation]
// [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
import QtQuick.Controls
import Esri.ArcGISRuntime
import Esri.ArcGISExtras
import Esri.samples
Rectangle {
width : 800
height : 600
readonly property url dataPath : {
Qt.platform.os === "ios" ?
System.writableLocationUrl(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data" :
System.writableLocationUrl(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data"
}
property bool graphicsLoaded : false
// Create MapView that a GraphicsOverlay
// for the military symbols.
MapView {
id: mapView
anchors.fill : parent
Map {
id: map
Basemap {
initStyle : Enums.BasemapStyleArcGISTopographic
}
}
Component.onCompleted : {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
// Read the XML file and create a graphic from each entry
xmlParser.parseXmlFileAsync(dataPath + "/xml/arcade_style/Mil2525DMessages.xml" );
}
// The GraphicsOverlay does not have a valid extent until it has been added
// to a MapView with a valid SpatialReference
onSpatialReferenceChanged : {
setViewpointGeometryAndPadding( graphicsOverlay.extent, 20 );
}
//! [Apply Dictionary Renderer Graphics Overlay QML]
GraphicsOverlay {
id: graphicsOverlay
DictionaryRenderer {
id: dictionaryRenderer
dictionarySymbolStyle : Factory.DictionarySymbolStyle.createFromFile(dataPath + "/styles/arcade_style/mil2525d.stylx" )
Component.onCompleted : {
dictionarySymbolStyle.loadStatusChanged.connect(() => {
if (dictionarySymbolStyle.loadStatus === Enums.LoadStatusLoaded) {
const dictionarySymbolStyleConfigurations = dictionarySymbolStyle.configurations;
for ( let i = 0 ; i < dictionarySymbolStyleConfigurations.length; i++) {
if (dictionarySymbolStyleConfigurations[i].name === "model" ) {
dictionarySymbolStyleConfigurations[i].value = "ORDERED ANCHOR POINTS" ;
}
}
}
});
}
}
}
//! [Apply Dictionary Renderer Graphics Overlay QML]
}
ProgressBar {
id: progressBar_loading
anchors {
horizontalCenter : parent .horizontalCenter
bottom : parent .bottom
margins : 5
}
indeterminate : true
visible : !graphicsLoaded
}
XmlParser {
id: xmlParser
onXmlParseComplete : (parsedXml) => {
parsedXml.forEach(element => {createGraphicFromElement(element)});
graphicsLoaded = true ;
}
}
function createGraphicFromElement ( element ) {
let wkid = element._wkid;
if (!wkid) {
// If _wkid was absent, use WGS 1984 (4326) by default.
wkid = 4326 ;
}
const pointStrings = element._control_points.split( ";" );
const sr = ArcGISRuntimeEnvironment.createObject( "SpatialReference" , { wkid : wkid });
let geom;
if (pointStrings.length === 1 ) {
// It's a point
const pointBuilder = ArcGISRuntimeEnvironment.createObject( "PointBuilder" );
pointBuilder.spatialReference = sr;
const coords = pointStrings[ 0 ].split( "," );
pointBuilder.setXY(coords[ 0 ], coords[ 1 ]);
geom = pointBuilder.geometry;
} else {
const builder = ArcGISRuntimeEnvironment.createObject( "MultipointBuilder" );
builder.spatialReference = sr;
for ( let ptIndex = 0 ; ptIndex < pointStrings.length; ptIndex++) {
const coords = pointStrings[ptIndex].split( "," );
builder.points.addPointXY(coords[ 0 ], coords[ 1 ]);
}
geom = builder.geometry;
}
if (geom) {
const graphic = ArcGISRuntimeEnvironment.createObject( "Graphic" , { geometry : geom });
graphic.attributes.attributesJson = {
"identity" : element.identity,
"symbolset" : element.symbolset,
"symbolentity" : element.symbolentity,
"echelon" : element.echelon,
"specialentitysubtype" : element.specialentitysubtype,
"indicator" : element.indicator,
"modifier2" : element.modifier2,
"uniquedesignation" : element.uniquedesignation,
"additionalinformation" : element.additionalinformation
};
graphicsOverlay.graphics.append(graphic);
}
}
}