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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
Pan and zoom to explore military symbols on the map.
How it works
Create a new DictionarySymbolStyle(dictionaryPath)
.
Create a new DictionaryRenderer(symbolDictionary)
.
Create a new GraphicsOverlay
Set the dictionary renderer to the graphics overlay.
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 spatial reference and shape 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.cpp GODictionaryRenderer.cpp GODictionaryRenderer.h GODictionaryRenderer.qml
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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]
# ifdef PCH_BUILD
# include "pch.hpp"
# endif // PCH_BUILD
# include "GODictionaryRenderer.h"
# include "DictionaryRenderer.h"
# include "GraphicListModel.h"
# include "Map.h"
# include "MapQuickView.h"
# include "MultipointBuilder.h"
# include "DictionarySymbolStyle.h"
# include "DictionarySymbolStyleConfiguration.h"
# include "MapTypes.h"
# include "GraphicsOverlayListModel.h"
# include "PointCollection.h"
# include "TaskWatcher.h"
# include "GraphicsOverlay.h"
# include "SpatialReference.h"
# include "Point.h"
# include "Graphic.h"
# include <QtCore/qglobal.h>
# include <QFile>
# include <QStandardPaths>
using namespace Esri::ArcGISRuntime;
// helper method to get cross platform data path
namespace
{
QString defaultDataPath ()
{
QString dataPath;
# ifdef Q_OS_IOS
dataPath = QStandardPaths:: writableLocation (QStandardPaths::DocumentsLocation);
# else
dataPath = QStandardPaths:: writableLocation (QStandardPaths::HomeLocation);
# endif
return dataPath;
}
} // namespace
const QString GODictionaryRenderer::FIELD_CONTROL_POINTS = QStringLiteral ( "_control_points" );
const QString GODictionaryRenderer::FIELD_WKID = QStringLiteral ( "_wkid" );
GODictionaryRenderer:: GODictionaryRenderer (QQuickItem* parent) :
QQuickItem (parent),
m_dataPath ( defaultDataPath () + "/ArcGIS/Runtime/Data" )
{
}
GODictionaryRenderer::~ GODictionaryRenderer () = default ;
void GODictionaryRenderer::init ()
{
qmlRegisterType<MapQuickView>( "Esri.Samples" , 1 , 0 , "MapView" );
qmlRegisterType<GODictionaryRenderer>( "Esri.Samples" , 1 , 0 , "GODictionaryRendererSample" );
}
bool GODictionaryRenderer::graphicsLoaded () const
{
return m_graphicsLoaded;
}
void GODictionaryRenderer::componentComplete ()
{
QQuickItem:: componentComplete ();
//! [Apply Dictionary Renderer Graphics Overlay Cpp]
// Create graphics overlay
m_graphicsOverlay = new GraphicsOverlay ( this );
// Create dictionary renderer and apply to the graphics overlay
const QString specType = QStringLiteral ( "mil2525d" );
const QString styleLocation = m_dataPath + "/styles/arcade_style/mil2525d.stylx" ;
DictionarySymbolStyle* dictionarySymbolStyle = DictionarySymbolStyle:: createFromFile (styleLocation, this );
// The style will be loaded automatically
connect (dictionarySymbolStyle, &DictionarySymbolStyle::loadStatusChanged, this , [dictionarySymbolStyle]()
{
if (dictionarySymbolStyle-> loadStatus () == LoadStatus::Loaded)
{
const QList<DictionarySymbolStyleConfiguration*> dictionarySymbolStyleConfigurations = dictionarySymbolStyle-> configurations ();
for (DictionarySymbolStyleConfiguration* dictionarySymbolStyleConfiguration : dictionarySymbolStyleConfigurations)
{
if (dictionarySymbolStyleConfiguration-> name () == "model" )
{
dictionarySymbolStyleConfiguration-> setValue ( "ORDERED ANCHOR POINTS" );
}
}
}
});
//! [Apply Dictionary Renderer Graphics Overlay Cpp]
Q_UNUSED (specType)
DictionaryRenderer* renderer = new DictionaryRenderer (dictionarySymbolStyle, this );
m_graphicsOverlay-> setRenderer (renderer);
// Create a map and give it to the MapView
m_mapView = findChild<MapQuickView*>( "mapView" );
m_map = new Map (BasemapStyle::ArcGISTopographic, this );
parseXmlFile ();
m_mapView-> graphicsOverlays ()-> append (m_graphicsOverlay);
// The GraphicsOverlay will not have a valid extent until it is part of
// a MapQuickView with a valid spatial referenence
connect (m_mapView, &MapQuickView::spatialReferenceChanged, this , [ this ]()
{
zoomToGraphics ();
});
m_mapView-> setMap (m_map);
}
void GODictionaryRenderer::parseXmlFile ()
{
bool readingMessage = false ;
QVariantMap elementValues;
QString currentElementName;
QFile xmlFile (m_dataPath + "/xml/arcade_style/Mil2525DMessages.xml" ) ;
// Open the file for reading
if (xmlFile. isOpen ())
{
xmlFile. reset ();
}
else
{
xmlFile. open (QIODevice::ReadOnly | QIODevice::Text);
}
m_xmlParser. setDevice (&xmlFile);
// Traverse the XML in a loop
while (!m_xmlParser. atEnd ())
{
m_xmlParser. readNext ();
// Is this the start or end of a message element?
if (m_xmlParser. name () == QString ( "message" ))
{
if (!readingMessage)
{
// This is the start of a message element.
elementValues. clear ();
}
else
{
// This is the end of a message element. Here we have a complete message that defines
// a military feature to display on the map. Create a graphic from its attributes.
createGraphic (elementValues);
}
// Either we just started reading a message, or we just finished reading a message.
readingMessage = !readingMessage;
}
// Are we already inside a message element?
else if (readingMessage)
{
// Is this the start of an element inside a message?
if (m_xmlParser. isStartElement ())
{
// Remember which element we're reading
currentElementName = m_xmlParser. name (). toString ();
}
// Is this text?
else if (m_xmlParser. isCharacters ())
{
// Is this text inside an element?
if (!currentElementName. isEmpty ())
{
// Get the text and store it as the current element's value
const QStringView trimmedText = m_xmlParser. text (). trimmed ();
if (!trimmedText. isEmpty ())
{
elementValues[currentElementName] = trimmedText. toString ();
}
}
}
}
}
emit graphicsLoadedChanged () ;
}
void GODictionaryRenderer::createGraphic (QVariantMap rawAttributes)
{
// If _wkid was absent, use WGS 1984 (4326) by default.
const int wkid = rawAttributes. count (FIELD_WKID) > 0 ? rawAttributes[FIELD_WKID]. toInt () : 4326 ;
const SpatialReference sr (wkid) ;
const QStringList pointStrings = rawAttributes[FIELD_CONTROL_POINTS]. toString (). split ( ";" );
Geometry geom;
if (pointStrings. length () == 1 )
{
// It's a point
const QStringList coords = pointStrings[ 0 ]. split ( "," );
geom = Point (coords[ 0 ]. toDouble (), coords[ 1 ]. toDouble (), sr);
}
else {
// It's a multipoint
MultipointBuilder* builder = new MultipointBuilder (sr, this );
PointCollection* collection = new PointCollection (sr, this );
for ( const QString& pointString : pointStrings)
{
const QStringList coords = pointString. split ( "," );
if (coords. length () >= 2 )
collection-> addPoint (coords[ 0 ]. toDouble (), coords[ 1 ]. toDouble ());
}
builder-> setPoints (collection);
geom = builder-> toGeometry ();
}
if (!geom. isEmpty ())
{
// Get rid of _control_points and _wkid. They are not needed in the graphic's
// attributes.
rawAttributes. remove (FIELD_CONTROL_POINTS);
rawAttributes. remove (FIELD_WKID);
Graphic* graphic = new Graphic (geom, rawAttributes, this );
m_graphicsOverlay-> graphics ()-> append (graphic);
}
}
void GODictionaryRenderer::zoomToGraphics ()
{
if (m_graphicsOverlay)
m_mapView-> setViewpointGeometry (m_graphicsOverlay-> extent (), 20 );
}