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Use pictures for markers.
Use case
When marking geoelements on a map, using custom, unique symbols can be helpful for highlighting and differentiating between locations. For example, a tourism office may use pictures of landmarks as symbols on an online map or app, to help prospective visitors to orient themselves more easily around a city.
How to use the sample
When launched, this sample displays a map with three picture marker symbols. Pan and zoom to explore the map.
How it works
Create a PictureMarkerSymbol using the URL to an online or local image.
Create a Graphic and set its symbol to the picture marker symbol.
Relevant API
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 picture marker symbols in this sample are all constructed from different types of resources:
Campsite symbol constructed from a URL Blue pin with a star stored in the resource folder that comes with the application
Orange pin created from a file path on disk (which is written to disk when the app starts and cleaned up when the app closes).
graphics, marker, picture, symbol, visualization
Picture_Marker_Symbol.cpp Picture_Marker_Symbol.cpp Picture_Marker_Symbol.h Picture_Marker_Symbol.qml
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// [WriteFile Name=Picture_Marker_Symbol, 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 "Picture_Marker_Symbol.h"
# include "Map.h"
# include "Point.h"
# include "Graphic.h"
# include "Viewpoint.h"
# include "MapQuickView.h"
# include "GraphicsOverlay.h"
# include "SpatialReference.h"
# include "PictureMarkerSymbol.h"
# include "MapTypes.h"
# include "MapViewTypes.h"
# include "GraphicsOverlayListModel.h"
# include "GraphicListModel.h"
# include "Envelope.h"
# include <QUrl>
# include <QString>
# include <QtCore/qglobal.h>
# 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
Picture_Marker_Symbol:: Picture_Marker_Symbol (QQuickItem* parent) :
QQuickItem (parent),
m_dataPath ( defaultDataPath () + "/ArcGIS/Runtime/Data" )
{
}
Picture_Marker_Symbol::~ Picture_Marker_Symbol () = default ;
void Picture_Marker_Symbol::init ()
{
qmlRegisterType<MapQuickView>( "Esri.Samples" , 1 , 0 , "MapView" );
qmlRegisterType<Picture_Marker_Symbol>( "Esri.Samples" , 1 , 0 , "Picture_Marker_SymbolSample" );
}
void Picture_Marker_Symbol::componentComplete ()
{
QQuickItem:: componentComplete ();
// find QML MapView component
m_mapView = findChild<MapQuickView*>( "mapView" );
m_mapView-> setWrapAroundMode (WrapAroundMode::Disabled);
// Create a map using the topographic basemap
m_map = new Map (BasemapStyle::ArcGISTopographic, this );
// Set map to map view
m_mapView-> setMap (m_map);
// set initial viewpoint
m_map-> setInitialViewpoint ( Viewpoint ( Envelope ( -229100 , 6550700 , -223300 , 6552100 , SpatialReference:: webMercator ())));
// create graphics overlay
m_graphicsOverlay = new GraphicsOverlay ( this );
// create a campsite symbol from a URL
PictureMarkerSymbol* campSymbol = new PictureMarkerSymbol ( QUrl ( "https://static.arcgis.com/images/Symbols/OutdoorRecreation/Camping.png" ), this );
setWidthAndHeight (campSymbol, 38.0f );
Point campPoint ( -228835 , 6550763 , SpatialReference::webMercator()) ;
addGraphic (campPoint, campSymbol);
// create a blue symbol from a local resource
PictureMarkerSymbol* blueSymbol = new PictureMarkerSymbol ( QUrl ( "qrc:/Samples/DisplayInformation/Picture_Marker_Symbol/blue_symbol.png" ), this );
setWidthAndHeight (blueSymbol, 80.0f );
Point blueSymbolPoint ( -223560 , 6552021 , SpatialReference::webMercator()) ;
addGraphic (blueSymbolPoint, blueSymbol);
// create an orange symbol from a file path
PictureMarkerSymbol* orangeSymbol = new PictureMarkerSymbol ( QUrl (m_dataPath + "/symbol/orange_symbol.png" ), this );
setWidthAndHeight (orangeSymbol, 64.0f );
Point orangeSymbolPoint ( -226773 , 6550477 , SpatialReference::webMercator()) ;
addGraphic (orangeSymbolPoint, orangeSymbol);
// add GraphicsOverlay to MapView
m_mapView-> graphicsOverlays ()-> append (m_graphicsOverlay);
}
void Picture_Marker_Symbol::addGraphic (Point &point, PictureMarkerSymbol* symbol)
{
// create graphic
Graphic* graphic = new Graphic (point, symbol, this );
// append to graphicsoverlay
m_graphicsOverlay-> graphics ()-> append (graphic);
}
void Picture_Marker_Symbol::setWidthAndHeight (PictureMarkerSymbol* symbol, float size)
{
symbol-> setWidth (size);
symbol-> setHeight (size);
}
