Map

Map

😅 (difficulty)	⌛ (time-Box)	🔗 (related to)
3️⃣ / 5️⃣	60 - 90 mn	Location, Positioning

Get to know all about maps in QML :

• control the map : type, center position, zoom
• add all type of marker elements to the map
• query the map services about specific element
• ..

✔️ primary objectives

Piece of cake

• Select a location services provider
• Add a map

Easy

• Set the map to the device current position
• control the map properties : tilt, rotation, zoom level
• change the map type
• position a filled cercle at a given location : try to set a fixed "world" size (i.e 100m) or a fixed screen size.

Normal

• when clicking on the map, an image item should be set related to the position corresponding to the mouse clik (for instance 250m to the east)
• Dynamical creation of marker (as a rectangle, an image or anything else you want) : each time one click on the map a marker is created, when clicking on an existing marker it gets deleted

💰 useful ressources

• Unesco "world heritage" web service

👶 Newbies area

Warning : Spoilers !!!

QML types	Module	Useful for...
Plugin	Location	service provider : "osm", "here","esri"...
Map	Location	Display a map using a given plugin
PositionSource	Positioning	give your position
MapCircle	Location	A circle marker to position on your map
MapQuickItem	Location	A map container to position any item on your map
MapItemView	Location	A view to position items on your map
GeocodeModel	Location	will give you the coordinate of an address
PlaceSearchModel	Location	A geo queryable model providing items matching your searchTerm in the given searchArea
RouteQuery RouteModel	Location	create a navigation query

ℹ️ useful information and hints

• use QtPositioning.coordinate to create a coordinate object from a given position
• use atDistanceAndAzimuth to create a coordinate relative to another
• use supportedMapTypes property to get the list of map type supported and activeMapType to select : activeMapType = supportedMapTypes[0]
• XmlListModel is very handy to display the content of a georss.

    XmlListModel {
        namespaceDeclarations: "declare namespace geo='http://www.w3.org/2003/01/geo/wgs84_pos#';"
        source: "http://whc.unesco.org/en/list/georss/"
        query: "/rss/channel/item"
        XmlRole { name: "title"; query: "title/string()" }
        XmlRole { name: "description"; query: "description/string()" }
        XmlRole { name: "lat"; query: "geo:lat/string()" }
        XmlRole { name: "long"; query: "geo:long/string()" }
    }

⚠️ cautions and warnings

• check services provider limitations about free plan / features

secondary objectives (only for the braves 🏆 )

very difficult

• place a picture for every restaurants around us within 2km
• Geocode/reverse geocode each time a marker is clicked, display its address and position

Nightmare

• display the navigation from your current position to a selected POI

God mode

• Show the unesco world heritage on a map, for every entry display the picture and the description