QtLocation.MapQuickItem

The MapQuickItem type displays an arbitrary Qt Quick object on a Map. More...

Properties

• anchorPoint : QPointF
• coordinate : coordinate
• sourceItem : object
• zoomLevel : real

Detailed Description

The MapQuickItem will follow the panning (and optionally, the zooming) of the Map as if it is on the Map surface.

The sourceItem property contains the Qt Quick item to be drawn, which can be any kind of visible type.

Positioning and Sizing

The positioning of the coordinate is set, it specifies a longitude/latitude coordinate for the item to be placed at. The set coordinate will line up with the top-left corner of the contained item when shown on the screen.

The coordinate when displayed.

In addition to being anchored to the map, the zoomLevel is not set is for the item to be drawn "on the screen" rather than "on the map", so that its size remains the same regardless of the zoom level of the Map.

Performance

Performance of a MapQuickItem is normally in the same ballpark as the contained Qt Quick item alone. Overheads added amount to a translation and (possibly) scaling of the original item, as well as a transformation from longitude and latitude to screen position.

Limitations

Note: Due to an implementation detail, items placed inside a MapQuickItem by its id, and avoid the use of anchor in the sourceItem.

Example Usage

The following snippet shows a MapQuickItem containing an Image object, to display a Marker on the Map. This strategy is used to show the map markers in the MapViewer example.

MapQuickItem {
id: marker
anchorPoint.x: image.width/4
anchorPoint.y: image.height
sourceItem: Image {
id: image
}
}

src="https://assets.ubuntu.com/v1/fe21dbdf-api-mapquickitem.png" alt="" />

Property Documentation

This property determines which point on the sourceItem that will be lined up with the coordinate on the map.