- Qt 5.15
- Qt Location
- Qt Location Items Overlay Plugin
- Qt 5.15.16 Reference Documentation

# Qt Location Items Overlay Plugin

## Overview

This geo services plugin is a special plugin providing only an empty map. This plugin provides no services, and is intended to be used in those cases where a Map element should only show the added map items.

The Items Overlay geo services plugin can be loaded by using the plugin key "itemsoverlay".

## Example usage

The following snippet shows how a Map using this plugin can be added as an overlay to display anti-aliased map items. Note that for such an overlay Map to be transparent, it is also necessary to set its color to a transparent one, such as transparent, like in the example.

     Window {
         id: win
         visible: true
         width: 640
         height: 640

         Map {
             id: mapBase
             gesture.enabled: true
             anchors.fill: parent
             plugin: Plugin { name: "osm" }
             center: QtPositioning.coordinate(45,10)
             zoomLevel: 4
             z: parent.z + 1
         }

         Map {
             id: mapOverlay
             anchors.fill: parent
             plugin: Plugin { name: "itemsoverlay" }
             gesture.enabled: false
             center: mapBase.center
             color: 'transparent' // Necessary to make this map transparent
             minimumFieldOfView: mapBase.minimumFieldOfView
             maximumFieldOfView: mapBase.maximumFieldOfView
             minimumTilt: mapBase.minimumTilt
             maximumTilt: mapBase.maximumTilt
             minimumZoomLevel: mapBase.minimumZoomLevel
             maximumZoomLevel: mapBase.maximumZoomLevel
             zoomLevel: mapBase.zoomLevel
             tilt: mapBase.tilt;
             bearing: mapBase.bearing
             fieldOfView: mapBase.fieldOfView
             z: mapBase.z + 1

             MapCircle {
                 id: circle
                 center: QtPositioning.coordinate(44, 10)
                 radius: 200000
                 border.width: 5

                 MouseArea {
                     anchors.fill: parent
                     drag.target: parent
                 }
             }

             // The code below enables SSAA
             layer.enabled: true
             layer.smooth: true
             property int w : mapOverlay.width
             property int h : mapOverlay.height
             property int pr: Screen.devicePixelRatio
             layer.textureSize: Qt.size(w  * 2 * pr, h * 2 * pr)
         }
     }