Qt Location 项目叠加插件

概述

此地理服务插件是一个仅提供空白地图的特殊插件。该插件不提供任何服务，旨在用于那些需要让 `Map ` 元素仅显示已添加地图项的情况。

可通过插件键“itemsoverlay”加载“项目叠加”地理服务插件。

使用示例

以下代码片段演示了如何将使用此插件的地图作为叠加层添加，以显示经过抗锯齿处理的地图项。请注意，要使此类叠加层地图具有透明效果，还需将其颜色设置为透明色（如示例中的“transparent”）。

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

    Map {
        id: mapBase
        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" }
        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)
    }
}

OpenStreetMap 插件从 Qt 5 升级

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