1. Confirmation of qt version and QtLocation module version
If the qt version is too low, there is no QtLocation module. My version is as follows.
The build tool version is as follows.
2. Writing qml code
1. Add modules to the project
First add the module to the projectquickwidgets positioning location
2. Add resource files
3. Add the qml file to the resource file
4. Writing qml code
import QtQuick
import QtLocation
import QtPositioning
import QtQuick.Controls
Rectangle {
width: parent
height: parent
visible: true
Control{
id:labelcpp
objectName: 'labelcpp'
font.pointSize: 38
property real latitudeSave: 22.64018
property real longitudeSave: 113.92746
//cpp调用这个函数
function getText()
{
return map.center + " zoom " + map.zoomLevel.toFixed(3)
+ " min " + map.minimumZoomLevel + " max " + map.maximumZoomLevel
}
function setCoordinate(latitude,longitude)
{
latitudeSave = latitude
longitudeSave = longitude
map.center.latitude = latitude
map.center.longitude = longitude
map.update()
console.log("latitude="+latitude+" longitude="+longitude);
}
}
Plugin {
id: mapPlugin
name: "osm"
// PluginParameter { name: "osm.mapping.providersrepository.address"; value: "http://www.mywebsite.com/osm_repository" }
// PluginParameter { name: "osm.mapping.highdpi_tiles"; value: true }
}
Map {
id: map
anchors.fill: parent
plugin: mapPlugin
center: QtPositioning.coordinate(22.64018, 113.92746) // Oslo
zoomLevel: 14
property geoCoordinate startCentroid
PinchHandler {
id: pinch
target: null
onActiveChanged: if (active) {
map.startCentroid = map.toCoordinate(pinch.centroid.position, false)
}
onScaleChanged: (delta) => {
map.zoomLevel += Math.log2(delta)
map.alignCoordinateToPoint(map.startCentroid, pinch.centroid.position)
}
onRotationChanged: (delta) => {
map.bearing -= delta
map.alignCoordinateToPoint(map.startCentroid, pinch.centroid.position)
}
grabPermissions: PointerHandler.TakeOverForbidden
}
WheelHandler {
id: wheel
// workaround for QTBUG-87646 / QTBUG-112394 / QTBUG-112432:
// Magic Mouse pretends to be a trackpad but doesn't work with PinchHandler
// and we don't yet distinguish mice and trackpads on Wayland either
acceptedDevices: Qt.platform.pluginName === "cocoa" || Qt.platform.pluginName === "wayland"
? PointerDevice.Mouse | PointerDevice.TouchPad
: PointerDevice.Mouse
rotationScale: 1/120
property: "zoomLevel"
}
DragHandler {
id: drag
target: null
onTranslationChanged: (delta) => map.pan(-delta.x, -delta.y)
}
Shortcut {
enabled: map.zoomLevel < map.maximumZoomLevel
sequence: StandardKey.ZoomIn
onActivated: map.zoomLevel = Math.round(map.zoomLevel + 1)
}
Shortcut {
enabled: map.zoomLevel > map.minimumZoomLevel
sequence: StandardKey.ZoomOut
onActivated: map.zoomLevel = Math.round(map.zoomLevel - 1)
}
Component.onCompleted: {
map.addMapItem(circle)
}
}
MapCircle {
id: circle
center: QtPositioning.coordinate(labelcpp.latitudeSave,labelcpp.longitudeSave)
radius: 50
border.width: 5
//鼠标按住后可移动
MouseArea {
anchors.fill: parent
drag.target: parent
}
}
}
ControlIt is used for data interaction with C++. By setCoordinatesending coordinates and fixing a point on the map, getTextit is used to obtain the midpoint of the map and the map zoom level.
5. Interact with c++ to send coordinate points
void MainWindow::on_pushButton_clicked()
{
QQuickItem *root = ui->quickWidget->rootObject();//拿到所有对象的列表
auto labelqml = root->findChild<QObject*>("labelcpp");//名字要与main.qml中的 objectName: 'labelcpp' 相同
QVariant ret;
QMetaObject::invokeMethod(labelqml, "setCoordinate", Q_ARG(QVariant, 22.65599), Q_ARG(QVariant, 113.92576));
qDebug() << ret.toString();
}
3. Effect display
