How to use transitions together with MapItemView .
MapItemView 过渡 演示如何使用 Map item to render a map. It shows the minimum amount of code needed to display the map, and can be used as a basis for further experimentation.
要运行范例从 Qt Creator ,打开 欢迎 模式,然后选择范例从 范例 。更多信息,拜访 构建和运行范例 .
在
main.qml
, two
MapItemView
elements are used, to add to the map the administrative districts for the Oslo region, and to add a marker upon long-press.
MapItemView { id: mivMarker add: Transition { NumberAnimation { property: "slideIn" from: 50 to: 0 duration: 500 easing.type: Easing.OutBounce easing.amplitude: 3.0 } } remove: Transition { NumberAnimation { property: "opacity" to: 0.1 duration: 50 } } model: ListModel { id: markerModel } delegate: Component { MapQuickItem { coordinate: QtPositioning.coordinate(latitude, longitude) anchorPoint: Qt.point(e1.width * 0.5, e1.height + slideIn) property real slideIn : 0 sourceItem: Shape { id: e1 vendorExtensionsEnabled: false width: 32 height: 32 visible: true transform: Scale { origin.y: e1.height * 0.5 yScale: -1 } ShapePath { id: c_sp1 strokeWidth: -1 fillColor: Qt.rgba(1,0,1,1.0) property real half: e1.width * 0.5 property real quarter: e1.width * 0.25 property point center: Qt.point(e1.x + e1.width * 0.5 , e1.y + e1.height * 0.5) property point top: Qt.point(center.x, center.y - half ) property point bottomLeft: Qt.point(center.x - half, center.y + half ) property point bottomRight: Qt.point(center.x + half, center.y + half ) startX: center.x; startY: center.y + half PathLine { x: c_sp1.bottomLeft.x; y: c_sp1.bottomLeft.y } PathLine { x: c_sp1.top.x; y: c_sp1.top.y } PathLine { x: c_sp1.bottomRight.x; y: c_sp1.bottomRight.y } PathLine { x: c_sp1.center.x; y: c_sp1.center.y + c_sp1.half } } } } } }
The marker view specifies both the add and the remove transition, to create a bouncing marker effect.
MapItemView { id: miv model: OsloListModel { id: osloListModel } add: Transition { NumberAnimation { property: "animationScale" from: 0.2 to: 1 duration: 800 easing.type: Easing.OutCubic } } delegate: Component { MapPolygon { function fromMercator(l, centroid) { var res = [] for (var i = 0; i < l.length; i++) { var vtx = l[i] var offset = Qt.point((vtx.x - centroid.x) * animationScale, (vtx.y - centroid.y) * animationScale) var pt = Qt.point(centroid.x + offset.x, centroid.y + offset.y) res.push( QtPositioning.mercatorToCoord(pt) ) } return res; } path: fromMercator(osloListModel.geometries[name+"_"+adminLevel] , osloListModel.centroids[name+"_"+adminLevel] ) color: ((adminLevel > 4) ? "lightsteelblue" : 'firebrick') property real animationScale : 1 opacity: ((adminLevel < 9) ? 0.1 : 0.8) visible: true } } }
The administrative districts view specifies only the add transition, to create a district growing effect.
The example requires a working internet connection to download
OpenStreetMap
map tiles. An optional system proxy should be picked up automatically.