Javascript Google Maps JS API v3-如何检查和显示多边形点之间的距离
我使用谷歌地图API允许用户在地图上绘制自定义多边形。我需要检查并显示每个边框的长度 我已经使用几何体库和地图标签库来获取和显示多边形的计算面积(在“insert_at”和“set_at”事件中也会发生更改),但不幸的是,我不知道如何获取边界长度。任何帮助都将不胜感激 使用的代码示例:Javascript Google Maps JS API v3-如何检查和显示多边形点之间的距离,javascript,google-maps-api-3,Javascript,Google Maps Api 3,我使用谷歌地图API允许用户在地图上绘制自定义多边形。我需要检查并显示每个边框的长度 我已经使用几何体库和地图标签库来获取和显示多边形的计算面积(在“insert_at”和“set_at”事件中也会发生更改),但不幸的是,我不知道如何获取边界长度。任何帮助都将不胜感激 使用的代码示例: var labels = []; var allOverlays = []; function setSelection(shape) { selectedShape = shape; shape.s
var labels = [];
var allOverlays = [];
function setSelection(shape) {
selectedShape = shape;
shape.setEditable(true);
}
function initMap() {
var options = {
zoom: 14,
center: {lat: 52.250618, lng: 20.9774}
}
var map = new google.maps.Map(document.getElementById('map'), options);
var drawingManager = new google.maps.drawing.DrawingManager({
markerOption: {
draggable: false
},
polygonOptions: {
draggable: false,
fillColor: '#5C6BC0',
fillOpacity: 0.45,
strokeWeight: 0,
editable: true,
zIndex: 1
},
drawingControl: true,
drawingControlOptions: {
position: google.maps.ControlPosition.TOP_CENTER,
drawingModes: ['circle', 'polygon']
},
circleOptions: {
fillColor: '#5C6BC0',
fillOpacity: 0.45,
strokeWeight: 0,
editable: true,
zIndex: 1
},
map: map
});
function attachPolygonInfoWindow(polygon) {
var path = polygon.getPath();
var points = path.getArray();
var area = (google.maps.geometry.spherical.computeArea(path.getArray())).toFixed(0);
var bounds = new google.maps.LatLngBounds();
var i;
for (i = 0; i < points.length; i++) {
bounds.extend(points[i]);
}
var boundsCenter = bounds.getCenter();
var mapLabel = new MapLabel({
map: map,
fontSize: 20,
align: 'left'
});
if (!labels.length) {
labels.push(mapLabel)
}
showPolygonInfoWindow(labels, boundsCenter, area);
}
function showPolygonInfoWindow(arr, position, text) {
arr.forEach((el) => {
el.set('position', position);
el.set('text', text + 'm2')
})
}
function removePolygonInfoWindow() {
for (var i = 0; i < labels.length; i++) {
labels[i].setMap(null);
}
labels = [];
}
google.maps.event.addListener(drawingManager, 'overlaycomplete', function(e) {
allOverlays.push(e);
if (e.type != google.maps.drawing.OverlayType.MARKER) {
drawingManager.setDrawingMode(null);
var newShape = e.overlay;
newShape.type = e.type;
google.maps.event.addListener(newShape, 'click', function() {
setSelection(newShape);
});
if (newShape.type == "polygon") {
var path = newShape.getPath();
google.maps.event.addListener(path, 'insert_at', function() {
attachPolygonInfoWindow(newShape);
});
google.maps.event.addListener(path, 'set_at', function() {
attachPolygonInfoWindow(newShape);
});
attachPolygonInfoWindow(newShape);
}
setSelection(newShape);
}
});
}
initMap();
<script src="https://maps.google.com/maps/api/js?sensor=false&libraries=drawing,geometry">
</script>
<script type="text/javascript" src="https://cdn.rawgit.com/googlemaps/js-map-label/gh-pages/src/maplabel.js"></script>
var标签=[];
var allOverlays=[];
功能选择(形状){
selectedShape=形状;
shape.setEditable(true);
}
函数initMap(){
变量选项={
缩放:14,
中心:{lat:52.250618,lng:20.9774}
}
var map=new google.maps.map(document.getElementById('map'),options);
var drawingManager=new google.maps.drawing.drawingManager({
标记选项:{
可拖动:错误
},
多克隆选择:{
可拖动:错误,
填充颜色:“#5C6BC0”,
填充不透明度:0.45,
冲程重量:0,
是的,
zIndex:1
},
drawingControl:对,
drawingControlOptions:{
位置:google.maps.ControlPosition.TOP_CENTER,
绘图模式:[“圆”、“多边形”]
},
循环操作:{
填充颜色:“#5C6BC0”,
填充不透明度:0.45,
冲程重量:0,
是的,
zIndex:1
},
地图:地图
});
函数AttachPolygonInfo窗口(多边形){
var path=polygon.getPath();
var points=path.getArray();
var area=(google.maps.geometry.sphereal.computeArea(path.getArray()).toFixed(0);
var bounds=new google.maps.LatLngBounds();
var i;
对于(i=0;i{
el.set(“位置”,位置);
标高集('text',text+'m2')
})
}
函数removePolygonInfoWindow(){
对于(变量i=0;i
我想在每个边框的侧面显示每个边框的长度。我的建议是,在创建中心标签时,还要处理多边形的路径,计算它们的长度和中心;然后为每个对象创建
MapLabel
对象,并将其放置在侧面的中心。比如:
for (var i=0; i<polygon.getPath().getLength(); i++) {
// for each side in path, compute center and length
var start = polygon.getPath().getAt(i);
var end = polygon.getPath().getAt(i<polygon.getPath().getLength()-1 ? i+1 : 0);
var sideLength = google.maps.geometry.spherical.computeDistanceBetween(start,end);
var sideCenter = google.maps.geometry.spherical.interpolate(start, end, 0.5);
var sideLabel = new MapLabel({
map: map,
fontSize: 20,
align: "center"
});
sideLabel.set("position", sideCenter);
sideLabel.set("text", sideLength.toFixed(2)+"m");
polygon.labels.push(sideLabel);
}