大家好,这是我在这个网站上的第一篇文章,我正在使用Ionic中的应用程序,当你按下按钮时用标记显示你的位置,你可以再次推动它来更新你的位置并在那个位置添加一个Marker,我想要在这些标记之间绘制折线,但我还没有成功。我知道有一些绘制折线的方法我的想法是提取标记的纬度,长坐标,将它们保存在一个数组中然后将其设置为绘制折线的“路径”但是我在创建时遇到问题数组如下面的评论。这是我的代码:
import { Component, ViewChild, ElementRef } from '@angular/core';
import { NavController} from 'ionic-angular';
import { Geolocation } from '@ionic-native/geolocation';
declare var google;
@Component({
selector: 'home-page',
templateUrl: 'home.html'
})
export class HomePage {
@ViewChild('map') mapElement: ElementRef;
map: any;
me: any;
markers=[];
lat=[];
long=[];
constructor(public navCtrl: NavController, public geolocation: Geolocation) {
}
ionViewDidLoad(){
this.loadMap();
}
loadMap() {
this.geolocation.getCurrentPosition().then((position) => {
let mylatLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
let mapOptions = {
center: mylatLng,
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);
},
(err) => {
console.log(err);
});
}
addMarker(){
let marker = new google.maps.Marker({
map: this.map,
animation: google.maps.Animation.DROP,
});
let content = '<p>Posición: ' + marker.setPosition() + '</p>'
if (navigator.geolocation) navigator.geolocation.getCurrentPosition(function(pos) {
var me = new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude);
marker.setPosition(me);
},
function(error) {
// ...
});
this.markers.push(marker);
this.addInfoWindow(marker, content);
}
addInfoWindow(marker, content){
let infoWindow = new google.maps.InfoWindow({
content: content
});
if (navigator.geolocation) navigator.geolocation.getCurrentPosition(function(pos) {
var me = new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude);
infoWindow.setContent('<p>Posición: ' + me + '</p>')
},
function(error) {
// ...
});
google.maps.event.addListener(marker, 'click', () => {
infoWindow.open(this.map, marker);
});
}
setMapAll(map) {
for (var i = 0; i < this.markers.length; i++) {
this.markers[i].setMap(map);
}
}
clearMarkers() {
this.setMapAll(null);
}
deleteMarkers() {
this.clearMarkers();
this.markers = [];
}
// Im having problems here
addPolyLine() {
var poly = new Array();
for (var j=0; j<this.lat.length;j++){
var pos= new google.maps.LatLng(this.lat[j],this.long[j])
poly.push(pos);
}
var flightPath = new google.maps.Polyline({
path: poly,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(this.map);
}
}
和HTML页面:
<ion-header>
<ion-navbar>
<ion-title>
MapaPrueba
</ion-title>
<ion-buttons end>
<button ion-button (click)="addMarker()"><ion-icon name="add"></ion-icon>Agregar Pos</button>
</ion-buttons>
</ion-navbar>
</ion-header>
<ion-content>
<div #map id="map"></div>
<ion-fab left bottom>
<button ion-fab color="light" (click)="clearMarkers()">
<ion-icon name="eye-off"></ion-icon>
</button>
</ion-fab>
</ion-content>
官方文档中有一个full example,下面也是如此。
总之,你必须:
getPath()
方法获取折线路径var map;
var polyLine;
var polyOptions;
function initialize() {
var mapOptions = {
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: new google.maps.LatLng(0,0)
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
polyOptions = {
strokeColor: '#0026b3',
strokeOpacity: 1.0,
strokeWeight: 1,
geodesic: true,
}
polyLine = new google.maps.Polyline(polyOptions);
polyLine.setMap(map);
google.maps.event.addListener(map, 'click', function(event) {
addPoint(event);
});
}
function addPoint(event) {
var path = polyLine.getPath();
path.push(event.latLng);
var marker = new google.maps.Marker({
position: event.latLng,
map: map,
});
map.setCenter(event.latLng);
}
initialize();
#map-canvas {
height: 200px;
}
<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>