[英]Google Maps APi3: Polyline segments not appearing on map
咕咕天!
我有一个非常简单的Google地图实现,它允许我的用户在地图画布上的任意位置绘制折线。
重新开始时,折线段在地图上可见,折线使用PHP存储在mySql数据库中。
//使用折线编辑地图时:
如果用户决定更改折线,我将从数据库中加载上一条折线,并且该线对用户可见。 当他们单击按钮绘制多段线时,它将从地图上清除先前的多段线,并允许他们重新开始,但是,一旦他们开始单击地图,新的多段线段在地图上将不可见,但是正确保存到数据库。
到目前为止,这是我所做的:
var map;
var polyline = null;
var polylinePath = null;
// HERE I INITIALIZE MY MAP ETC ETC ...
// IN EDIT MODE I ALLOW THE FOLLOWING FUNCTION TO BE CALLED FIRST TO LOAD ANY EXISITNG POLYLINES FOR THE USER
// THIS WORKS FINE, IT SHOWS THE PREVIOUS POLYLINE ON THE MAP.
function loadBasePolylines($mapGuid)
{
var loadUrl = 'classes/Ajax_System.php';
$.getJSON(loadUrl+"?action=loadMapPolylines&mapId="+mapGuid, function(json) {
if(json[0]['hasPolylines'] == 'yes'){
var polylinesArray = [];
var prepath = polylinePath;
if(prepath){
prepath.setMap(null);
}
var points = json[0].Points;
for (i=0; i<points.length; i++) {
polylinesArray.push(new google.maps.LatLng(points[i].lat,points[i].lon));
bounds.extend(new google.maps.LatLng(points[i].lat,points[i].lon));
}
polyline = new google.maps.Polyline({
strokeColor: json[0]['lineColour'],
strokeOpacity: 0.5,
strokeWeight: json[0]['lineThickness'],
clickable: false,
path: polylinesArray
});
polylinePath = polyline.getPath();
polyline.setMap(map);
map.fitBounds(bounds);
}
});
}
// WHEN THE USER PRESS THE "DRAW PATH" BUTTON, THE FOLLOWING FUNCTION IN QUESTION IS CALLED:
function startPolyline()
{
if(polyline != null){
var answer = confirm("This will clear the current polyline from the map. Are you sure you want to continue?");
if(answer){
polyline.setMap(null);
if (tempMarkers) {
for (i in tempMarkers) {
tempMarkers[i].setMap(null);
}
tempMarkers.length = 0;
}
} else {
return;
}
}
var polyOptions = {
strokeColor: polylineColor,
strokeOpacity: polyLineOpacity,
strokeWeight: polyLineWidth,
clickable: false
}
polyline = new google.maps.Polyline(polyOptions);
polyline.setMap(map);
// Add a listener for the click event
google.maps.event.addListener(map, 'click', addPolylinePoint);
}
function addPolylinePoint(event)
{
var path = polyline.getPath();
path.push(event.latLng);
var marker = new google.maps.Marker({
position: event.latLng,
title: '#' + path.getLength(),
icon: '<?php echo URL; ?>public/mapIcons/mm_20_red.png',
map: map
});
tempMarkers.push(marker);
}
到目前为止,我已经尝试过:
任何帮助将由衷的感谢。 先感谢您。
哇,再次阅读完我的问题后,我已经解决了消失的折线问题。 希望有一天有帮助的人:
在我从数据库中加载折线的代码中:
function loadBasePolylines($mapGuid)
{
.
.
.
polyline = new google.maps.Polyline({
strokeColor: json[0]['lineColour'],
strokeOpacity: 0.5,
strokeWeight: json[0]['lineThickness'],
clickable: false,
path: polylinesArray
});
}
我将笔触的不透明度设置为0.5(等于50%)...
但是然后,当我在...中启动折线工具时
function startPolyline()
var polyOptions = {
strokeColor: polylineColor,
strokeOpacity: polyLineOpacity,
strokeWeight: polyLineWidth,
clickable: false
}
...我将不透明度设置为一个名为polyLineOpacity的未设置变量。
一旦我添加了全局变量并在...中应用了加载的值
function loadBasePolylines($mapGuid)
{
.
.
.
strokeOpacity = json[0]['lineOpacity'] * 100;
polyline = new google.maps.Polyline({
strokeColor: json[0]['lineColour'],
strokeOpacity: strokeOpacity,
strokeWeight: json[0]['lineThickness'],
clickable: false,
path: polylinesArray
});
}
...具有正确不透明度的折线再次正确显示!
我称此开发人员为冻结。 Tkx!
尝试在startPolyline函数中重新启动map变量
map = new google.maps.Map(document.getElementById('id of your map')):
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