我正在尝试向桌面应用程序显示一个地图，该应用程序将在地图外部具有控件，这些控件将填充html和js的某些部分。
我无法弄清楚的是，一旦我设置了路线，就会在距离起点500英里的路线上找到标记。
基本上，如果你想开500英里的地方，你会得到。我不想从一开始就是半径，而是在所选路线上500英里。我基本上尝试拼凑了我在网上找到的不同解决方案，但无法让它发挥作用。
我知道1000不会= 500英里，我只是想让任何事情发挥作用。
这就是我所拥有的：
var side_bar_html = "";
var gmarkers = [];
var map = null;
var startLocation = null;
var endLocation = null;
var length;
function initialize() {
var center = new google.maps.LatLng(24.7756, 121.0062);
map = new google.maps.Map(document.getElementById('map_canvas'), {
center: center,
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
google.maps.event.addListener(map, 'click', function() {
infowindow.close();
});
var directionsService = new google.maps.DirectionsService();
var request = {
origin: "%start%",
destination: "%end%",
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
var polyline = new google.maps.Polyline({
path: [],
strokeColor: 'green',
strokeWeight: 3
});
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
var bounds = new google.maps.LatLngBounds();
var route = response.routes[0];
var summaryPanel = document.getElementById("directions_panel");
var detailsPanel = document.getElementById("direction_details");
startLocation = new Object();
endLocation = new Object();
summaryPanel.innerHTML = "";
detailsPanel.innerHTML = '<ul>';
// For each route, display summary information.
for (var i = 0; i < route.legs.length; i++) {
var routeSegment = i + 1;
summaryPanel.innerHTML += "<b>Route Segment: " + routeSegment + "</b><br />";
summaryPanel.innerHTML += route.legs[i].start_address + " to ";
summaryPanel.innerHTML += route.legs[i].end_address + "<br />";
summaryPanel.innerHTML += route.legs[i].distance.text + "<br /><br />";
}
var path = response.routes[0].overview_path;
var legs = response.routes[0].legs;
for (i = 0; i < legs.length; i++) {
if (i == 0) {
startLocation.latlng = legs[i].start_location;
startLocation.address = legs[i].start_address;
createMarker(legs[i].start_location,"start",legs[i].start_address,"green");
}
endLocation.latlng = legs[i].end_location;
endLocation.address = legs[i].end_address;
var steps = legs[i].steps;
for (j = 0; j < steps.length; j++) {
var nextSegment = steps[j].path;
detailsPanel.innerHTML += "<li>"+steps[j].instructions;
var dist_dur = "";
if (steps[j].distance && steps[j].distance.text) dist_dur += " "+steps[j].distance.text;
if (steps[j].duration && steps[j].duration.text) dist_dur += " "+steps[j].duration.text;
if (dist_dur != "") {
detailsPanel.innerHTML += "("+dist_dur+")<br /></li>";
} else {
detailsPanel.innerHTML += "</li>";
}
for (k = 0; k < nextSegment.length; k++) {
polyline.getPath().push(nextSegment[k]);
bounds.extend(nextSegment[k]);
}
length = google.maps.geometry.spherical.computeLength(polyline.getPath());
detailsPanel.innerHTML += "</ul>";
polyline.setMap(map);
map.fitBounds(bounds);
createMarker(endLocation.latlng, "end", endLocation.address, "red");
// == create the initial sidebar ==
makeSidebar();
}
}
}
});
var i = 1;
var remainingDist = length;
while (remainingDist > 0) {
createMarker( polyline.GetPointAtDistance(1000 * i), i + " km", "stuff", "green" );
remainingDist -= 1000;
i++;
}
}
var icons = new Array();
icons["red"] = new google.maps.MarkerImage(
"",
// This marker is 20 pixels wide by 34 pixels tall.
new google.maps.Size(20, 20),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is at 9,34.
new google.maps.Point(9, 34)
);
function getMarkerImage(iconColor) {
if ((typeof(iconColor) == "undefined") || (iconColor == null)) {
iconColor = "red";
}
if (!icons[iconColor]) {
icons[iconColor] = new google.maps.MarkerImage(
"",
// This marker is 20 pixels wide by 34 pixels tall.
new google.maps.Size(20, 20),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is at 6,20.
new google.maps.Point(9, 34)
);
}
return icons[iconColor];
}
var iconImage = new google.maps.MarkerImage(
'',
// This marker is 20 pixels wide by 34 pixels tall.
new google.maps.Size(20, 20),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is at 9,34.
new google.maps.Point(9, 34)
);
var iconShadow = new google.maps.MarkerImage(
'http://www.google.com/mapfiles/shadow50.png',
// The shadow image is larger in the horizontal dimension
// while the position and offset are the same as for the main image.
new google.maps.Size(37, 34),
new google.maps.Point(0, 0),
new google.maps.Point(9, 34)
);
// Shapes define the clickable region of the icon.
// The type defines an HTML <area> element 'poly' which
// traces out a polygon as a series of X,Y points. The final
// coordinate closes the poly by connecting to the first
// coordinate.
var iconShape = {
coord: [9,0,6,1,4,2,2,4,0,8,0,12,1,14,2,16,5,19,7,23,8,26,9,30,9,34,11,34,11,30,12,26,13,24,14,21,16,18,18,16,20,12,20,8,18,4,16,2,15,1,13,0],
type: 'poly'
};
var infowindow = new google.maps.InfoWindow({
size: new google.maps.Size(150, 50)
});
function createMarker(map, latlng, title) {
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: title
});
}
function createMarker(latlng, label, html, color) {
var contentString = '<b>' + label + '</b><br>' + html;
var marker = new google.maps.Marker({
position: latlng,
map: map,
shadow: iconShadow,
icon: getMarkerImage(color),
shape: iconShape,
title: label,
zIndex: Math.round(latlng.lat() * -100000) << 5
});
marker.myname = label;
gmarkers.push(marker);
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map, marker);
});
}
function myclick(i) {
google.maps.event.trigger(gmarkers[i], "click");
}
// == rebuilds the sidebar to match the markers currently displayed ==
function makeSidebar() {
var html = "";
for (var i = 0; i < gmarkers.length; i++) {
html += '<a href="javascript:myclick(' + i + ')">' + gmarkers[i].myname + '<\/a><br>';
}
document.getElementById("side_bar").innerHTML = html;
}