如何使用像素坐标在Leaflet中绘制折线? [英] How do I draw a polyline in Leaflet using pixel coordinates?

问题描述

我的地图已经设置好，标记已经到位，并且工作正常.我现在想在标记之间添加线条；因此我使用了Leaflet的代码示例，并添加了几个标记的坐标，但是该线未显示在地图上.

My map is set up and the markers are in place, and it's working perfectly. I now want to add lines between the markers; so I used the code example from Leaflet and added the coords from a couple markers, but the line isn't showing on the map.

var polylinePoints = [
    [3474, 12427],
    [2298, 11596],
];

var polyline = L.polyline(polylinePoints).addTo(map);

然后我尝试了...

var pointA = new L.LatLng(3474, 12427);
var pointB = new L.LatLng(2298, 11596);
var pointList = [pointA, pointB];

var firstpolyline = new L.Polyline(pointList, {
    color: 'red',
    weight: 3,
    opacity: 0.5,
    smoothFactor: 1
});
firstpolyline.addTo(map);

...但该行仍未显示.

...and the line still isn't showing.

问题可能出在我使用的是像素坐标，而不是实际的经纬度坐标吗?如果是这样，如何使用像素坐标在标记之间绘制线条?

Could the problem be that I'm using pixel coordinates and not actual lat and lng coords? If so, how do I draw lines between markers using pixel coordinates?

推荐答案

问题可能出在我使用的是像素坐标，而不是实际的经纬度坐标吗?如果是这样，如何使用像素坐标在标记之间绘制线条?

Could the problem be that I'm using pixel coordinates and not actual lat and lng coords? If so, how do I draw lines between markers using pixel coordinates?

当然.

尝试一下:

var pointA = map.layerPointToLatLng(L.point(3474, 12427));
var pointB = map.layerPointToLatLng(L.point(2298, 11596));
var pointList = [pointA, pointB];
var firstpolyline = new L.Polyline(pointList, {
    color: 'red',
    weight: 3,
    opacity: 0.5,
    smoothFactor: 1
});
firstpolyline.addTo(map);

接下来，您可能会遇到起源问题，请参见 map.getPixelOrigin()

You may run in to problems with origin next, though, see map.getPixelOrigin()

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