How do I draw a polyline in Leaflet using pixel coordinates? - leaflet

Question

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);
Then I tried this...
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);
...and the line still isn't showing.
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?

Answer 1

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?
Definitely.
Try this:
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);
You may run in to problems with origin next, though, see map.getPixelOrigin()