Set a fixed start point that doesn't respond to drag about l.control.linestringselect

[w8r]

yes, I can add an option for that

[w8r]

@jb2b38, how do you want to define the first(fixed) point?

[jb2b38]

I already know the coordinates of a point of interest that will be on the polyline, so passing those coordinates would be great :)

[jb2b38]

@w8r I was able to add a snapping functionality by changing the closestPointOnSegment a bit. It looks like this:

function closestPointOnSegment(p2, p0, p1) {

  var snap_distance = 30;

  var point0 = new L.latLng(p0[0], p0[1]);
  var point1 = new L.latLng(p1[0], p1[1]);
  var point2 = new L.latLng(p2[0], p2[1]);

  var distance;
  if (point2.distanceTo(point0) < point2.distanceTo(point1)) {
    distance = point2.distanceTo(point0);
    if (distance < snap_distance) {
      return p0;
    }
  } else {
    distance = point2.distanceTo(point1);
    if (distance < snap_distance) {
      return p1;
    }
  }

  var t = pointLineSegmentParameter(p2, p0, p1),
    x10 = p1[0] - p0[0],
    y10 = p1[1] - p0[1],
    p3 = [p0[0] + t * x10, p0[1] + t * y10];
  return p3;
}

[w8r]

@jb2b38, 👍 👍

Do you want me to include that as an option? something like

new LineStringSelect({ snapping: distance});

[jb2b38]

@w8r I think it'd be more useful for other uses if you can make it an option. I only did this quickly to have it work the way I need it at the moment, but it'd be more flexible :) How can I help you to only have a selection forward? I'm trying to figure how works the code but I don't really know where to look for this behaviour.