In Leaflet.Editable I want to confine/limit my customers to draw only in a specific area/bounds.
actually im trying to limit them to (90, -90, 180, -180) bounds of map..
maxBounds: [[-90, -180], [90, 180]]
I was not able to find anything anywhere and it seems that i am missing something.
CODEPEN DEMO
please help.
EDIT:
the Y axis is blocking correctly and mouse cannot stretch shape beyond top and bottom.
the problem is in X axis (as seen in pictures)
as for now i solved it with after save check and clear shape if it out of map bounds (BAD USER EXPERIENCE). i need a mouse confinement just like y axis does.
Without knowing your use case (why the whole world map??) Quickest and easiest fix would be to simply set the map's minZoom to something a bit higher, for example, I found that minZoom: 5 was adequate except for cases where the map was both really short and really wide (which is rarely the case in most apps I've seen).
But the real fix involves writing your own custom overrides for dragging markers and shapes.
According to API doc the L.Editable plugin allows you to override a bunch of stuff including the VertexMarker class, via map.editTools.options.vertexMarkerClass.
Fixed codepen: http://codepen.io/anon/pen/GrPpRY?editors=0010
This snippet of code that allows you to constrain the longitude for dragging vertex markers by correcting values under -180 and over 180 is this:
// create custom vertex marker editor
var vertexMarkerClass = L.Editable.VertexMarker.extend({
onDrag: function(e) {
e.vertex = this;
var iconPos = L.DomUtil.getPosition(this._icon),
latlng = this._map.layerPointToLatLng(iconPos);
// fix out of range vertex
if (latlng.lng < -180) {
e.latlng.lng = latlng.lng = -180;
this.setLatLng(latlng);
}
if (latlng.lng > 180) {
e.latlng.lng = latlng.lng = 180;
this.setLatLng(latlng);
}
this.editor.onVertexMarkerDrag(e);
this.latlng.update(latlng);
this._latlng = this.latlng; // Push back to Leaflet our reference.
this.editor.refresh();
if (this.middleMarker) this.middleMarker.updateLatLng();
var next = this.getNext();
if (next && next.middleMarker) next.middleMarker.updateLatLng();
}
});
// attach custom editor
map.editTools.options.vertexMarkerClass = vertexMarkerClass;
I didn't code for dragging the shape as a whole (the rectangle, in this case). While the VertexMarker fix should address all kinds of vertex dragging, you need to override each shape's drag handler to properly constrain the bounds. And if bounds are exceeded, crop the shape appropriately. As was pointed out, Leaflet already does this for latitude, but because Leaflet allows wrapping the map around horizontally you have your essential problem. Using rec.on("drag") to correct the bounds when they cross over your min/max longitude is the only way to address it. It is basically the same solution as I have laid out for the vertexMarkerClass - actual code left as exercise for the diligent reader.
Related
I'm trying to add circles to my map, but for some reason the circles only show as dots, irrespective of the radius size.
var circle = L.circle(map.unproject([9541, 7658], map.getMaxZoom()), {
radius: 500
}).addTo(map);
I'm using pixel coordinates, but as you can see I'm converting them, so even though I only get dots on the map, they show at the right coordinates. I would hope this isn't the issue, but...?
I've successfully added circleMarkers, but the radius doesn't grow when zooming. At least not that I could see.
So the question is: how can I get the dots to show as circles?
Using Leaflet 1.9.3
Update
It appears that with pixel coordinates you need to enter a really high value for the radius. Thought I had already tried this before asking the question but apparently not.
var circle = L.circle(map.unproject([9541, 7658], map.getMaxZoom()), {
radius: 50000
}).addTo(map);
Unfortunately they're all showing at different sizes, even with the same radius, but that's a different question...
I originally misread your question and gave an incorrect answer, sorry. Circle radius is static. I think that the best way to change it with zoom level would be to use a zoom event listener:
let currZoom = map.getZoom();
let circles = [/* Store your circles here as you create them */];
map.on("zoomend", () => {
const zoomDiff = map.getZoom() - currZoom;
currZoom = map.getZoom();
for (const circle of circles) {
circle.setRadius(circle.getRadius() * 2 ** zoomDiff);
}
});
It's been a while since I've worked with Leaflet, but I think that will do the trick.
Edited to account for your comment regarding multiple circles.
I am working with Leaflet and Leaflet-Draw in Angular to draw some polygons on the Google Map. How can I implement a listener when the user clicks exactly on the edge of the drawn polygons and get the lat and lng of that edge. I know a similar situation can be implemented with Google Map API like the code below, but I can not find any source to help me implement the same thing in Leaflet.
google.maps.event.addListener(polygon, 'click', function (event) { console.log(event.edge) }
Google Map Documentation: https://developers.google.com/maps/documentation/javascript/reference/polygon#PolyMouseEvent
For those who come across this question: I found a solution myself!
I didn't find anything directly from Leaflet draw library that I could use, so I defined the problem for myself as a trigonometry problem and solve it that way.
I defined a function in which on polygon click, it converts the event.latlng and loops over polygon.getLatLngs()[0] taking a pair of A and B points. A is the first coordinates, B is the next and if it reaches to the end of array, B will be the first point. Then using Collinear Function of 3 points with x, y, I checked if the clicked x, y has a same slope as point A and B.(has to be rounded it up), if so, I would save that A and B point pair with their latLng information and further used it in my project.
Although this method works, I would appreciate if anybody would know a better solution or library built-in function that can be used instead. Thanks!
When the user clicks on the polygon you can loop through all corners and check if he clicked in the near of the corner.
poly.on('click', function(e){
var latlng = e.latlng;
var corners = poly.getLatLngs();
if(!L.LineUtil.isFlat(corners)){ //Convert to a flat array
corners = corners[0];
}
//Convert the point to pixels
var point = mymap.latLngToContainerPoint(latlng);
//Loop through each corner
corners.forEach(function(ll){
//Convert the point to pixels
var point1 = mymap.latLngToContainerPoint(ll);
var distance = Math.sqrt(Math.pow(point1.x - point.x, 2) + Math.pow(point.y - point1.y, 2));
//Check if distance between pixels is smaller then 10
if(distance < 10){
console.log('corner clicked');
}
});
});
This is plain JS you have to convert it self to angular.
A alternativ is to place on each corner a DivMarker or a CircleMarker and fire a event if the marker is clicked.
Looks like: https://geoman.io/leaflet-geoman
Anybody know why the following is not reciprocal? latLng and new
var point = dispmap.latLngToContainerPoint(latlng);
var newPoint = L.point([point.x, point.y]);
var newLatLng = dispmap.containerPointToLatLng(newPoint);
When I execute this code I send in latlng=(26.75529,-80.93581)
newLatLng, which by inspection of the code above I would expect to reciprocate gives back...
newLatLng = (26.75542,-80.93628)
I'm wanting to array some markers with identical lat-lons around the shared spot on a map, and bumping each by some screen coordinates looks like the best method based on some blog/issue reading I've done.
I'm, "close" to what I want to achieve, but as I try to validate what these leaflet calls are doing for me I hit the fundamental question above.
They can't be ...
Latitude and longitude are float values while x and y are integer values.
This means that there are an (theoretically) infinite number of latlng's and a rather small number of points on your view (width * height).
Furthermore, I'm not sure how you define identical latlng's; the best you can't to is to speak of proximity.
If I read between the lines, identical may mean that the markers overlap. Then the best way is to have a look how Leaflet.MarkerCluster are tackling with the problem.
I was able to achieve my desired result by altering zoom level to avoid pixel-point quantization effects on my translations. The screenshot below illustrates an orange and two green circle markers that represent an identical lat-lon, but I want the green arrayed around the orange in a circular fashion...in this example there are only 2 green.
I perform simple circular array math with an angular step size of PI/4 in this example. The KEY to getting the visual effect correct is the "dispmap.setZoom(dispmap._layersMaxZoom)" call BEFORE I do the math, and then I invoke "dispmap.setZoom(mats.zoom)" after the math, which will give the user the desired zoom level as specified by variable mats.zoom.
var arrayRad=20;
var dtheta=Math.PI/4;
var theta=0;
dispmap.setZoom(dispmap._layersMaxZoom)
L.geoJson(JSON.parse(mats.intendeds), {
pointToLayer: function (feature, latlng) {
var point = dispmap.latLngToContainerPoint(latlng);
dx = arrayRad*Math.cos(theta);
dy = arrayRad*Math.sin(theta);
theta += dtheta;
var newPoint = L.point([point.x + dx, point.y+ dy]);
var newLatLng = dispmap.containerPointToLatLng(newPoint);
return L.circleMarker(newLatLng, intendedDeliveryLocationMarkerOptions);
}, onEachFeature: onEachIntendedLocFeature }).addTo(dispmap);
dispmap.setZoom(mats.zoom);
Sample screen shot at max zoom level: 2 arrayed markers
Is there a way to move icons/markers to a certain location where it will then "snap" to the location?
For example, chess games on the computer where when you move a chess piece to the correct square, it will snap to that position when you let go of the piece near/around the square.
So what I want is to move a marker or an icon to a certain location, let's say the capital of California, and the marker will "snap" to the location that I want when I move it and let go of the marker near the location. But I also want to still be able to move the marker if I want to.
I know Mapbox gl has bearingSnap which snaps the map back to north after the user rotates the map but I can't find anything for just icons/markers and I don't believe I can use bearingSnap for it.
Thanks.
You can use Turfs distance function: turf.distance(pt1, pt2) to measure distances between 2 points. If then the calculated distance is under a certain threshold, you can set the location of your dragging point to the location of your snap point.
I have you a working example in a jsfiddle:
https://jsfiddle.net/andi_lo/nmc4kprn/
function onMove(e) {
if (!isDragging) return;
var coords = e.lngLat;
// Set a UI indicator for dragging.
canvas.style.cursor = 'grabbing';
// Update the Point feature in `geojson` coordinates
// and call setData to the source layer `point` on it.
geojson.features[0].geometry.coordinates = [coords.lng, coords.lat];
map.getSource('point').setData(geojson);
let snapTo = map.getSource('snap')._data;
turf.featureEach(snapTo, (feature) => {
let dist = turf.distance(feature, turf.point([coords.lng, coords.lat]));
console.log(dist);
// if the distance of the dragging point is under a certain threshold
if (dist < 500) {
// set the location of the dragging point to the location of the snapping point
geojson.features[0].geometry.coordinates = feature.geometry.coordinates;
map.getSource('point').setData(geojson);
}
});
}
This is a feature you can and should implement upstream of GL JS. When you construct the coordinate of the marker or GeoJSON feature, snap it to the desired grid.
Does anyone know a way to make overlapping circles in mapbox show the same color and only have the border around the outer edge display?
I have this:
And I made this in photoshop for what I want:
While I don't think there is a way to style all the circles to show their group outline, you can achieve the effect you want by creating a union of all the circle geometries and applying your style to that. Unfortunately, Leaflet's L.circle class offers no way to access a circle's geometry beyond the center point, and to perform a union, you need the path of the circle itself. Fortunately, there is Leaflet Geodesy and its LGeo.circle class, which produces circular polygons with a given radius and number of segments. Once you have these polygon representations of your circles, you can use turf.union to produce the outline you want.
Say you are starting with a layer of points called pointLayer (this can be a L.geoJson, L.mapbox.featureLayer, or any other class that inherits the .eachLayer method). You can then iterate over the features, creating a circular polygon for each of them and adding it to a temporary layer group, like this:
var circleLayer = L.layerGroup();
var radius = 5000
var opts = {
parts: 144
};
pointLayer.eachLayer(function(layer) {
LGeo.circle(layer.getLatLng(), radius, opts).addTo(circleLayer);
});
where radius is in meters and the parts option is the number of segments you want your polygons to have. Next, use the .getLayers method to get an array of all the layers in the temporary group, then iterate over that to create a union of all the features:
var circleUnion = unify(circleLayer.getLayers()).addTo(map);
function unify(polyList) {
for (var i = 0; i < polyList.length; ++i) {
if (i == 0) {
var unionTemp = polyList[i].toGeoJSON();
} else {
unionTemp = turf.union(unionTemp, polyList[i].toGeoJSON());
}
}
return L.geoJson(unionTemp, {style: unionStyle});
}
where unionStyle is whatever style you want to apply to your newly-combined circles. Here is an example fiddle showing all this with some random data:
http://fiddle.jshell.net/nathansnider/L2d626hn/