New answers tagged openlayers
2
This is not really a GIS question, but pure JS one, but any way ...
When going to the next row, your forgot so set value of right to initial value of left + size, so it retained the last value from previous row, which it utmost right + size, so the first feature/cell drawn has the length of five widths.
Relevant code should then be:
while(topPx > 0) {
...
0
Thanks for the help from professional people. Now the problem is clear. If I want pass character parameter to a SQL view in Geoserver, I should use double quotes and single quotes like this: "viewparams": "col:" + "'GREEN'", where 'GREEN' is the value I want pass. Meanwhile, on the Geoserver side, I should modify the default ...
1
To update viewparams you will need
untiled.getSource().updateParams({"viewparams": 'id:'+num});
1
In QGIS you could render something like the graphic you show using the geometry generator marker option.
Each cardinal direction could have a field associated with it - N, NE, E, etc.
Each triangle would be built using the coordinates ($x, $y) of the point and rotated depending on the compass direction:
make_triangle(
make_point($x, $y),
...
3
In your first example teren should be global so you can remove the old layer before adding a new one
$( document ).ready(function() {
var teren;
$("#id_primarie").change(function(){
console.log('test');
map.removeLayer(teren);
var id_primarie = $('#id_primarie').val();...
1
Apart from directly fetching feature collection from Postgres itself, if you have an array of Polygon/MultiPolygon you can do -
ol.proj.proj4.register(proj4);// This line is optional and required if you have different source projection, here you are registering proj4 js for projection.
const polygon = new ol.Feature({
geometry: new ol.geom....
1
It is not clear if the passed in geojson argument is an array of rows of TEXT representing a geometry each. This is assumed in your function. Do you ever hit the "here" console log?
As mentioned in comments, better fetch a FeatureCollection (as JSONB) from the DB directly [*]:
SELECT JSONB_BUILD_OBJECT(
'type', 'FeatureCollection',
...
0
Macromedia Freehand - if the year was 1999. Thats what i used when i was at University, to do a very similar project.
Jokes aside though, the point im making is that perhaps this is less of a 'GIS Software' question and maybe more of a 'multimedia software' question?
You could potentially create the windmills in said multimedia software and then ave them as ....
1
You will need a tileLoadFunction to load the tile via xhr with an Authorization header. See https://openlayers.org/en/latest/apidoc/module-ol_Tile.html#~LoadFunction
var source = new ol.source.TileWMS({
url:url,
serverType: 'geoserver',
params: {
'LAYERS': '2-0',
'TILED': true
...
1
Deduplicating a polygon is possible, I use the following code:
private LineString deDuplicate(LineString exteriorRing) {
ArrayList<Coordinate> outRing = new ArrayList<>();
int nPoints = exteriorRing.getNumPoints();
Point lastPoint = exteriorRing.getPointN(0);
for (int i = 1; i < nPoints; i++) {
Point p = exteriorRing....
0
I opened an issue here, on the GitHub repo of OpenLayers. M393 Answered me a way of changing declutter and it worked truly.
I used this code and it worked truly.
layer.declutter_ = !layer.declutter_;
let source = layer.getSource();
source.refresh()
Also, M393 said, A PR adding the missing setDeclutter(declutter) method with the above code might make sense, ...
2
You can use a geometry function in the draw to ensure the third point is always to the right of the second point
const draw = new Draw({
source: this.vectorLayer.getSource(),
type: 'LineString',
maxPoints: 3,
geometryFunction: function(coordinates, geometry) {
if (!geometry) {
geometry = new ol.geom.LineString(coordinates);
...
0
The XML being posted, formatted for reability, looks as follows:
<Transaction xmlns="http://www.opengis.net/wfs" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" service="WFS" version="1.1.0" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd">
<Insert&...
0
It's refreshing for me. I don't know it's good for your case or not. (zoom filtering just extra.)
var lyrSource = new VectorTileSource({
cacheSize: 1,
format: new MVT(),
url: 'http://localhost:9080/maps/mapname/:layer/{z}/{x}/{y}.vector.pbf',
});
var layer = new VectorTileLayer({
preload: 0,
declutter: ...
2
The interaction is designed to handle multiple formats and errors are to be expected until it finds a format which works. Some formats will throw an error if not caught while others fail silently, so if no format works which error would it return? For a single format where you you need specific error handling it is easy to add your own drag and drop
map....
0
I think, this is not possible. Working with labels is difficult within qgis2web.
You have two possibilities:
Vector - Geometry tools - Centroids
Save your layer. Set zoom/scale level for the layer, NOT for the labels (create labels). Size for points: 0px.
Other placement for the labels: Move all points or move some points (...before 0px.....)
Now you have ...
2
If you have a EPSG:4326 tilegrid but are only interested in tiles from a smaller region you should use
tileGrid: new ol.tilegrid.WMTS({
origin:ol.extent.getTopLeft(projectionExtent),
resolutions: resolutions,
matrixIds: matrixIds,
extent: [44.03, 23.34, 63.34, 39.78]
})
You should also check the WMTS capabilities document to ...
0
map.getInteractions().forEach(x => x.setActive(false));
Works also with setActive(true) to re-enable interactions.
1
If you are processing a map click using forEachFeatureAtPixel, getFeaturesAtPixel or hasFeatureAtPixel each of those methods has a layer filter option:
layerFilter: function (layer) { return layer === mylayer; },
so you can create separate handlers for each of your layers if you wish.
You can determine the topmost visible layer using
var topLayer = map....
0
function hideshowfeature(layer,id) {
feature=layer.getSource().getFeatureById(id);
if (feature)
{
if (!feature.get('hidden'))
{
feature.setStyle(new ol.style.Style({}));
feature.set('hidden',true);
}
else
{
feature.setStyle();
feature.unset('hidden');
}
...
2
Instead of using all your WMS sources
wmsLayersSources.forEach(function(value, i){
Only use sources which are in visible layers
wmsLayers.forEach(function(layer, i){
if (layer.getVisible()) {
const value = layer.getSource();
queryLayers = `${value["params_"].LAYERS}`
}
...
2
Create separate datasets for the countries and for the borders. (They can be subdivided independently.) Then you can simply fill the land polygons without a border.
You might want to style coastlines and borders on land differently; Natural Earth alreay has those datasets.
0
Thank you @Mike for helping me to get off the wrong track. Now it works fine with OpenLayers 6
The problem in my case was that I could remove the proj4 library which made life easier. I started with the OSM Example Map with EPSG:3587 and added my own WMS Server with EPSG:25832. Therefore I initially neeeded a reprojection. But as all my layers in my final ...
0
This is the code, maybe it's will help someone:
var exportOptions = {
filter: function(element) {
var className = element.className || '';
return (
className.indexOf('ol-control') === -1 ||
className.indexOf('ol-legend') > -1 ||
(className.indexOf('ol-attribution') > -1 &&
className.indexOf('ol-...
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