Guys I used Openlayer 2 for creating a layer on Google map.
I draw a Vector Line using Openlayer 2 and I want to set label middle of that line.
below is my code.
var ol = new OpenLayers.Layer.OSM();
var vector = new OpenLayers.Layer.Vector( "Lines" );
for (var i = 0; i < fromtoLatlngObject.data.length; i++) {
var start_point = new OpenLayers.Geometry.Point(fromtoLatlngObject.data[i].from.lng,fromtoLatlngObject.data[i].from.lat);
var end_point = new OpenLayers.Geometry.Point(fromtoLatlngObject.data[i].to.lng,fromtoLatlngObject.data[i].to.lat);
var firstLine = new OpenLayers.Feature.Vector(new OpenLayers.Geometry.LineString([start_point, end_point]).transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:900913")));
vector.addFeatures([
firstLine
]);
}
var selected_polygon_style = {
strokeWidth: 2,
strokeColor: 'blue',
fontColor: "red",
fontSize: "16px",
fontFamily: "arial, monospace",
fontWeight: "bold",
fontColor: "green",
label: "To: test",
labelAlign: "cm"
};
vector.style = selected_polygon_style;
map.addLayers([ol,vector]);
var markers = new OpenLayers.Layer.Markers( "Marker" );
map.addLayer(markers);
for (var i = 0; i < latlngObj.data.length; i++) {
addMarker(latlngObj,map,markers,i);
}
}
as per Openlayer 2 Document we can set the labelAlign like.
labelAlign: "cm",
I set the labelAlign but not working also you can check in document.
http://dev.openlayers.org/apidocs/files/OpenLayers/Feature/Vector-js.html
or you can also see in the demo given by the Openlayer 2.
http://dev.openlayers.org/examples/vector-features-with-text.html
Thanks
Related
I am kinda stumped on this. The code below works correctly to create a set of gridlines. I would like to set it up so that I can turn them on and off under the overlay/control layers box. How would I go about turning this code on and off using a check box in the control box?
Thank you!
//Grid lines
var hold = 0
for (let i = 0; i <17; i++) {
var pointA = map.unproject([hold, 0], map.getMaxZoom());
var pointB = map.unproject([hold, 8192], map.getMaxZoom());
var pointList = [pointA, pointB];
var firstpolyline = new L.Polyline(pointList, {
color: 'grey',
weight: 4,
opacity: 0.8,
smoothFactor: 1
});
firstpolyline.addTo(map);
var pointA = map.unproject([0, hold], map.getMaxZoom());
var pointB = map.unproject([8192, hold], map.getMaxZoom());
var pointList = [pointA, pointB];
var firstpolyline = new L.Polyline(pointList, {
color: 'grey',
weight: 4,
opacity: 0.8,
smoothFactor: 1
});
firstpolyline.addTo(map);
hold = hold + 512
}```
You can create a FeatureGroup and add to them the layers and then you can add the FeatureGroup to the LayersControl.
var fg = L.featureGroup().addTo(map); // If you want to hide it initial remove .addTo(map)
yourLayerControlVariable.addOverlay(fg);
...
firstpolyline.addTo(fg);
My goal is to use for different shapes (Triangle, Circle, Square, Hexagon etc.) different fill colors and opacity values for each shape.
With the below code I can draw the shapes, set different titles and stroke colors. But I'm not able to set the fill color and the opacity values.
I checked the documentation and its looks like I could achieve this with "fillColor" and "fillOpacity" but it doesn't works.
function GetLonLatObj(lat, lon){
var lonLat = new OpenLayers.LonLat( lon ,lat )
.transform(
new OpenLayers.Projection("EPSG:4326"), // Transformation aus dem Koordinatensystem WGS 1984
map.getProjectionObject() // in das Koordinatensystem 'Spherical Mercator Projection'
);
return lonLat
}
var points = []
var fontColor = "blue";
var title = "Test";
var map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
var zoom=16;
latLonPoint = GetLonLatObj("46.76", "7.606944444444444");
latLonPoint2 = GetLonLatObj("46.735", "7.543055555555555");
latLonPoint3 = GetLonLatObj("46.7169444", "7.569166666666667");
latLonPoint4 = GetLonLatObj("46.76", "7.606944444444444");
latPoint = latLonPoint.lat
lonPoint = latLonPoint.lon
latPoint2 = latLonPoint2.lat
lonPoint2 = latLonPoint2.lon
latPoint3 = latLonPoint3.lat
lonPoint3 = latLonPoint3.lon
latPoint4 = latLonPoint4.lat
lonPoint4 = latLonPoint4.lon
//var point = new OpenLayers.Geometry.Point(828260.4259880, 5933577.75538379);
point = new OpenLayers.Geometry.Point(lonPoint, latPoint);
point2 = new OpenLayers.Geometry.Point(lonPoint2, latPoint2);
point3 = new OpenLayers.Geometry.Point(lonPoint3, latPoint3);
point4 = new OpenLayers.Geometry.Point(lonPoint4, latPoint4);
points.push(point);
points.push(point2);
points.push(point3);
points.push(point4);
var selected_polygon_style = {
strokeWidth: "3",
strokeColor: fontColor,
fontColor: "red",
fontSize: "16px",
fontWeight: "bold",
fontColor: "black",
label: title
};
vectorLayer = new OpenLayers.Layer.Vector();
vectorLayer.style = selected_polygon_style;
//map.addLayers([vector]);
vectorLayer.addFeatures([new OpenLayers.Feature.Vector(new OpenLayers.Geometry.LineString(points))]);
map.addLayers([vectorLayer]);
var markers = new OpenLayers.Layer.Markers( "Markers" );
map.addLayer(markers);
markers.addMarker(new OpenLayers.Marker(latLonPoint));
map.setCenter (latLonPoint, zoom);
<script src="https://buhli.dyndns.org:444/openlayers.js"></script>
<html>
<body>
<div id="mapdiv"></div>
</body>
</html>
Can someone help me here?
Thank you very much and best regards
The problem was the LineString in the follow command.
vectorLayer.addFeatures([new OpenLayers.Feature.Vector(new OpenLayers.Geometry.LineString(points))]);
I could fix it with it as I replaced with LinearRing.
A LinearRing is a special LineString which is closed. A LineString can but must not be closed.
I using OpenLayers 4, and I want to get length at the LineString.
My code snippet:
var trackline = new ol.geom.LineString(points); //points an array with coordinates
var featurething = new ol.Feature({geometry: trackline});
var linestyle = new ol.style.Style({
stroke : new ol.style.Stroke({width: 4, color: 'rgba(0, 180, 220, 1)'})
});
featurething.setStyle(linestyle);
vectorSource.addFeature( featurething );
How get the trackline length, include altitude?
Thanks!
I was recently tasked with creating the map for my Wurm Online game alliance. I crafted a genius SVG-based overlay over a static image of an in-game map. Basically it takes data from a spreadsheet and renders Villages as colored circles on the map.
However, we have members all the over the map, so went about to seeing how I could create a zoom-able web-based map of our lands. The game admins give us a map dump every year or thereabouts, so we can create custom map applications however we feel. I downloaded the recent map dump for the island/server I care about, Xanadu.
The Xanadu dump is a 62MB PNG with a resolution of 8192 x 8192 pixels. I found a tile making program (MapTiler version 7), and I went about creating tiles. After the tiles are done rendering, the program itself creates HTML files with embedded JavaScript all programatically. It gave me a head start with OpenLayers3.
I was able to re-calculate Village coordinates and cobble together a zoom-able tiled map with Village circles. Needless to say, I was very happy when I got my custom OpenLayers3 map. (Working example: http://jackswurmtools.com/Content/Static/map.html)
The way I got it set up, each map "decoration" or colored circle is its own Vector.
The chief complaint from my fellow gamers about my zoom-able map, is that the color Village circles are too big zoomed out, yet too small when zoomed in.
I've tried all kinds of things, but I have yet to find the right examples. I'm used to finding and transforming SVG elements based on events, but the OP3 canvas rendering is NOT obvious to me in the DOM.
Some of my questions are:
How can I detect when my map has been zoomed? Is there some callback I'm missing?
And when a zoom is detected, how can I iterate through all my vectors and update a circle radius.
// jacks fully zoomable xanadu map
var data =
[{
X: "6744",
Y: "-2355.75",
Name: "Amish Creek",
Villagers: ["Aniceset", "Fulano"],
BackColor: "Aquamarine",
LandMarkType: "Member"
}, {
X: "6808.75",
Y: "-2265.125",
Name: "Amish Estates",
Villagers: ["Aniceset", "Villagers"],
BackColor: "Purple",
LandMarkType: "Member"
}];
console.log(data);
var mapExtent = [0.00000000, -8192.00000000, 8192.00000000, 0.00000000];
var mapMinZoom = 0;
var mapMaxZoom = 5;
var mapMaxResolution = 1.00000000;
var tileExtent = [0.00000000, -8192.00000000, 8192.00000000, 0.00000000];
var mapResolutions = [];
for (var z = 0; z <= mapMaxZoom; z++) {
mapResolutions.push(Math.pow(2, mapMaxZoom - z) * mapMaxResolution);
}
var mapTileGrid = new ol.tilegrid.TileGrid({
extent: tileExtent,
minZoom: mapMinZoom,
resolutions: mapResolutions
});
var features = [];
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.XYZ({
projection: 'PNGMAP',
tileGrid: mapTileGrid,
url: "http://jackswurmtools.com/Content/Static/{z}/{x}/{y}.png"
})
}),
],
view: new ol.View({
zoom: 4,
center: [6602.375, -2250.3125],
projection: ol.proj.get('PNGMap'),
maxResolution: mapTileGrid.getResolution(mapMinZoom)
}),
});
map.getView();
map.on('singleclick', function(evt) {
var coord = evt.coordinate;
console.log(coord);
$("#coord-overlay").html("[" + coord[0] + ", " + coord[1] + "]");
});
// zoom stuff?
// add layers via JSON iteration
renderSVG(data);
drawLines();
function renderSVG(data) {
var vectorSource = new ol.layer.Vector({});
console.log(map.getView().getZoom());
jQuery.each(data, function() {
var fill = new ol.style.Fill({
color: this.BackColor
});
var stroke = new ol.style.Stroke({
color: [180, 0, 0, 1],
width: 1
});
var style = new ol.style.Style({
image: new ol.style.Circle({
fill: fill,
stroke: stroke,
radius: map.getView().getZoom() * 5,
opacity: 0.7
}),
fill: fill,
stroke: stroke,
text: new ol.style.Text({
font: '12px helvetica,sans-serif',
text: this.Name,
fill: new ol.style.Fill({
color: '#000'
}),
stroke: new ol.style.Stroke({
color: '#fff',
width: 2
})
})
});
var point_feature = new ol.Feature({});
var point_geom = new ol.geom.Point([this.X, this.Y]);
point_feature.setGeometry(point_geom);
var vector_layer = new ol.layer.Vector({
source: new ol.source.Vector({
features: [point_feature],
})
});
vector_layer.setStyle(style);
map.addLayer(vector_layer);
});
}
function drawLines() {
var stroke = new ol.style.Stroke({
color: [255, 0, 0, 1],
width: 6
});
var style = new ol.style.Style({
fill: null,
stroke: stroke,
text: new ol.style.Text({
font: '12px helvetica,sans-serif',
text: "Sandokhan / Wargasm Canal",
fill: new ol.style.Fill({
color: '#000'
}),
stroke: new ol.style.Stroke({
color: '#fff',
width: 2
})
})
});
var line_feature = new ol.Feature({});
var coords = [
[6607.5, -1921],
[6894, -1921]
];
var layerLines = new ol.layer.Vector({
source: new ol.source.Vector({
features: [new ol.Feature({
geometry: new ol.geom.LineString(coords, 'XY'),
name: 'Line',
})]
})
});
layerLines.setStyle(style);
map.addLayer(layerLines);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.8.2/ol.min.css" type="text/css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.8.2/ol.min.js" type="text/javascript"></script>
<div id="map"></div>
<div id="coord-overlay">[6612, -2252]</div>
<input id="slider" type="range" min="0" max="1" step="0.1" value="1" oninput="layer.setOpacity(this.value)">
You are looking for a resolution listener, the API docs is an excellent place:
map.getView().on('change:resolution', function(){
var zoom = map.getView().getZoom();
// your conditions
if (zoom < 10) {
// your ol.layer.Vector assuming `vector_layer` global variable
vector_layer.setStyle(style_with_another_radius);
}
});
you can listen to the moveend event for the zoom, however it is also fired when you move the map:
map.on('moveend', function(){
var radius= map.getView().getZoom() * someFactor; // or whatever +,/ ...
yourVectorVillage.setStyle(new ol.style.Circle({ radius : radius}));
// or a style of your own where you can modify the radius
});
I was planning to draw polygon from lat long values referring this code.
open layers 3 how to draw a polygon programmically?
var polyCoordinates =[[1.300910900488229, 44.28372648003116],[1.3373031124022878, 44.13311552125895],[1.6648330196289067, 44.12030076099872]];
var polygon = new OpenLayers.Geometry.Polygon([polyCoordinates]);
// Create feature with polygon.
var feature = new OpenLayers.Feature(polygon);
// Create vector source and the feature to it.
var vectorSource = new OpenLayers.source.Vector();
// Create the vectorial layer
var vectorLayer = new OpenLayers.Layer.Vector('Vector Layer', {
source: vectorSource
styleMap: new OpenLayers.StyleMap({
'default': OpenLayers.Util.applyDefaults({
strokeWidth: 3,
graphicName: 'triangle',
pointRadius: '${radius}',
rotation: '${angle}'
}, OpenLayers.Feature.Vector.style['default']
),
'select': OpenLayers.Util.applyDefaults({
pointRadius: '${radius}'
}, OpenLayers.Feature.Vector.style['select']
)
})
});
OpenLayers.source is undefined is showing as error. Any help would be appreciated.
var sitePoints = [];
var coordinates =[{"long":1.300910900488229,"lat":44.28372648003116},
{"long":1.3373031124022878,"lat":44.13311552125895},
{"long":1.6648330196289067,"lat":44.12030076099872}];
var siteStyle = {
label:'ring',
title: 'press to close as a ring',
cursor: "pointer",
fontSize: '8px',
fontColor: '#222',
pointRadius: 10,
fillColor: '#cccccc',
strokeColor: '#444444'
};
var epsg4326 = new OpenLayers.Projection("EPSG:4326");
for (var i in coordinates) {
var coord = coordinates[i];
var point = new OpenLayers.Geometry.Point(coord.long, coord.lat);
// transform from WGS 1984 to Spherical Mercator
point.transform(epsg4326, map.getProjectionObject());
sitePoints.push(point);
}
console.log(sitePoints);
var linearRing = new OpenLayers.Geometry.LinearRing(sitePoints);
var geometry = new OpenLayers.Geometry.Polygon([linearRing]);
var polygonFeature = new OpenLayers.Feature.Vector(geometry, null, siteStyle);
vectorLayer.addFeatures([polygonFeature]);
map.addLayer(vectorLayer);
Here is a proper way to do this in OpenLayers 3, which has a different API than previous versions.
var polyCoordinates =[
[1.300910900488229, 44.28372648003116],
[1.3373031124022878, 44.13311552125895],
[1.6648330196289067, 44.12030076099872]];
var polygon = new ol.geom.Polygon([polyCoordinates]);
polygon.applyTransform(ol.proj.getTransform('EPSG:4326', 'EPSG:3857'));
// Create feature with polygon.
var feature = new ol.Feature({
geometry: polygon
});
// Create vector source and the feature to it.
var vectorSource = new ol.source.Vector({
features: [feature]
});
// Create the vectorial layer
var vectorLayer = new ol.layer.Vector({
source: vectorSource,
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#eedd00',
width: 3
})
})
});
Edit: If you stick with OpenLayers 2, you need to create the polygon via linear ring. The setup is a little bit different. There is no OpenLayers source to deal with.
var polyCoordinates =[
[1.300910900488229, 44.28372648003116],
[1.3373031124022878, 44.13311552125895],
[1.6648330196289067, 44.12030076099872]];
// Create the polygon via linear ring
var points = [];
for (var i = 0; i < polyCoordinates.length; i++) {
coord = polyCoordinates[i];
points.push(new OpenLayers.Geometry.Point(coord[0], coord[1]));
}
var linearRing = new OpenLayers.Geometry.LinearRing(points);
var polygon = new OpenLayers.Geometry.Polygon([linearRing]);
var srcProj = new OpenLayers.Projection("EPSG:4326");
var targetProj = new OpenLayers.Projection("EPSG:3857");
polygon.transform(srcProj, targetProj);
// Create feature with polygon.
var feature = new OpenLayers.Feature.Vector(polygon);
// Create the vectorial layer
var vectorLayer = new OpenLayers.Layer.Vector('Vector Layer',
OpenLayers.Feature.Vector.style['default']
);
vectorLayer.addFeatures([feature]);