Geographic Information Systems Asked by TDawg on September 28, 2020
The following code should have 3 features:
2&3 work as expected. I added the drawn polygon last, there is no error on the console, but no polygon is drawn.
Also, it has no errors building in npm.
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import {Draw, Modify, Snap} from 'ol/interaction.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {OSM,TileJSON, Vector as VectorSource} from 'ol/source.js';
import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';
import Feature from 'ol/Feature';
import Polygon from 'ol/geom/Polygon';
import Point from 'ol/geom/Point';
import Transform from 'ol/Proj';
var raster = new TileLayer({
source: new OSM()
});
var source = new VectorSource();
var vector = new VectorLayer({
source: source,
style: new Style({
fill: new Fill({
color: 'rgba(255, 255, 255, 0.2)'
}),
stroke: new Stroke({
color: '#ffcc33',
width: 2
}),
image: new CircleStyle({
radius: 7,
fill: new Fill({
color: '#ffcc33'
})
})
})
});
var feature = new Feature({
geometry: new Polygon([
[-13041991.514129914,8126540.3085058555],
[-13766003.046047103,7167714.225696605],
[-12562578.472725287,6668733.305050973],
[-11486345.114470007,7099226.648353085],
[-11730943.60498257,8439626.376361936],
[-13041991.514129914,8126540.3085058555]
])
});
var vectorSource= new VectorSource({
features: [feature ]
});
var vectorLayer = new VectorLayer({
source: vectorSource
});
var map = new Map({
layers: [raster, vector],
target: 'map',
view: new View({
center: [-11000000, 4600000],
zoom: 4
})
});
var modify = new Modify({source: source});
modify.on('modifyend',function(e){
console.log("feature id is",e.features.getArray()[0].getGeometry().getCoordinates()[0]);
});
map.addInteraction(modify);
console.log(map);
var draw, snap; // global so we can remove them later
var typeSelect = document.getElementById('type');
function addInteractions() {
draw = new Draw({
source: source,
type: typeSelect.value
});
draw.on('drawend',function(e){
console.log(e.feature.getGeometry().getCoordinates()[0]);
})
map.addInteraction(draw);
snap = new Snap({source: source});
map.addInteraction(snap);
}
/**
* Handle change event.
*/
typeSelect.onchange = function() {
map.removeInteraction(draw);
map.removeInteraction(snap);
addInteractions();
};
addInteractions();
You need to add the polygon layer to the map. As it is, you add the raster and the empty layer that will contains the new/edited drawings, but not the source data:
var map = new Map({
layers: [raster, vector, vectorLayer],
target: 'map',
view: new View({
center: [-11000000, 4600000],
zoom: 4
})
});
Answered by JGH on September 28, 2020
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