67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
import Feature from '../src/ol/Feature.js';
|
|
import Map from '../src/ol/Map.js';
|
|
import View from '../src/ol/View.js';
|
|
import {Circle} from '../src/ol/geom.js';
|
|
import {OSM, Vector as VectorSource} from '../src/ol/source.js';
|
|
import {Style} from '../src/ol/style.js';
|
|
import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
|
|
|
|
const circleFeature = new Feature({
|
|
geometry: new Circle([12127398.797692968, 4063894.123105166], 50),
|
|
});
|
|
circleFeature.setStyle(
|
|
new Style({
|
|
renderer(coordinates, state) {
|
|
// eslint-disable-next-line no-console
|
|
console.log('This circle is rendered by the code below.', Date.now());
|
|
const [[x, y], [x1, y1]] = coordinates;
|
|
const ctx = state.context;
|
|
const dx = x1 - x;
|
|
const dy = y1 - y;
|
|
const radius = Math.sqrt(dx * dx + dy * dy);
|
|
|
|
const innerRadius = 0;
|
|
const outerRadius = radius * 1.4;
|
|
|
|
const gradient = ctx.createRadialGradient(
|
|
x,
|
|
y,
|
|
innerRadius,
|
|
x,
|
|
y,
|
|
outerRadius
|
|
);
|
|
gradient.addColorStop(0, 'rgba(255,0,0,0)');
|
|
gradient.addColorStop(0.6, 'rgba(255,0,0,0.2)');
|
|
gradient.addColorStop(1, 'rgba(255,0,0,0.8)');
|
|
ctx.beginPath();
|
|
ctx.arc(x, y, radius, 0, 2 * Math.PI, true);
|
|
ctx.fillStyle = gradient;
|
|
ctx.fill();
|
|
|
|
ctx.arc(x, y, radius, 0, 2 * Math.PI, true);
|
|
ctx.strokeStyle = 'rgba(255,0,0,1)';
|
|
ctx.stroke();
|
|
},
|
|
})
|
|
);
|
|
|
|
new Map({
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM(),
|
|
visible: true,
|
|
}),
|
|
new VectorLayer({
|
|
source: new VectorSource({
|
|
features: [circleFeature],
|
|
}),
|
|
}),
|
|
],
|
|
target: 'map',
|
|
view: new View({
|
|
center: [12127398.797692968, 4063894.123105166],
|
|
zoom: 19,
|
|
}),
|
|
});
|