112 lines
2.9 KiB
JavaScript
112 lines
2.9 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';
|
|
import {fromLonLat} from '../src/ol/proj.js';
|
|
|
|
const columbusCircleCoords = fromLonLat([-73.98189, 40.76805]);
|
|
const labelTextStroke = 'rgba(120, 120, 120, 1)';
|
|
const labelText = 'Columbus Circle';
|
|
|
|
let pointerOverFeature = null;
|
|
|
|
const renderLabelText = (ctx, x, y, stroke) => {
|
|
ctx.fillStyle = 'rgba(255,0,0,1)';
|
|
ctx.strokeStyle = stroke;
|
|
ctx.lineWidth = 1;
|
|
ctx.textAlign = 'center';
|
|
ctx.textBaseline = 'middle';
|
|
|
|
ctx.font = `bold 30px verdana`;
|
|
ctx.moveTo(x, y);
|
|
ctx.lineTo(x, y);
|
|
ctx.filter = 'drop-shadow(7px 7px 2px #e81)';
|
|
ctx.fillText(labelText, x, y);
|
|
ctx.strokeText(labelText, x, y);
|
|
};
|
|
|
|
const circleFeature = new Feature({
|
|
geometry: new Circle(columbusCircleCoords, 50),
|
|
});
|
|
|
|
circleFeature.set('label-color', labelTextStroke);
|
|
|
|
circleFeature.setStyle(
|
|
new Style({
|
|
renderer(coordinates, state) {
|
|
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();
|
|
|
|
renderLabelText(ctx, x, y, circleFeature.get('label-color'));
|
|
},
|
|
hitDetectionRenderer(coordinates, state) {
|
|
const [x, y] = coordinates[0];
|
|
const ctx = state.context;
|
|
renderLabelText(ctx, x, y, circleFeature.get('label-color'));
|
|
},
|
|
})
|
|
);
|
|
|
|
const vectorLayer = new VectorLayer({
|
|
source: new VectorSource({
|
|
features: [circleFeature],
|
|
}),
|
|
});
|
|
|
|
const map = new Map({
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM(),
|
|
visible: true,
|
|
}),
|
|
vectorLayer,
|
|
],
|
|
target: 'map',
|
|
view: new View({
|
|
center: columbusCircleCoords,
|
|
zoom: 19,
|
|
}),
|
|
});
|
|
|
|
map.on('pointermove', (evt) => {
|
|
const featureOver = map.forEachFeatureAtPixel(evt.pixel, (feature) => {
|
|
feature.set('label-color', 'rgba(255,255,255,1)');
|
|
return feature;
|
|
});
|
|
|
|
if (pointerOverFeature && pointerOverFeature != featureOver) {
|
|
pointerOverFeature.set('label-color', labelTextStroke);
|
|
}
|
|
pointerOverFeature = featureOver;
|
|
vectorLayer.getSource().changed();
|
|
});
|