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| import Feature from 'ol/Feature.js';
import Map from 'ol/Map.js';
import Point from 'ol/geom/Point.js';
import VectorLayer from 'ol/layer/Vector.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import {Fill, RegularShape, Stroke, Style} from 'ol/style.js';
const stroke = new Stroke({color: 'black', width: 2});
const fill = new Fill({color: 'red'});
const styles = {
'square': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
radius: 10,
angle: Math.PI / 4,
}),
}),
'rectangle': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
radius: 10 / Math.SQRT2,
radius2: 10,
points: 4,
angle: 0,
scale: [1, 0.5],
}),
}),
'triangle': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 3,
radius: 10,
rotation: Math.PI / 4,
angle: 0,
}),
}),
'star': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 5,
radius: 10,
radius2: 4,
angle: 0,
}),
}),
'cross': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
radius: 10,
radius2: 0,
angle: 0,
}),
}),
'x': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
radius: 10,
radius2: 0,
angle: Math.PI / 4,
}),
}),
'stacked': [
new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
radius: 5,
angle: Math.PI / 4,
displacement: [0, 10],
}),
}),
new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
radius: 10,
angle: Math.PI / 4,
}),
}),
],
};
const styleKeys = [
'x',
'cross',
'star',
'triangle',
'square',
'rectangle',
'stacked',
];
const count = 250;
const features = new Array(count);
const e = 4500000;
for (let i = 0; i < count; ++i) {
const coordinates = [2 * e * Math.random() - e, 2 * e * Math.random() - e];
features[i] = new Feature(new Point(coordinates));
features[i].setStyle(
styles[styleKeys[Math.floor(Math.random() * styleKeys.length)]]
);
}
const source = new VectorSource({
features: features,
});
const vectorLayer = new VectorLayer({
source: source,
});
const map = new Map({
layers: [vectorLayer],
target: 'map',
view: new View({
center: [0, 0],
zoom: 2,
}),
});
const colors = ['blue', 'green', 'yellow', 'aqua', 'red'];
let currentColor = 0;
document.getElementById('color-changer').addEventListener('click', function () {
styles.square
.getImage()
.setFill(new Fill({color: colors[currentColor % colors.length]}));
vectorLayer.changed();
currentColor++;
});
|
)
