#### Regular Shapes

Example of some Regular Shape styles.

This example shows how several regular shapes or symbols (representing `x`, `cross`, `star`, `triangle`, `square` and `stacked`) can be created. A `rectangle` is produced by scaling a square created without rotation. Style `stacked` represents possility to stack multiple shapes with offset

##### main.js
``````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,
angle: Math.PI / 4,
}),
}),
'rectangle': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
angle: 0,
scale: [1, 0.5],
}),
}),
'triangle': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 3,
rotation: Math.PI / 4,
angle: 0,
}),
}),
'star': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 5,
angle: 0,
}),
}),
'cross': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
angle: 0,
}),
}),
'x': new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
angle: Math.PI / 4,
}),
}),
'stacked': [
new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
angle: Math.PI / 4,
displacement: [0, 10],
}),
}),
new Style({
image: new RegularShape({
fill: fill,
stroke: stroke,
points: 4,
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;

styles.square
.getImage()
.setFill(new Fill({color: colors[currentColor % colors.length]}));
vectorLayer.changed();
currentColor++;
});
``````
##### index.html
``````<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>Regular Shapes</title>
<style>
.map {
width: 100%;
height: 400px;
}
</style>
<body>
<div id="map" class="map"></div>
<div>
<button id="color-changer">Change Square Colors</button>
</div>

<script type="module" src="main.js"></script>
</body>
</html>``````
##### package.json
``````{
"name": "regularshape",
"dependencies": {
"ol": "9.2.4"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}``````