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Regular Shapes

vector63 symbol2 regularshape1 style17 square1 rectangle1 cross1 star1 triangle1 x1

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 'ol/ol.css';
import Feature from 'ol/Feature';
import Map from 'ol/Map';
import Point from 'ol/geom/Point';
import VectorLayer from 'ol/layer/Vector';
import VectorSource from 'ol/source/Vector';
import View from 'ol/View';
import {Fill, RegularShape, Stroke, Style} from 'ol/style';

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,
  }),
});
index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Regular Shapes</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep"></script>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder,Number.isInteger"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>
package.json
{
  "name": "regularshape",
  "dependencies": {
    "ol": "6.6.1"
  },
  "devDependencies": {
    "parcel": "^2.0.0-beta.1"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}