Render geometries to a canvas

Example of rendering geometries to an arbitrary canvas.

This example shows how to render geometries to an arbitrary canvas.

<!DOCTYPE html>
<html>
  <head>
    <title>Render geometries to a canvas</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>

  </head>
  <body>
    <canvas id="canvas"></canvas>
    <script>
      import {LineString, Point, Polygon} from 'ol/geom.js';
      import {toContext} from 'ol/render.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';


      var canvas = document.getElementById('canvas');
      var vectorContext = toContext(canvas.getContext('2d'), {size: [100, 100]});

      var fill = new Fill({color: 'blue'});
      var stroke = new Stroke({color: 'black'});
      var style = new Style({
        fill: fill,
        stroke: stroke,
        image: new CircleStyle({
          radius: 10,
          fill: fill,
          stroke: stroke
        })
      });
      vectorContext.setStyle(style);

      vectorContext.drawGeometry(new LineString([[10, 10], [90, 90]]));
      vectorContext.drawGeometry(new Polygon([[[2, 2], [98, 2], [2, 98], [2, 2]]]));
      vectorContext.drawGeometry(new Point([88, 88]));
    </script>
  </body>
</html>