openlayers/examples/draw-shapes.html

---
layout: example.html
title: Draw Shapes
shortdesc: Using the ol.interaction.Draw to create regular shapes
docs: >
  This demonstrates the use of the `geometryFunction` option for the
  `ol.interaction.Draw`. Select a shape type from the dropdown above to start
  drawing. To activate freehand drawing, hold the `Shift` key. Square drawing is
  achieved by using `type: 'Circle'` type with a `geometryFunction` that creates
  a 4-sided regular polygon instead of a circle. Box drawing uses `type: 'Circle'`
  with a `geometryFunction` that creates a box-shaped polygon instead of a
  circle.  Star drawing uses a custom geometry function that coverts a circle
  into a start using the center and radius provided by the draw interaction.
tags: "draw, edit, freehand, vector"
---
<div id="map" class="map"></div>
<form class="form-inline">
  <label>Shape type &nbsp;</label>
  <select id="type">
    <option value="Square">Square</option>
    <option value="Box">Box</option>
    <option value="Star">Star</option>
    <option value="None">None</option>
  </select>
</form>