Example of using the ol.interaction.Draw interaction.
Example of using the Draw interaction. Select a geometry type from the dropdown above to start drawing. To finish drawing, click the last point. To activate freehand drawing for lines and polygons, hold the Shift
key. Square drawing is achieved by using Circle mode with a geometryFunction
that creates a 4-sided regular polygon instead of a circle. Box drawing uses a custom geometryFunction
that takes start and end point of a line with 2 points and creates a rectangular box.