James Milner

If you have ever had the experience of having to write code to draw on web maps, you'll know how painful the process can be - especially when situations get more complex. Terra Draw is an open source JavaScript library that provides a new way to add drawing functionality to a host of web mapping libraries, including Leaflet, OpenLayers, Google Maps, MapboxGL JS and MapLibreGL JS. The library provides a selection of built in modes that 'just work' across different mapping libraries. These features include elementary drawing tools like point, line and polygon, as well as supporting more advanced concepts like snapping, rotation and scaling. Terra Draw is also designed to be extendable so that you can write your own custom modes and adapters (thin wrappers for each mapping library). The architecture of the library means that any mode work can work with any adapter and vice versa creating a strong multiplier affect as new modes and adapters are written. This decoupling has the added benefit that drawing libraries can be swapped out without breaking your app! The talk will examine the history of the library, how to get started, and also an opportunity to hear more about the future of Terra Draw.

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