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Page: System
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3 System
Nick Winter edited this page 2014-01-05 13:51:34 -08:00

In our Thang Component System architecture, the Systems fulfill three roles.

  1. Systems are unto Levels as Components are unto Thangs. For example, if I want my Level to have gravity, I add the Movement System and configure its gravity to 9.81 m/s^2.
  2. They also serve as namespaces for the Components. As an example, the Physics System doesn't actually do anything on its own yet, but it was a good place to put physics.Physical Component, which controls the size, shape, rotation, and position of all physical Thangs.
  3. They can coordinate behavior across those Components. For example, the Collision System will look at all the Thangs which have the collides property set and update its Box2D-based collision simulation once per frame, instead of each Thang with a Collides Component trying to figure out its own collision interactions.

Example: the Movement System

You can also live-edit the code for any System directly within the Systems tab of the Level editor, just like in the Component example. The same caveat applies: because we don't yet safely sandbox System code and haven't quite finished those permissions, you can't actually edit System yet as a non-admin. So to edit them and add new ones, [install the local server](Developer Environment) and create a local account there, which will automatically be an admin account. Then [send us](Developer Organization) the System edits for review and addition to the live site.

To see all the entity data for, say, the Movement System, I can just go to http://localhost:3000/db/level_system/movement.

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