Forums » Help » Gravity Centre

Hi

Is there anyway of setting the gravity centre?

So all entities currently fall DOWN the screen, say i wanted to move the gravity value so :

1. They fell up the screen.
2. Fell towards the centre of the screen.

and update that dynamically, whats the best route for doing that?

Do you want uniform gravity (same for all entities regardless of location) or local (pulls units towards it)?

I'd like to know how to do both, if possible?

For uniform, change ig.game.gravity at any time in game. Movement calcs will be updated accordingly.

(untried) For localized, I'd use box2d, sensors, and forces. This would allow one to have multiple gravity fields within a scene, with forces applied to bodies in range of one or more fields. You would then set the containing entities' gravityFactor to some value between 0 (full gravity field control) and n (gravity fields and world gravity effects combined).

Oh :-( im not using box2d yet!

So how would i set ig.game.gravity to say, the centre of the screen?

Bypassing box2d, then... if you only need one center of gravity (cog), then you'll need to apply gravity acceleration to each entity, setting its accel property accordingly, as it gets pulled towards the cog. Someone ought to do a plugin for this... ;)

paulh, may be too late but in case you still need it, I just posted a local gravity plugin in Code section. FMI check blog.