Simple movement with P2 and my character rotates

[TheSisb]

My game: http://antipeasantry.com/PhaserGame/index.html

 

If I move my character to the bottom left corner of the world and start banging into the edge then moving back out while (Somewhat) wildly mashing on directional keys, the sprite begins to rotate ever so slightly.

 

I want to keep it locked to 8 directions: left, topleft, top, topright, right, bottomright, bottom, bottomleft and avoid any rotations.

 

Any advice is appreciated! Thanks

[TheSisb]

Image of rotated character: http://imgur.com/mg9GIhK

[mattstyles]

I can replicate your problem, looks like angular velocity has been added to your physics body, and it also looks like there is no damping force to stop it.

 

Further, it looks like maybe the problem is the collision. When objects collide friction (and some other stuff) causes angular forces to be exerted upon them, these forces are usually dissipated by damping forces in simulations.

 

So, I think a couple of things, or a combination of them, might help you out:

 

Whack up the `angularDamping` to 1 (I think that is max), which means thats any angular momentum is immediately damped to 0.

Check out your `contactMaterials`, the contact materials set some factors of what happens when different materials collide, setting friction to 0 or 1 (min or max, I cant remember which way round you need).

 

Oh, for some reason I assumed you were using P2 for physics, Phaser supports other physics engines, I only have working knowledge of p2 but its quite possible the theory remains for the other 2 phaser implements (ninja and arcade I think)

[TheSisb]

I'll try this out! Thanks for the advice  

[TheSisb]

This example helped solve it: http://www.phaser.io/examples/v2/p2-physics/basic-movement

 

Key lines:

sprite.body.setZeroDamping();

sprite.body.fixedRotation = true;