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  [Phys2D] Change rotation center of a Box  (Read 1914 times)
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Offline provenza24

Senior Newbie


Projects: 1



« Posted 2008-07-17 22:29:03 »

hi,

i'm new in using the Phys2D library
I 'd like to know how to change (if it's possible) the center of the rotation of a box
by default, the center of a box rotation is the box's center itself
i'd like to change it

thanx .... !
Offline Bonbon-Chan

JGO Coder


Medals: 12



« Reply #1 - Posted 2008-07-18 08:54:34 »

Objects rotate around their mass center. It is physic. So the rotation center can not be change.
But if you want to rotate a shape (for example a car), when you apply a force on a objet it is always on the mass center in Phys2D. You will have to add a dummy object (low mass, no collision, fixed joint) to your object, then apply a force on the dummy object (it can be tricky).
Online kevglass

JGO Kernel


Medals: 120
Projects: 23
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2008-07-20 20:23:34 »

Alternatively you could create a box shaped polygon around any center point. Whether it'll behave as with a normal box I'm not sure.

You could take a look at JBox2D, I think the new engine supports arbitrary centre of rotations? It certainly has more consistent polygon support.

Kev

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