Java-Gaming.org Hi !
Featured games (81)
games approved by the League of Dukes
Games in Showcase (513)
Games in Android Showcase (119)
games submitted by our members
Games in WIP (576)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  [Phys2D] Change rotation center of a Box  (Read 1958 times)
0 Members and 1 Guest are viewing this topic.
Offline provenza24

Senior Newbie


Projects: 1



« Posted 2008-07-17 20:29:03 »

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 06:54:34 »

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).
Offline kevglass

JGO Kernel


Medals: 186
Projects: 24
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2008-07-20 18:23:34 »

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

Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

Longarmx (39 views)
2014-10-17 03:59:02

Norakomi (30 views)
2014-10-16 15:22:06

Norakomi (24 views)
2014-10-16 15:20:20

lcass (28 views)
2014-10-15 16:18:58

TehJavaDev (57 views)
2014-10-14 00:39:48

TehJavaDev (58 views)
2014-10-14 00:35:47

TehJavaDev (48 views)
2014-10-14 00:32:37

BurntPizza (64 views)
2014-10-11 23:24:42

BurntPizza (36 views)
2014-10-11 23:10:45

BurntPizza (78 views)
2014-10-11 22:30:10
Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!