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Chipmunk Physics • View topic - Drawing boxes correctly and no displaced.
Page 1 of 1

Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 7:34 am
by .teri
Hello. Please, I need help.
I create a box (a shape) with cpBoxShapeNew. Ok, fine. The problem is when I draw it with SFML. The graphic is displaced right-bottom from the body. Very odd. With circles, poly and segments all ok. Any advice? Thanks.

Re: Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 9:25 am
by slembcke
How are you drawing them? Need a bit more to go on then that.

Re: Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 1:27 pm
by .teri

Re: Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 2:21 pm
by pat
not sure if this is it, But cpBoxShapeNew will make the box centered. So if its like the bottom right of the image is drawing at the origin (so cpBoxShapeNew(20,20) would be -10 to +10 in each direction), then when your calling sfShape_SetPosition or whatever, you'd need to do pos.x - givenWidth/2, pos.y - givenHeight/2 . Or maybe i'm not understanding the issue.

Re: Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 6:32 pm
by .teri
You are right Pat. Aparently your solution works until the body start to rotate... When the body rotate the image starts to displace. Anyway thanks.

I've attached two images for see better the issue. bd2.png is the object rotated 180 ยบ. bd1 a few degrees.

Re: Drawing boxes correctly and no displaced.

PostPosted: Thu Sep 30, 2010 10:32 pm
by jason_rogers
if your having issues with the other shapes you can look at the drawObject method in the examples

if your using opengl or any matix based display you can use this coed snipet
http://code.google.com/p/chipmunk-physi ... ulSnippets

Re: Drawing boxes correctly and no displaced.

PostPosted: Fri Oct 01, 2010 10:24 am
by pat

Re: Drawing boxes correctly and no displaced.

PostPosted: Fri Oct 01, 2010 6:11 pm
by .teri