GP32 Sprite Rotation

[unlucky]

Is there any very simple way to do sprite rotation "_" i know the gp32 has no hardware for this so i'm guessing it'll be fully software anyone have any kind of header library thing to do it apart from sdl ( i find sdl scary lol ) thanks in advance

 

[don]

Here's a tutorial:

http://echellon.hybd.net/issues/5/articles/circle/sincos.htm

Personally, I couldn't follow it, I'm too crappy at maths.
Mr. Spiv has some Sprite rotation code on his homepage, haven't had a look at it, though.

 

[unlucky]

yeah the stuff at the beginning is pretty good and useful for the game i think i'll make but by the time i get the sprite rotation its got pretttyyy madd : )
Is sprite rotation slow would i just be better off having just 8 different sprites making the angles a bit weird but just dealing with it : )

 

[don]

Well, I'm not too sure about that. Mode7 stuff is based on rotozooming and sprite-rotation, too. So if your code is not a complete mess, i think real-time rotating sprite shouldn't be a problem.

 

[Arda]

don'T forget to check spiv's site.

it has a cool sprite rotation code with some asm support. but limited to 64x64 I guess. (but I'm not sure of it)

http://www.deadcoderssociety.tk

 

[unlucky]

had a look at it as i'm pretty new 2 coding ( new developors help ) this is all a bit crazy so i think i'll just do it the simple way

 

[generalnmx]

Do you want to just flip the image horizontally or vertically, or do real-time sprite rotation? The latter would be difficult, but flipping is relatively easy. You could just make a new surface with the correct dimensions AFTER flipping and move the pixels one-by-one. You could also do this with real-time sprite rotation, but it would be painfully slow and you'd have to do a lot of trial-and-error to get it to work with diagonal angles.

 

[unlucky]

I think i'll just forget about it : )