Well here I am, trying to rotate a bitmap . I remembered seeing a library called "rotozoom" on the main SDL page, but it only works with Linux (supposedly).
So what am I supposed to do? Write my own function? If so, how? Is there a function in SDL that I can use (I don''t see any in the Doc Project).
I feel pretty wierd asking a question like this, newbyish? I''m used to glRotatef(), so I''m pretty stumped here.
Thanks for any responses.
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Simple DirectMedia Layer: Main Site - (www.libsdl.org)
Cone3D Tutorials- (cone3D.gamedev.net)
GameDev.net''s Tutorials - (Here)
OpenGL: Main Site - (www.opengl.org)
NeHe Tutorials - (nehe.gamedev.net)
Online Books - (Red Book) (Blue Book)
------------------------------Put THAT in your smoke and pipe it
Yeah Readleaf - that''s what I''m using. Drizzt, this library (SDL_gfx) contains a rotozoomSurface() function that you can use in Windows - I''ve used it sucessfully. It''s nothing complex, but email me if you run into any problems. Just be sure to #include "sdl_rotozoom.h" as well as place the sdl_rotozoom.c in your project so you don''t get nasty link errors
for (x,y) = pixel on the target bitmap T figure out (x0,y0) whence in the source bitmap S the pixel T(x,y) comes from ( e.g. x0 = cos(-angle)*x, y0 = sin(-angle)*y, if you arer centered at (0,0) ) plot the pixel at T(x,y) with the color from S(x0,y0), possibly with supersampling (e.g. averaging the neighbouring colors)
"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan
quote:Original post by Gaiiden Yeah Readleaf - that's what I'm using. Drizzt, this library (SDL_gfx) contains a rotozoomSurface() function that you can use in Windows - I've used it sucessfully. It's nothing complex, but email me if you run into any problems. Just be sure to #include "sdl_rotozoom.h" as well as place the sdl_rotozoom.c in your project so you don't get nasty link errors
The problem here is that it still uses SDL_rotozoom. SDL_gfx just has SDL_rotozoom as part of it, and SDL_rotozoom only works for Linux. Or is the rotozoom in SDL_gfx completely different?
[EDIT] - looked at SDL_rotozoom.c: They include "windows.h" in SDL_rotozoom.c. This means that the rotation will only work in windows correct? [/EDIT]
quote:Original post by Drizzt DoUrden The problem here is that it still uses SDL_rotozoom. SDL_gfx just has SDL_rotozoom as part of it, and SDL_rotozoom only works for Linux. Or is the rotozoom in SDL_gfx completely different?
[EDIT] - looked at SDL_rotozoom.c: They include "windows.h" in SDL_rotozoom.c. This means that the rotation will only work in windows correct? [/EDIT]
Yeah, but you''ll notice that they encase the windows include in an #ifdef directive, so that only if the code is being used on a Win32 platform is the header included. Will you just go ahead and use it already?? It works! Yeesh, hee hee
. I remembered seeing a library called "rotozoom" on the main SDL page, but it only works with Linux (supposedly).
So what am I supposed to do? Write my own function? If so, how? Is there a function in SDL that I can use (I don''t see any in the Doc Project).
I feel pretty wierd asking a question like this, newbyish? I''m used to glRotatef(), so I''m pretty stumped here.
Thanks for any responses.
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Simple DirectMedia Layer:
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