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#1 2009-01-22 16:38:32
- spiffen
- Member
Draw part of image function
I was wondering if anyone have created a function that can take x, y, width, height of source image and x and y of the destination (screen) when drawing an image?
A function like this:
void GRRLIB_DrawImg(f32 xpos, f32 ypos, f32 source_xpos, f32 source_ypos, u16 width, u16 height, u8 data[], float degrees, float scaleX, f32 scaleY, u8 alpha);
Example: You have an image that is 10 x 10 pixels, and only want to draw an area of 2 x 2 pixels located at the bottom right part of the source image to coordinates 0,0 on the screen, then you call the function like this:
GRRLIB_DrawImg(0, 0, 8, 8, 2, 2, image, 0, 1, 1, 255);
Would be nice to have a function like that..
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#2 2009-01-22 17:44:28
- Crayon
- Bad Mother Fucker
Re: Draw part of image function
Maybe the GRRLIB_DrawTile function would work for you check this page: http://grrlib.santo.fr/wiki/wikka.php?wakka=Day6
Useful links: libOGC Documentation, libOGC Repository, GRRLIB Documentation, GRRLIB Repository, #GRRLIB on IRC
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#3 2009-01-27 09:51:50
- JustWoody
- Member
Re: Draw part of image function
I did something similar for a flag waving effect for language selection in Mahjongg Wii, but I found that I has some corruption with parts of the image nearer the bottom. I figured out that I had to change the GGRLIB_DrawTile function slightly so that the tile number that you want to choose was a bigger variable type and this fixed it.
The original DrawTile function only supported one row of tiles, so I also changed it to support any amount of rows and columns (as long as the image does not go over 1024 for x or y pixels)
When I get home (if I remember 
) I will post my version on here
The only other thing is that the tiles have to be multiples of 4 so your idea of 2x2 would not be possible
Last edited by JustWoody (2009-01-27 10:19:43)
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#4 2009-01-27 16:52:37
- NoNameNo
- Administrator
Re: Draw part of image function
hi,
The svn version support 1024x1024 tileset.
no more glishes at the middle of the screen, and lot of more
Check it now !! and enjoy !! 
http://code.google.com/p/grrlib/source/checkout
ps: the tiles do not have to be a multiple of 4, only the tileset does.
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#5 2009-02-06 14:20:32
- spiffen
- Member
Re: Draw part of image function
Ohhhh, is it so. That is really good to know. Then I guess I could use the DrawTile function 'Crayon' mentioned earlier in this thread.
Perhaps I'll write a new function that is compatible with the "new" GRRLIB version, since I use the SVN version now..
NoNameNo wrote:
ps: the tiles do not have to be a multiple of 4, only the tileset does.
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