Scaling images with GRRLIB_DrawImg has strange effects on images position... I spend a lot of time understandig what follows.

Suppose you have an image 64x64 pixel if you do:
GRRLIB_DrawImg(320, 240, image, 0, -1, -1, WHITE);
the image will be displayed in the area (257,177)-(320,240): in this case (x,y) is the bottom right corner of the image

If you do:
GRRLIB_DrawImg(320, 240, image, 0, -1, 1, WHITE);
happens the same as above

If you do:
GRRLIB_DrawImg(320, 240, image, 0, 1, -1, WHITE);
the display area becomes (320,240)-(383,303)

If you do:
GRRLIB_DrawImg(320, 240, image, 0, 1, 0.5, WHITE);
the image will be displayed in the area (320,272)-(383,303): in this case (x,y) is not a corner of the image

I don't know if this behaviors are intentional or not, but it would be much easier for us if (x,y) were always the top left of the image

Last edited by michelinux (2009-10-28 17:20:58)