This really smells like a rookie mistake to me, so I felt this belonged best in the beginners' forum.
The relevant code in question is as follows:
const float rot = 45;
float cos_v = cos(rot*D2R);
float sin_v = sin(rot*D2R);
for(int x=-6; x <= 6; x += 1)
{
for(int y=-6; y <= 6; y += 1)
{
float fx = x*32;
float fy = y*32;
int dx = (int)(cos_v * fx - sin_v * fy);
int dy = (int)(cos_v * fy + sin_v * fx);
pgm->render(SCR_WIDTH/2+dx, SCR_HEIGHT/2+dy);
}
}
Where D2R is (pi / 180) and pgm->render(x,y) draws a centred image at the given coordinates. This is a general case with the rotation fixed, but I'm sure the idea is clear.
Much to my dismay, this results in a series of small off-by-one errors in rendering:
I'm guessing that these are rounding errors, as a result of the multiplications with my precomputed sin/cos values. Or is there something else of a clear-as-day fashion that's just completely missed me? [grin]
Many thanks in advance for any assistance.
[Edited by - HopeDagger on July 19, 2008 6:50:27 PM]
