midpoint algorithm for parabola

I have for the past few days been trying to work on the derivation of a
Bresenham algorithm on a parabola. yet it just seems that everything I
come up yields me a straight line.

int x = 0, y = 0, d = 0;
for(x=0,y=0; x<100; x++) {
setPixel(x,y);
d+=2*x+1;
if(d>=0) {
y++;
d--;
}
}

This code always yields a straight line, and I cannot figure out why. I
have even look at other derivations of a parabola. I was wondering what
I could be doing wrong? Anyone have any suggestions or insights. I
would write more, but the derivation can be found at multiple
locations, but if someone has some working code that I could view that
would be even better.

.

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