Draw an ellipse with pixels only

Draw an ellipse with pixels only (i.e not with the ellipse() function)

/*
E.Dare August 2011
Draw an ellipse with pixels only
*/

int x = 150;
int y =150;
float radius =80;

void setup() {
size(300, 300);
}

void draw() {
background(255);


color col2 = color(0, 0, 255);


//if i and j are within half radius width of x and y (centre) fill with blue
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if ((dist(i, j, x, y)<=radius/2)) {
set(i, j, col2);
}
}
}
}

Had a paper accetped for this conference, Staging Illusion with key note from none other than my old doctoral supervisor (I mean supervisor of old) Sarah Kember. Cooool. :-)