xxxxxxxxxx
void setup()
{
size(400, 400);
strokeWeight(6);
colorMode(HSB);
for(int i = 0; i < 360; i++)
{
for (int j = 0; j < ((width/2)*sqrt(2)); j++)
{
stroke(i*255/360, 255, j*255/((width/2)*sqrt(2)));
point(width/2+cos(radians(i))*j, height/2+sin(radians(i))*j);
}
}
}