void setup(){
colorMode(HSB, 255);
size(400, 400);
background(0,0,0);
stroke(38,255,255);
strokeWeight(20);
smooth();

}

int mrX = 0;
int mrHue = 0;
int mrdot = 20;
void draw(){
strokeWeight(mrdot);
background(mrHue,100,255);
point(mrX, 200);
mrX = mrX + 3;
mrHue = mrHue + 1;
mrdot = mrdot + 1;
if (mrX > 400){
  mrX = 0;
}
if (mrHue > 255){
  mrHue = 0;

}
if (mrdot > 320){
  mrdot = 0;

}
}