E8

int x = 1;

int h = 0;

int b = 90;

​

void setup() {

​

size(500,500);

}

​

void draw() {

 colorMode(HSB, 500);

 background(h, 300, b-80);

 noStroke();

 fill(h, 500, b);

 ellipse(height/2, width/2, x, x); 

 if (mousePressed && mouseButton==LEFT) {x=x+2; h=h+2; b=b+2;}

 else if (mousePressed && mouseButton==RIGHT) {x=x-2; h=h-2; b=b-2;}

 if (x>height) {x=1; h=b=0; ellipse(height/2, width/2, x, x);}

}