Rainbow Dots - OpenProcessing

mySketch
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//RAINBOW CIRCLES APPEARING RANDOMLY
float circleX;
float circleY;
float randomRadius;
float numPressed = 0;
​
void setup() {
  size(1280, 600);
  background(0);
}
​
void draw() {
  circleX = random(width);
  circleY= random(height);
  randomRadius = random(50);
  noStroke();
  fill(random(0,255), random(0,255), random(0,255), random(0,255), random(30, 100));
  ellipse(circleX,circleY,randomRadius,randomRadius);
}
​
void mousePressed() {
  numPressed += 1;
  if (numPressed == 1) {
    background(255);
  } else if (numPressed % 2 == 0) {
    background(0);
  } else {
    background(255);
  }
}