Track amount of times mouse has clicked and change sketch. More than a switch....

click count sketch.pde

// declare int variable
int clickcount = 0;

void setup(){
 size(500,500);
 background(0);
}

void draw(){ 
  
  
  // Conditional colors
  if(clickcount == 0){
    background(255,0,0); // red
  } if (clickcount == 1){
    background(255); // white
  } if (clickcount == 2){
    background(255,0,255); // magenta
  } if (clickcount >=3){
    background(random(255));
  }
  
  // Draw the circle
  //background(0); //make it black!
  // make a circle that wont go away
  noStroke();
//  fill(255);
  ellipse(mouseX,mouseY,30,30);

  println("Click count is: " + clickcount);

  
  

} //draw

void mouseReleased(){
     clickcount = clickcount + 1; 
}