float f=4;
float fps=4*f;

void setup(){
  size(500,500);
  frameRate(fps);
}

void draw(){
  background(200);
  fill(0);
  text("frekvenca vzorčenja= "+fps,0,10);
  text("frekvenca= "+f,0,20);
  fill(255);
//  println(f);
  translate(width/2,height/2);
  rotate(radians(int(f*360/fps*frameCount)));
  ellipse(0,0,200,200);
  line(0,0,0,-100);
}

void mousePressed(){
   f=round(map(mouseX,0,width,0,fps));
}