RGB With Gravity

int RED_PIN = 3;
int GREEN_PIN = 6;
int BLUE_PIN = 11;
int MAXSPEED = 255;
int SPEEDPAD = 80;

int tick = 1;
int rSpeed = 0;
int rval = 0;
int rGoal = 0;

int gSpeed = 0;
int gval = 0;
int gGoal = 0;

int bSpeed = 0;
int bval = 0;
int bGoal = 0;

void setup() {  
  
  rGoal = random(255);
  gGoal = random(255);
  bGoal = random(255);
  
  rSpeed = newSpeed();
  gSpeed = newSpeed();;
  bSpeed = newSpeed();
  
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}



void loop() {
  if (tick % rSpeed == 0) {
     if (rval == rGoal) {
       rGoal = random(255);
       rSpeed = newSpeed();
     } else if(rval < rGoal) {
       rval++;
     } else { rval--; }
     analogWrite(RED_PIN, rval);
   }
   if (tick % gSpeed == 0) {
     if (gval == gGoal) {
       gGoal = random(255);
       gSpeed = newSpeed();
     } else if(gval < gGoal) {
       gval++;
     } else { gval--; }
     analogWrite(GREEN_PIN, gval);
   }
   if (tick % bSpeed == 0) {
     if (bval == bGoal) {
       bGoal = random(255);
       bSpeed = newSpeed();
     } else if(bval < bGoal) {
       bval++;
     } else { bval--; }
     analogWrite(BLUE_PIN, bval);
   }
  tick++;
}
int newSpeed() {
  return random(MAXSPEED) + SPEEDPAD;
}
void writeRGB(int r, int g, int b) {
  analogWrite(RED_PIN, r);
  analogWrite(GREEN_PIN, g);
  analogWrite(BLUE_PIN, b);
  delay(1);
}