Genesis of an imaginary world

class Cloud{

 float xpos;

 float ypos;

 float speed;

 PImage p;

 Cloud(float x, float y, float speed_, PImage p_){

   xpos=x;

   ypos=y;

   speed = speed_;

   p = p_;

 }

 void move(){

   xpos =  xpos+speed;

   if(xpos > width+p.width){

     xpos = 0-p.width;//how to control x

     ypos  = ypos+random(-100,100);//update y each time cloud leaves the screen

     println(ypos);

   }

​

 }

 void display(){

   image(p,xpos, ypos);

 }

}

​