//bounce
float a;
float b;
float x;
float y;
float x_direction;
float y_direction;
float a_direction;
float b_direction;
float x_speed;
float y_speed;
float a_speed;
float b_speed;

void setup(){
  size(300,300);
  x_direction=1;
  y_direction=1;
  a_direction=1;
  b_direction=1;
  x_speed=2.1;
  y_speed=2.9;
  a_speed=1.1;
  b_speed=6.9;
}

void loop(){
  x=x+x_direction*x_speed;
  y=y+y_direction*y_speed;
  background(255,255,255);
 
   ellipse(x,y,30,30);
  
  if(x>300-30  ){
    x_direction=-1;
  }
  if(x<0  ){
    x_direction=1;
 }
 if(y>300-30){
   y_direction=-1;
 }
if(y<0){
   y_direction=1;
 }
  a=a+a_direction*a_speed;
  b=b+b_direction*b_speed;
ellipse(230-a,b,70,70);
  if(a>300-70){
    a_direction=-1;
  }
  if(a<0  ){
    a_direction=1;
 }
 if(b>300-70){
   b_direction=-1;
 }
if(b<0){
   b_direction=1;
 }
}