DSDN 142 -Finally collision!!

YAAAAAAAAAAAY :) Now time to introduce this to my main code.

CODE:
int ball = 20;
int ball2 = 20;
float xpos = 0;
float ypos = 230;
int xdirection = 1;
void setup(){
  size(500,500);
  smooth();
}
void draw(){
  background(0);
 
  xpos = xpos + xdirection;
 
  if(xpos > 470){
  xdirection = xdirection * - 1;
  }
    if(xpos < 0){
      xdirection = xdirection * -1;
     
    }
      if(dist(ball,xpos,ball2,ypos) <15){
        xdirection = xdirection * -1;
}
ellipse(xpos+ball, ypos+ball,ball,ball);
ellipse(ypos+ball2, xpos+ball2,ball2,ball2);
fill(255);
}

So now I have finally figured how to make them collide and reflect off each other. And now it turns out it was really simple :/ But now I understand it completley and ready to explore more in my code.