Hopefully someone can help me..I'm creating a very simple shooting game for university..i have two balls moving on different axis. When they collide i would like something simple to happen...say very simple explosion of sorts..If anyone could explain how i could do this please...below is my cod..
cheers

float x =50.0;
float speed = 1.0;
float radius = 15.0;
int direction = 1;
float y =500.0;
boolean fire = false;
float bulletSpeed = 1.0;
int bulletDirection = 1;

void setup(){
 size(500,500);
 smooth();
 noStroke();
 ellipseMode(RADIUS);
}

void draw(){
 fill(255);
 background(0);
 ellipse(x,33,radius,radius);
 x+=speed*direction;
 if((x>height-radius)||(x<radius)){
   direction=-direction;
 }
 if(fire==true){
   ellipse(250,y,5,5);
   y-=bulletSpeed*bulletDirection;
 }
 
 
 
}
   


void mousePressed()
{
   fire = true;
}