Hi. I want to make the eruption effect, that if the ball of y location goes to the ground, to split into half and bounce. I can make the ball to get smaller and bounce, but when i tried to make another ball to make it split, it goes out of array index. But I don't know how to solve. Could you give any help or idea? Thank you.

I will post the code. For the part that keep falling out of array, i put // so that it won't show any error if you played it. You should click mouse for make balls.




int numballs=10000;
float[] locx=new float[numballs];
float[] locy=new float[numballs];
float[] ma=new float[numballs];
float[] speedx=new float[numballs];
float[] speedy=new float[numballs];
int ball_length;
int ball_lengthp;
Balls[] ball=new Balls[numballs];

boolean play=false;
 float t,tt;
 
void setup()
{
 t=0;
 tt=0.2;
 size(500,500);
 background(0);
}

void draw(){
t+=tt;
 fill(0,20);
 rectMode(CORNERS);
 rect(width,height,0,0);
 if(play){
  ball_length++;
  ball[ball_length] = new Balls(mouseX,mouseY,random(-.5,.5),1,10);
 }

 for (int i = 1; i < ball_length+1+ball_lengthp; i++) {
   
  if(ball[i].y>height-100){
  ball[i] = new Balls(ball[i].x,ball[i].y,ball[i].xspeed/2,ball[i].yspeed*-1,ball[i].ma/2);
    //ball_lengthp++;
    //ball[ball_length+ball_lengthp] = new Balls(ball[i].x,ball[i].y,-ball[i].xspeed/2,ball[i].yspeed*-1,ball[i].ma/2);  
 }
    ball[i].move();
   ball[i].display();
 }
 }


void mousePressed(){
  play=true;  
}

 void mouseReleased(){
   play=false;
 }
 

class Balls{
 float x=250;
 float y=250;

 float ma;
 float xspeed;
 float yspeed;

 Balls(float xloc,float yloc,float speedx,float speedy,float mass) {
   x=xloc;
   y =yloc;
   xspeed = speedx;
   yspeed = speedy;
   ma=mass;
 }


 void move() {

   yspeed+=1;
    x+=xspeed;
   y +=yspeed;

   if(x>width-100){
    xspeed*=-1;    
  }  
 }

 void display() {
   fill(255);
   noStroke();
   ellipse(x,y,ma,ma);
 }
}