Button and 50+ Balls - OpenProcessing

mySketch
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//Balls
//Amount of balls
int balls = 55;
//Variables
float [] ballsX = new float [55]; //Position X
float [] ballsY = new float [55]; //Position Y
float [] ballsSY = new float [55]; //Speed Y
float [] ballsSX = new float [55]; //Speed x
float ballsW;
​
//Button
float bX, bY, bW;
​
//Ball bouncing off button
boolean ballbounce = false;
​
​
void setup (){
  size (150 , 150);
  //Button position
  bX = 50;
  bY = 50;
  bW = 50;
  //Ball size
  ballsW = 5;
  //Balls positions
  for (int x1 = 0 ; x1 < ballsX.length; x1++) {
     ballsX[x1] = random(height);
     ballsSX[x1] = 1;
   }
   for (int y1 = 0; y1 < ballsY.length; y1++) {      
     ballsY[y1] = random(height); 
     ballsSY[y1] = 1;
   }
}
​
void draw (){
  //Background change when balls bounce on button
  if (ballbounce) {
    background (255 , 191 , 254); //Bright astel pink
  } else {
    background (245 , 191 , 254); //Bright pastel purple
  }
  //Button
  fill (0);
  noStroke ();
  rect (bX , bY , bW , bW);
  //Balls
  for (int i = 0; i < ballsY.length; i++) { //Loop
    stroke(0,((int)random(255)),0); //Random colours in green spectrum
    fill(0,((int)random(255)),0); //Random colours in green spectrum
    ellipse (ballsX[i], ballsY[i], ballsW, ballsW);
    ballsY[i] = ballsY[i] + ballsSY[i]; //Movement in Y
    ballsX[i] = ballsX[i] + ballsSX[i]; //Movement in X
  //Balls touching button
  if (( ballsY[i] > bY-ballsW) && ( ballsY[i] < bY+bW+ballsW) && (ballsX[i] > bX-ballsW) && (ballsX[i] < bX+bW+ballsW)) { 
    ballbounce = !ballbounce;
  //Balls bouncing in different directions
  if ((ballsY[i] < bY) || (ballsY[i] > bY+bW)) {
    ballsSY[i] = ballsSY[i] * -1;
  } else if ((ballsX[i] < bX) || (ballsX[i] > bX+bW)) {
    ballsSX[i] = ballsSX[i] * -1;
  }
 }
  //Balls bouncing on walls
  if (( ballsY[i] > height) || ( ballsY[i] < 0)) {
    ballsSY[i] = ballsSY[i] * -1;
  }
  if ((ballsX[i] > width) || (ballsX[i] < 0)) {   
    ballsSX[i] = ballsSX[i] * -1;
  }
 }
}