int maxBalls=90;
float[] x = new float[maxBalls];
float[] y = new float[maxBalls];
float[] xPlus = new float[maxBalls];
float[] yPlus = new float[maxBalls];
boolean spawn=false;
boolean repeat=true;
int click=0;
int count=0;

void setup() {
  //fullScreen();
  size(700, 500);
}

void draw() {
  background(#FFFFFF);
  fill(#000000);
  ball();
  text("FPS: " + frameRate, 1, 10);
  text("Balls: " + click, 1, 20);
  if (click==maxBalls) {
    repeat=false;
  }
}

void mousePressed() {
  if (repeat) {
    spawn=true;
    x[click] = mouseX;
    y[click] = mouseY;
    xPlus[click]=random(-10, 10);
    yPlus[click]=random(-10, 10);

    click++;
  }
}

void ball() {
  if (spawn) {
    ellipse(x[count], y[count], 30, 30);
    x[count]=x[count]+xPlus[count];
    y[count]=y[count]+yPlus[count];
  }
  if (x[count]<=15 || x[count]>=width-15) {
    xPlus[count]=xPlus[count]*(-1);
  }
  if (y[count]<=15 || y[count]>=height-15) {
    yPlus[count]=yPlus[count]*(-1);
  }
  count++;
  if (count>=click) {
    count=0;
  } else {
    ball();
  }
}

void keyPressed() {
  if (key=='r') {
    click=0;
  }
}