My Sketch - OpenProcessing

mySketch
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int numberOfBalls = 500;
float[] ballX = new float[numberOfBalls];
float[] ballY = new float[numberOfBalls];
float[] ballXSpeed = new float[numberOfBalls];
float[] ballYSpeed = new float[numberOfBalls];
color colors[] = new color[numberOfBalls];
​
int ballWidth = 3;
​
void setup() {
  fullScreen();
  smooth();
  background(21);
  colorMode(RGB, width, height, width, 255);//CHANGE MIN MAX OF COLOR MODE
​
  for (int i = 0; i < numberOfBalls; i++) {
    ballX[i] = random(ballWidth, width-ballWidth);
    ballY[i] = random(ballWidth, height-ballWidth);
    ballXSpeed[i] = random(-5, 5);
    ballYSpeed[i] = random(-5, 5);
    //colors[i] = new color(4, 2, 5);
  }
}
​
void draw() {
  noStroke();
  fill(21, 21, 21, 2);
  rect(0, 0, width, height);
​
  fill(255);
​
​
  for (int i = 0; i < numberOfBalls; i++) {
    //fill(colors[i]);
    fill(ballX[i], ballY[i], mouseX, 50);//CHANGED MOUSEX
    ellipse(ballX[i], ballY[i], ballWidth, ballWidth);
​
    isColliding(ballX[i], ballY[i], i);
​
    ballX[i] += ballXSpeed[i];
    ballY[i] += ballYSpeed[i];
  }
}
​
void isColliding(float x, float y, int i) {
  if (x < ballWidth/2) {
    ballXSpeed[i] *= -1;
  }
  if (y < ballWidth/2) {
    ballYSpeed[i] *= -1;
  }
  if (x > width-ballWidth/2) {
    ballXSpeed[i] *= -1;
  }
  if (y > height-ballWidth/2) {
    ballYSpeed[i] *= -1;
  }
​
  for (int j = 0; j < numberOfBalls; j++) {
    if (j != i) {
      //if (dist(ballX[j], ballY[j], x, y) < ballWidth) {
      //  //ballXSpeed[i] *= -1;
      //  //ballYSpeed[i] *= -1;
​
      //  if (ballXSpeed[i] > 0) {
      //    ballXSpeed[i] = abs(ballX[j] - x) * -1 / 10;
      //  }
      //  if (ballXSpeed[i] < 0) {
      //    ballXSpeed[i] = abs(ballX[j] - x) / 10;
      //  }
      //  if (ballYSpeed[i] > 0) {
      //    ballYSpeed[i] = abs(ballY[j] - x) * -1 / 10;
      //  }
      //  if (ballYSpeed[i] < 0) {
      //    ballYSpeed[i] = abs(ballY[j] - x) / 10;
      //  }
​
​
      //  println(dist(ballX[i], ballY[i], x, y));
      //}
    }
  }
}