Schry - OpenProcessing

mySketch
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//Settings
int squares = 50;     //Total number of squares (minimum = 1)
int speed = 0.5;        //Speed multiplier of the squares (minimum = 1)
int maxSize = 300;    //Max size that a square can be before shrinking (suggested = ~150)
​
int[] x = new int[squares];
int[] y = new int[squares];
int[] s = new int[squares];
int[] xDir = new int[squares];
int[] yDir = new int[squares];
int[] sDiff = new int[squares];
​
void setup() {
  size(screenWidth, screenHeight);
  
  for (int i = 0; i < squares; i++){
    x[i] = random(30, screenWidth - 30);
    y[i] = random(30, screenHeight - 30);
    s[i] = random(10, maxSize - 10);
    sDiff[i] = 1;
    xDir[i] = random(-3, 3) * speed;
    yDir[i] = random(-3, 3) * speed;
    
    if (xDir[i] == 0){
      xDir[i] += 1;
    }
    
    if (yDir[i] == 0){
      yDir[i] += 1;
    }
    
    if (x[i] + s[i] > screenWidth){
      x[i] = screenWidth / 2;
    }
    
    if (y[i] + s[i] > screenHeight){
      y[i] = screenHeight / 2;
    }
    
  }
  background(100);
}
​
void draw() {
  smooth();
  noStroke();
  background(100);
  
  for (int i = 0; i < x.length; i++){
    
    s[i] += sDiff[i];
    
    if(x[i] + s[i] >= screenWidth || x[i] >= screenWidth){
      xDir[i] *= -1; 
      sDiff[i] *= -1; 
    }
    
    if(x[i] <= 0 || x[i] + s[i] <= 0){
      xDir[i] *= -1; 
      sDiff[i] *= -1; 
    }
    
    if(y[i] + s[i] >= screenHeight || y[i] >= screenHeight){
      yDir[i] *= -1; 
      sDiff[i] *= -1; 
    }
    
    if(y[i] <= 0 || y[i] + s[i] <= 0){
      yDir[i] *= -1; 
      sDiff[i] *= -1; 
    }
    
    if (s[i] > maxSize || (s[i] * -1) > maxSize){
      sDiff[i] *= -1;
    }
    
    x[i] += xDir[i];
    y[i] += yDir[i];
    
    if ((i % 3) == 2){
      fill(225, 0, 0)
    }
    
    if ((i % 3) == 1){
      fill(75)
    }
    
    if ((i % 3) == 0){
      fill(3)
    }
    
    rect(x[i], y[i], s[i], s[i]);
    
  }
  
}