expanding boxes - OpenProcessing

mySketch
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int numOfBoxes = 30;
Box[] boxes = new Box[numOfBoxes];
float pressedX = 250;
float pressedY = 250;
float B=150;
float G=150;
​
void setup(){
  size(500,500);
  noStroke();
  rectMode(CENTER);
  for(int i =0; i<boxes.length;i++){
    boxes[i] = new Box();
  }
  frameRate(10);
}
​
void draw(){
  background(0);
  float newSize = 1000;
  boxes[0].col = color(random(50,200),B,G);
  
  for(int i = boxes.length-1; i>0;i--){
    boxes[i].size = newSize;
    boxes[i].col = boxes[i-1].col;
    newSize-=34;
    boxes[i].xPos = pressedX;
    boxes[i].yPos = pressedY;
  }
  
  boxes[0].size = 100;
  
  for(int i = boxes.length-1; i>0;i--){
    boxes[i].makeBox();
  }
  
}
​
void mousePressed(){
  pressedX = mouseX;
  pressedY = mouseY;
  B=random(50,200);
  G=random(50,200);
}
​
class Box {
  float xPos;
  float yPos;
  float size;
  color col;
  
  Box(){
    xPos = width/2;
    yPos = height/2;
    size = width/2;
    col = color(0);
  }
  
  void makeBox(){
    fill(col);
    rect(xPos,yPos,size,size);
  }
}