2D grid array question

Processing Coding Questions
10

I have now converted the 1D grid to a 2D grid.

I renamed some variables so as to simplify for ease in possible future adjustments / consistency.

However, I have commented in sketch one question regarding grid shift. As it appears the 2D grid and 1D grid require different counter-solutions for the rectMode(CENTER).

The current interactivity is as desired. But my question, is this the BEST or most efficient solution? Or is there another conventional way?
Before I add any more interactivity I want to make sure all is as should be.
Thank you!!

/////////////////////////////////////////////

// 2D Grid Array of Button objects
Button [][] myButtons;

// Number of columns and rows in the grid
int num = 7;
int cols = num, rows = cols;

int r = int(random(255));
int g = int(random(255));
int b = int(random(255));

color background = color (r, g, b);

void setup() {
  size(800, 800);
  
  //int x = 40 + 50, y = x, // this 1D grid shift no longer works when 
                            // shifting 2D grid as a unit to the right + down 50 px

  myButtons = new Button[cols][rows];
  for (int i = 0; i < cols; i++) {
    for (int j = 0; j < rows; j++) {
      // Initialize each object
      myButtons[i][j] = new Button (i*(width/cols), j*(height/rows), 
        color (random(255), random(255), random(255)), // random colors
        color (random(255), random(255), random(255)), // new random colors when mouseOver
        random(50, 125)); // random sizes
    }
  }
}

void draw() {

  background(background);

  translate((width/cols)/2, (width/rows)/2); // along with pushMatrix + popMatrix, this is the only way 
                     // I could get the 2D grid to shift as a unit. And then + adjustment 
                     // in mouseOver function in Button class. Is this correct approach?
  pushMatrix();
  
  for (int i = 0; i < cols; i++) {
    for (int j = 0; j < rows; j++) {
      myButtons[i][j].mouseOver();
      myButtons[i][j].display();
    }
  }
  popMatrix();
}
void mouseClicked() { 

  background = color(random(255), random(255), random(255));
}

////////////////////////////////////////

class Button {
  float x, y;
  color colRect;
  color colRect2;

  float sz;
  boolean off = true; // button starts in OFF position

  Button ( 
    float tempX, float tempY, 
    color tempColor, color tempColor2, float tempSz) {

    x = tempX;
    y = tempY;

    colRect = tempColor;
    colRect2 = tempColor2;

    sz = tempSz;
  }

  void display() {
    if (off) {
      fill (colRect);
      noStroke();
    } else {
      fill (colRect2);
      noStroke();
    }

    rectMode(CENTER);
    rect(x, y, sz, sz);
  }

  void mouseOver() {

    if (mouseX > x - sz/2 +(width/cols)/2  && 
      mouseX < x + sz/2 +(width/cols)/2  &&
      mouseY > y - sz/2 +(width/rows)/2  &&
      mouseY < y + sz/2 +(width/rows)/2 ) {

      off = false;
    } else {
      off = true;
    }
  }
}