Drag and drop each shape of PGraphics

Processing Coding Questions
1

Hi, I am trying to drag and drop each square rather than the all of the squares when ‘x’ is pressed.
Do I need to include a for or while loop somewhere?

PGraphics squares;

float bx;
float by;

boolean locked = false;

float xOffset = 0.0; 
float yOffset = 0.0; 

void setup(){
  size (600, 300);
  background(0);
         
  squares = createGraphics(displayWidth, displayHeight);
}

void draw (){
  background(0);
  image(squares, bx, by);
}

void mousePressed() {
  locked = true; 
    
  xOffset = mouseX-bx; 
  yOffset = mouseY-by; 
}

void mouseDragged(){
  if(locked) {
      bx = mouseX-xOffset; 
      by = mouseY-yOffset; 
  }  
}

void mouseReleased() {
  locked = false;
}

void keyPressed (){
  if (key == 'x'){
    squares.beginDraw();
    squares.fill(160, 82, 45, random(0, 255));
    squares.noStroke();
    squares.square(random(width), random(height), random(500));
    squares.endDraw();
  }
}