Gird of circles using for loops

// note: if you don't want to have the grid follow the mouse, create a variable for a point on the screen and replace Mousex and MouseY with that

void setup() {

  size(500, 500);

}

void draw() {

  background(#3B5554);

  noStroke();

  fill(#FAE605);   // make the grid yellow circles 

  // using the mouseX and mouseY as the center, draw the grid around it

  for (float x = -50; x<=50; x= x+10) {

    for (float y = -50; y<=50; y=y+10) {

      //Change the size if each circles based on how close or far it is from MouseX and MouseY, which gives it that dot matrix style effect

      float diameter = dist(mouseX, mouseY, x+mouseX, y+mouseY) / 10; // advanced

      // float diameter = 5; // basic version, all circles are the same size in this grid

      ellipse(mouseX + x, mouseY + y, diameter, diameter);

    }

  }

}