pgraphics_example.pde

// renaud.jean-francois(arobas)uqam(point)ca
// Syntaxe Processing version 3.5.4
// vendredi, 23 juillet 2021

PGraphics pg; // declaration of PGraphics object

void setup() {
  size(600, 600);
  background(0);
  pg = createGraphics(200, 200); // construction of PGraphics object at it’s own size

  // PGraphics is build only once, in the setup()
  // Note that every methods is called using name of instance before : like pg.fill()
  pg.beginDraw();
  pg.noFill();
  pg.stroke(255);
  pg.strokeWeight(3);
  for (int i = 12; i <=272; i+= 20 ) { // 14 copies
    pg.circle(100, 100, i);
  }
  pg.endDraw();
}

void draw() {
  background(0);
  for (int j = 0; j<=400; j+=200) {
    for (int i = 0; i<=400; i+=200) {
      image(pg, i, j);
    }
  }
}

The reference for the PGraphics object on the Processing Web site:
PGraphics