Scrollable image with ScrollView

Hi. I want to scroll a large image horizontally, and the code below will do the job, but not as smooth that I'm used to, on my tablet (Samsung Tab E 9.6). It flickers a bit. Is there a way to improve it or better use java ScrollView containing an image?

PGraphics img;
int imgx;
boolean dragging = false;

void setup()  {
  fullScreen();
  orientation(LANDSCAPE);
  img = createGraphics(4 * width, height);
  img.beginDraw();
  img.fill(150);
  for (float i = 200; i <= 4 * width; i += 400) {
    img.ellipse(i, 400, 400, 400);
  }
  img.endDraw();
  frameRate(1000);
}

void draw() {
  background(255);
  imgx = constrain(imgx, -img.width + width, 0); 
  set(imgx, 0, img);
  if (!mousePressed && dragging) dragging = false;
  if (dragging) imgx += -pmouseX + mouseX;
}

void mousePressed() {
    dragging = true;
}