​

function setup() {

  createCanvas(400, 400);

  stroke(0,0,200);

  //strokeWeight(0.5);

    console.log("dD "+nf(displayDensity(),1,1)+" pD "+pixelDensity());

}

​

function draw() {

  background(200,200,0);

  line(x,0,x,height);

  x+=0.1;

  if ( x > width ) x = 0.0;

}