let w = mmToPixel(100); //100mm

  let h = mmToPixel(100); //100mm

  createCanvas(w,h,SVG);

  let s = mmToPixel(80);

  rectMode(CENTER);

  noStroke();

  fill(25);

  rect(width/2,height/2,s,s);

  noLoop();

}

​

function mousePressed() {

  save();

}

​

//convert mm to pixel

//Inkscape = 96dpi

//Adobe = 72dpi

​

function mmToPixel(mm,dpi = 96) {

  let inch = mm / 25.4;

  let px = inch * dpi;

  return px;

}

​

//convert mm to device pixel

//Inkscape = 96dpi

//Adobe = 72dpi

​

function mmToDisplayPixel(mm, dpi = 96) {

  let inch = mm / 25.4;

  let px = inch * dpi * window.devicePixelRatio / pixedDensity();

  //let px = inch * adobeDPI;

  return px;

}

​