windowResized()

windowResized.global.js

function windowResized() {
  const css = getComputedStyle(canvas.parentElement),
        mw = float(css.marginLeft) + float(css.marginRight),
        mh = float(css.marginTop)  + float(css.marginBottom),
        ww = float(css.width)  || windowWidth,
        wh = float(css.height) || windowHeight,
        w = round(ww - mw), h = round(wh - mh);

  resizeCanvas(w, h, true);
}

windowResized.instance.js

p.windowResized = function () {
  const css = getComputedStyle(this.canvas.parentElement),
        mw = this.float(css.marginLeft) + this.float(css.marginRight),
        mh = this.float(css.marginTop)  + this.float(css.marginBottom),
        ww = this.float(css.width)  || this.windowWidth,
        wh = this.float(css.height) || this.windowHeight,
        w = this.round(ww - mw), h = this.round(wh - mh);

  this.resizeCanvas(w, h, true);
}